diff --git a/README.md b/README.md
index f4c7a6d63..973215c33 100644
--- a/README.md
+++ b/README.md
@@ -25,7 +25,7 @@ need to be installed:
 * The `cmtc` Course Management Tools Client CLI
 * An IDE
 
-The following sections detail how these components.
+The following sections detail how to install these components.
 
 ### Install Coursier
 
@@ -122,7 +122,7 @@ Exercises in repository:
 
 #### Verifying the course installation
 
-Verify that the the course was installed correctly by launching `sbt test` in the root folder of the
+Verify that the course was installed correctly by launching `sbt test` in the root folder of the
 course exercises. You should see the following output:
 
 ```bash
@@ -199,7 +199,7 @@ As can be seen in the above output, `cmtc` installed the course in the `/Users/e
 
 #### Verifying the course installation
 
-Verify that the the course was installed correctly by launching `sbt test` in the root folder of the
+Verify that the course was installed correctly by launching `sbt test` in the root folder of the
 course exercises. You should see the following output:
 
 ```bash
@@ -228,13 +228,13 @@ org.lunatechlabs.dotty.sudoku.ReductionRuleSuite:
   + Applying reduction rules should eliminate values in isolated complete sets from occurrences in other cells (First reduction rule) 0.045s
   + Applying reduction rules should eliminate values in isolated complete sets of 5 values from occurrences in other cells (First reduction rule) 0.001s
   + Applying reduction rules should eliminate values in 2 isolated complete sets of 3 values from occurrences in other cells (First reduction rule) 0.001s
-  + Applying reduction rules should eliminate values in shadowed complete sets from occurrences in same cells (Second reduction rule) 0.001s
-  + Applying reduction rules should eliminate values in shadowed complete (6 value) sets from occurrences in same cells (Second reduction rule) 0.001s
+  + Applying reduction rules should eliminate values in shadowed complete sets from occurrences in the same cells (Second reduction rule) 0.001s
+  + Applying reduction rules should eliminate values in shadowed complete (6 value) sets from occurrences in the same cells (Second reduction rule) 0.001s
 SLF4J: A number (1) of logging calls during the initialization phase have been intercepted and are
 SLF4J: now being replayed. These are subject to the filtering rules of the underlying logging system.
 SLF4J: See also http://www.slf4j.org/codes.html#replay
 org.lunatechlabs.dotty.sudoku.SudokuDetailProcessorSuite:
-  + Sending no updates to a sudoku detail processor should result in sending a SudokuDetailUnchanged messsage 0.007s
+  + Sending no updates to a sudoku detail processor should result in sending a SudokuDetailUnchanged message 0.007s
   + Sending an update to a fresh instance of the SudokuDetailProcessor that sets one cell to a single value should result in sending an update that reflects this update 0.002s
   + Sending a series of subsequent Updates to a SudokuDetailProcessor should result in sending updates and ultimately return no changes 0.003s
 [info] Passed: Total 11, Failed 0, Errors 0, Passed 11
diff --git a/exercises/exercise_000_sudoku_solver_initial_state/README.md b/exercises/exercise_000_sudoku_solver_initial_state/README.md
index 64ba894cc..396196947 100644
--- a/exercises/exercise_000_sudoku_solver_initial_state/README.md
+++ b/exercises/exercise_000_sudoku_solver_initial_state/README.md
@@ -55,7 +55,7 @@ SLF4J: now being replayed. These are subject to the filtering rules of the under
 SLF4J: See also http://www.slf4j.org/codes.html#replay
 [info] SudokuDetailProcessorSpec:
 [info] Sending no updates to a sudoku detail processor
-[info] - should result in sending a SudokuDetailUnchanged messsage
+[info] - should result in sending a SudokuDetailUnchanged message
 [info] Sending an update to a fresh instance of the SudokuDetailProcessor that sets one cell to a single value
 [info] - should result in sending an update that reflects this update
 [info] Sending a series of subsequent Updates to a SudokuDetailProcessor
@@ -65,8 +65,8 @@ SLF4J: See also http://www.slf4j.org/codes.html#replay
 [info] - should Eliminate values in isolated complete sets from occurrences in other cells (First reduction rule)
 [info] - should Eliminate values in isolated complete sets of 5 values from occurrences in other cells (First reduction rule)
 [info] - should Eliminate values in 2 isolated complete sets of 3 values from occurrences in other cells (First reduction rule)
-[info] - should Eliminate values in shadowed complete sets from occurrences in same cells (Second reduction rule)
-[info] - should Eliminate values in shadowed complete (6 value) sets from occurrences in same cells (Second reduction rule)
+[info] - should Eliminate values in shadowed complete sets from occurrences in the same cells (Second reduction rule)
+[info] - should Eliminate values in shadowed complete (6 value) sets from occurrences in the same cells (Second reduction rule)
 [info] CellMappingSpec:
 [info] Mapping row coordinates
 [info] - should result in correct column & block coordinates
diff --git a/exercises/exercise_000_sudoku_solver_initial_state/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala b/exercises/exercise_000_sudoku_solver_initial_state/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
index 92ebbd509..4191de216 100644
--- a/exercises/exercise_000_sudoku_solver_initial_state/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
+++ b/exercises/exercise_000_sudoku_solver_initial_state/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
@@ -128,7 +128,7 @@ class ReductionRuleSuite extends munit.FunSuite with SudokuTestHelpers {
   }
 
   test(
-    "Applying reduction rules should eliminate values in shadowed complete sets from occurrences in same cells (Second reduction rule)") {
+    "Applying reduction rules should eliminate values in shadowed complete sets from occurrences in the same cells (Second reduction rule)") {
     val input = stringToReductionSet(
       Vector(
         "12  5 789", // (1,2,7,8) shadowed & complete
@@ -160,7 +160,7 @@ class ReductionRuleSuite extends munit.FunSuite with SudokuTestHelpers {
   }
 
   test(
-    "Applying reduction rules should eliminate values in shadowed complete (6 value) sets from occurrences in same cells (Second reduction rule)") {
+    "Applying reduction rules should eliminate values in shadowed complete (6 value) sets from occurrences in the same cells (Second reduction rule)") {
     val input = stringToReductionSet(
       Vector(
         "123456 89", // (1,2,3,4,5,6) shadowed & complete
diff --git a/exercises/exercise_000_sudoku_solver_initial_state/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala b/exercises/exercise_000_sudoku_solver_initial_state/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
index 03209dfa8..b55818928 100644
--- a/exercises/exercise_000_sudoku_solver_initial_state/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
+++ b/exercises/exercise_000_sudoku_solver_initial_state/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
@@ -12,7 +12,7 @@ class SudokuDetailProcessorSuite extends munit.FunSuite with SudokuTestHelpers {
     testKit.shutdownTestKit()
   }
 
-  test("Sending no updates to a sudoku detail processor should result in sending a SudokuDetailUnchanged messsage") {
+  test("Sending no updates to a sudoku detail processor should result in sending a SudokuDetailUnchanged message") {
 
     val probe = testKit.createTestProbe[SudokuDetailProcessor.Response]()
     val detailProcessor = testKit.spawn(SudokuDetailProcessor[Row](id = 0))
diff --git a/exercises/exercise_001_dotty_deprecated_syntax_rewriting/README.md b/exercises/exercise_001_dotty_deprecated_syntax_rewriting/README.md
index 46ea6e0fe..98f739195 100644
--- a/exercises/exercise_001_dotty_deprecated_syntax_rewriting/README.md
+++ b/exercises/exercise_001_dotty_deprecated_syntax_rewriting/README.md
@@ -87,7 +87,7 @@ where possible standard options include:
               -source  source version
 ```
 
-We will add some code that trigger a number of compiler warnings which can
+We will add some code that triggers a number of compiler warnings which can
 be corrected by the compiler's code rewriting capabilities.
 
 Add the following code snippet to the `src/main/scala/org/lunatechlabs/dotty/sudoku/SudokuSolver.scala` source code file:
@@ -147,7 +147,7 @@ wildcard import syntax from using an asterix (`*`) instead of an underscore (`_`
 - Add the "-rewrite" option to have the compiler apply all the reported
   changes.
 - The end result should be that, after the compiler has applied its rewrites, the source code
-  compiles clean.
+  compiles successfully.
 - Remove the `-rewrite` from `scalacOptions` in the sbt build definition.
 - Checkpoint the current state of your code by commiting the changes to git:
 
diff --git a/exercises/exercise_001_dotty_deprecated_syntax_rewriting/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala b/exercises/exercise_001_dotty_deprecated_syntax_rewriting/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
index 92ebbd509..4191de216 100644
--- a/exercises/exercise_001_dotty_deprecated_syntax_rewriting/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
+++ b/exercises/exercise_001_dotty_deprecated_syntax_rewriting/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
@@ -128,7 +128,7 @@ class ReductionRuleSuite extends munit.FunSuite with SudokuTestHelpers {
   }
 
   test(
-    "Applying reduction rules should eliminate values in shadowed complete sets from occurrences in same cells (Second reduction rule)") {
+    "Applying reduction rules should eliminate values in shadowed complete sets from occurrences in the same cells (Second reduction rule)") {
     val input = stringToReductionSet(
       Vector(
         "12  5 789", // (1,2,7,8) shadowed & complete
@@ -160,7 +160,7 @@ class ReductionRuleSuite extends munit.FunSuite with SudokuTestHelpers {
   }
 
   test(
-    "Applying reduction rules should eliminate values in shadowed complete (6 value) sets from occurrences in same cells (Second reduction rule)") {
+    "Applying reduction rules should eliminate values in shadowed complete (6 value) sets from occurrences in the same cells (Second reduction rule)") {
     val input = stringToReductionSet(
       Vector(
         "123456 89", // (1,2,3,4,5,6) shadowed & complete
diff --git a/exercises/exercise_001_dotty_deprecated_syntax_rewriting/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala b/exercises/exercise_001_dotty_deprecated_syntax_rewriting/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
index 26362385f..c0c4cc6f7 100644
--- a/exercises/exercise_001_dotty_deprecated_syntax_rewriting/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
+++ b/exercises/exercise_001_dotty_deprecated_syntax_rewriting/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
@@ -12,7 +12,7 @@ class SudokuDetailProcessorSuite extends munit.FunSuite with SudokuTestHelpers {
     testKit.shutdownTestKit()
   }
 
-  test("Sending no updates to a sudoku detail processor should result in sending a SudokuDetailUnchanged messsage") {
+  test("Sending no updates to a sudoku detail processor should result in sending a SudokuDetailUnchanged message") {
 
     val probe = testKit.createTestProbe[SudokuDetailProcessor.Response]()
     val detailProcessor = testKit.spawn(SudokuDetailProcessor[Row](id = 0))
diff --git a/exercises/exercise_002_dotty_new_syntax_and_indentation_based_syntax/README.md b/exercises/exercise_002_dotty_new_syntax_and_indentation_based_syntax/README.md
index 6379e1455..5ee15d897 100644
--- a/exercises/exercise_002_dotty_new_syntax_and_indentation_based_syntax/README.md
+++ b/exercises/exercise_002_dotty_new_syntax_and_indentation_based_syntax/README.md
@@ -11,7 +11,7 @@ Scala 3 introduces some new syntax which can be divided in two categories:
 
 The Scala 3 compiler is able to rewrite existing source code to a different syntax.
 Note that this rewriting is done one step at a time. In other words, rewriting to 
-the new significant indentation based syntax -and- to the new control structure syntax
+the new significant indentation based syntax _and_ to the new control structure syntax
 cannot be done in a single step.
 
 Changing the syntax is a reversible process (except that after going back to where
@@ -42,7 +42,7 @@ alternative syntax options.
   for a specific syntax rewrite.
 - Note that syntax rewrites have to be executed one at a time. Also, consecutive
   syntax rewrites have to be executed in a certain order. Make sure you understand
-  what's explained in the section named `Setting and Rewrites` at the end of the
+  what's explained in the section named `Settings and Rewrites` at the end of the
   [Optional Braces](https://dotty.epfl.ch/docs/reference/other-new-features/indentation.html)
   section in the Scala 3 reference documentation.
 
diff --git a/exercises/exercise_002_dotty_new_syntax_and_indentation_based_syntax/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala b/exercises/exercise_002_dotty_new_syntax_and_indentation_based_syntax/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
index afc7cf290..ea6d89ec4 100644
--- a/exercises/exercise_002_dotty_new_syntax_and_indentation_based_syntax/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
+++ b/exercises/exercise_002_dotty_new_syntax_and_indentation_based_syntax/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
@@ -124,7 +124,7 @@ class ReductionRuleSuite extends munit.FunSuite with SudokuTestHelpers:
       assertEquals(applyReductionRules(input), reducedInput)
 
   test(
-    "Applying reduction rules should eliminate values in shadowed complete sets from occurrences in same cells (Second reduction rule)"):
+    "Applying reduction rules should eliminate values in shadowed complete sets from occurrences in the same cells (Second reduction rule)"):
       val input = stringToReductionSet(
         Vector(
           "12  5 789", // (1,2,7,8) shadowed & complete
@@ -155,7 +155,7 @@ class ReductionRuleSuite extends munit.FunSuite with SudokuTestHelpers:
       assertEquals(applyReductionRules(reducedInput1), reducedInput1)
 
   test(
-    "Applying reduction rules should eliminate values in shadowed complete (6 value) sets from occurrences in same cells (Second reduction rule)"):
+    "Applying reduction rules should eliminate values in shadowed complete (6 value) sets from occurrences in the same cells (Second reduction rule)"):
       val input = stringToReductionSet(
         Vector(
           "123456 89", // (1,2,3,4,5,6) shadowed & complete
diff --git a/exercises/exercise_002_dotty_new_syntax_and_indentation_based_syntax/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala b/exercises/exercise_002_dotty_new_syntax_and_indentation_based_syntax/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
index 7414e902a..b1fe3cacc 100644
--- a/exercises/exercise_002_dotty_new_syntax_and_indentation_based_syntax/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
+++ b/exercises/exercise_002_dotty_new_syntax_and_indentation_based_syntax/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
@@ -11,7 +11,7 @@ class SudokuDetailProcessorSuite extends munit.FunSuite with SudokuTestHelpers:
   override def afterAll(): Unit =
     testKit.shutdownTestKit()
 
-  test("Sending no updates to a sudoku detail processor should result in sending a SudokuDetailUnchanged messsage"):
+  test("Sending no updates to a sudoku detail processor should result in sending a SudokuDetailUnchanged message"):
 
       val probe = testKit.createTestProbe[SudokuDetailProcessor.Response]()
       val detailProcessor = testKit.spawn(SudokuDetailProcessor[Row](id = 0))
diff --git a/exercises/exercise_003_top_level_definitions/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala b/exercises/exercise_003_top_level_definitions/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
index afc7cf290..ea6d89ec4 100644
--- a/exercises/exercise_003_top_level_definitions/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
+++ b/exercises/exercise_003_top_level_definitions/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
@@ -124,7 +124,7 @@ class ReductionRuleSuite extends munit.FunSuite with SudokuTestHelpers:
       assertEquals(applyReductionRules(input), reducedInput)
 
   test(
-    "Applying reduction rules should eliminate values in shadowed complete sets from occurrences in same cells (Second reduction rule)"):
+    "Applying reduction rules should eliminate values in shadowed complete sets from occurrences in the same cells (Second reduction rule)"):
       val input = stringToReductionSet(
         Vector(
           "12  5 789", // (1,2,7,8) shadowed & complete
@@ -155,7 +155,7 @@ class ReductionRuleSuite extends munit.FunSuite with SudokuTestHelpers:
       assertEquals(applyReductionRules(reducedInput1), reducedInput1)
 
   test(
-    "Applying reduction rules should eliminate values in shadowed complete (6 value) sets from occurrences in same cells (Second reduction rule)"):
+    "Applying reduction rules should eliminate values in shadowed complete (6 value) sets from occurrences in the same cells (Second reduction rule)"):
       val input = stringToReductionSet(
         Vector(
           "123456 89", // (1,2,3,4,5,6) shadowed & complete
diff --git a/exercises/exercise_003_top_level_definitions/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala b/exercises/exercise_003_top_level_definitions/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
index 7414e902a..b1fe3cacc 100644
--- a/exercises/exercise_003_top_level_definitions/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
+++ b/exercises/exercise_003_top_level_definitions/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
@@ -11,7 +11,7 @@ class SudokuDetailProcessorSuite extends munit.FunSuite with SudokuTestHelpers:
   override def afterAll(): Unit =
     testKit.shutdownTestKit()
 
-  test("Sending no updates to a sudoku detail processor should result in sending a SudokuDetailUnchanged messsage"):
+  test("Sending no updates to a sudoku detail processor should result in sending a SudokuDetailUnchanged message"):
 
       val probe = testKit.createTestProbe[SudokuDetailProcessor.Response]()
       val detailProcessor = testKit.spawn(SudokuDetailProcessor[Row](id = 0))
diff --git a/exercises/exercise_004_parameter_untupling/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala b/exercises/exercise_004_parameter_untupling/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
index afc7cf290..ea6d89ec4 100644
--- a/exercises/exercise_004_parameter_untupling/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
+++ b/exercises/exercise_004_parameter_untupling/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
@@ -124,7 +124,7 @@ class ReductionRuleSuite extends munit.FunSuite with SudokuTestHelpers:
       assertEquals(applyReductionRules(input), reducedInput)
 
   test(
-    "Applying reduction rules should eliminate values in shadowed complete sets from occurrences in same cells (Second reduction rule)"):
+    "Applying reduction rules should eliminate values in shadowed complete sets from occurrences in the same cells (Second reduction rule)"):
       val input = stringToReductionSet(
         Vector(
           "12  5 789", // (1,2,7,8) shadowed & complete
@@ -155,7 +155,7 @@ class ReductionRuleSuite extends munit.FunSuite with SudokuTestHelpers:
       assertEquals(applyReductionRules(reducedInput1), reducedInput1)
 
   test(
-    "Applying reduction rules should eliminate values in shadowed complete (6 value) sets from occurrences in same cells (Second reduction rule)"):
+    "Applying reduction rules should eliminate values in shadowed complete (6 value) sets from occurrences in the same cells (Second reduction rule)"):
       val input = stringToReductionSet(
         Vector(
           "123456 89", // (1,2,3,4,5,6) shadowed & complete
diff --git a/exercises/exercise_004_parameter_untupling/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala b/exercises/exercise_004_parameter_untupling/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
index 7414e902a..b1fe3cacc 100644
--- a/exercises/exercise_004_parameter_untupling/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
+++ b/exercises/exercise_004_parameter_untupling/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
@@ -11,7 +11,7 @@ class SudokuDetailProcessorSuite extends munit.FunSuite with SudokuTestHelpers:
   override def afterAll(): Unit =
     testKit.shutdownTestKit()
 
-  test("Sending no updates to a sudoku detail processor should result in sending a SudokuDetailUnchanged messsage"):
+  test("Sending no updates to a sudoku detail processor should result in sending a SudokuDetailUnchanged message"):
 
       val probe = testKit.createTestProbe[SudokuDetailProcessor.Response]()
       val detailProcessor = testKit.spawn(SudokuDetailProcessor[Row](id = 0))
diff --git a/exercises/exercise_005_extension_methods/README.md b/exercises/exercise_005_extension_methods/README.md
index 3fb88388a..0017c9b1a 100644
--- a/exercises/exercise_005_extension_methods/README.md
+++ b/exercises/exercise_005_extension_methods/README.md
@@ -45,10 +45,10 @@ extension (i: Int)
 ## Steps - part I
 
 You should look for extension methods defined with the Scala 2 syntax. How would
-you approach this. As part of the exercise, you will define a few new extension
+you approach this? As part of the exercise, you will define a few new extension
 methods. In fact, for this exercise, the tests have been modified assuming these
 new extension methods are already present. Let's start with adapting the existing
-extension methods. Wait with running the tests until you start tackling the second
+extension methods. Hold running the tests until you start tackling the second
 part of this exercise (adding the new extension methods).
 
 - Identify all extension methods defined using the _Scala 2 way_.
diff --git a/exercises/exercise_005_extension_methods/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala b/exercises/exercise_005_extension_methods/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
index afc7cf290..ea6d89ec4 100644
--- a/exercises/exercise_005_extension_methods/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
+++ b/exercises/exercise_005_extension_methods/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
@@ -124,7 +124,7 @@ class ReductionRuleSuite extends munit.FunSuite with SudokuTestHelpers:
       assertEquals(applyReductionRules(input), reducedInput)
 
   test(
-    "Applying reduction rules should eliminate values in shadowed complete sets from occurrences in same cells (Second reduction rule)"):
+    "Applying reduction rules should eliminate values in shadowed complete sets from occurrences in the same cells (Second reduction rule)"):
       val input = stringToReductionSet(
         Vector(
           "12  5 789", // (1,2,7,8) shadowed & complete
@@ -155,7 +155,7 @@ class ReductionRuleSuite extends munit.FunSuite with SudokuTestHelpers:
       assertEquals(applyReductionRules(reducedInput1), reducedInput1)
 
   test(
-    "Applying reduction rules should eliminate values in shadowed complete (6 value) sets from occurrences in same cells (Second reduction rule)"):
+    "Applying reduction rules should eliminate values in shadowed complete (6 value) sets from occurrences in the same cells (Second reduction rule)"):
       val input = stringToReductionSet(
         Vector(
           "123456 89", // (1,2,3,4,5,6) shadowed & complete
diff --git a/exercises/exercise_005_extension_methods/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala b/exercises/exercise_005_extension_methods/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
index 7414e902a..b1fe3cacc 100644
--- a/exercises/exercise_005_extension_methods/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
+++ b/exercises/exercise_005_extension_methods/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
@@ -11,7 +11,7 @@ class SudokuDetailProcessorSuite extends munit.FunSuite with SudokuTestHelpers:
   override def afterAll(): Unit =
     testKit.shutdownTestKit()
 
-  test("Sending no updates to a sudoku detail processor should result in sending a SudokuDetailUnchanged messsage"):
+  test("Sending no updates to a sudoku detail processor should result in sending a SudokuDetailUnchanged message"):
 
       val probe = testKit.createTestProbe[SudokuDetailProcessor.Response]()
       val detailProcessor = testKit.spawn(SudokuDetailProcessor[Row](id = 0))
diff --git a/exercises/exercise_006_using_and_summon/README.md b/exercises/exercise_006_using_and_summon/README.md
index 9a7d8f92f..36e1427f9 100644
--- a/exercises/exercise_006_using_and_summon/README.md
+++ b/exercises/exercise_006_using_and_summon/README.md
@@ -19,7 +19,7 @@ use of _scala 2_'s `implicit`s and `implicitly`.
 > `Tip`: When a context parameter is passed explicitly it must be preceded by
 >  the `using` keyword
 
-- Keep the `implicit`s at definition side for now, we can change them in  the 
+- Keep the `implicit`s at definition side for now, we can change them in the 
   next exercise
 
 - Replace all occurrences of `implicitly` with `summon`
diff --git a/exercises/exercise_006_using_and_summon/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala b/exercises/exercise_006_using_and_summon/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
index afc7cf290..ea6d89ec4 100644
--- a/exercises/exercise_006_using_and_summon/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
+++ b/exercises/exercise_006_using_and_summon/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
@@ -124,7 +124,7 @@ class ReductionRuleSuite extends munit.FunSuite with SudokuTestHelpers:
       assertEquals(applyReductionRules(input), reducedInput)
 
   test(
-    "Applying reduction rules should eliminate values in shadowed complete sets from occurrences in same cells (Second reduction rule)"):
+    "Applying reduction rules should eliminate values in shadowed complete sets from occurrences in the same cells (Second reduction rule)"):
       val input = stringToReductionSet(
         Vector(
           "12  5 789", // (1,2,7,8) shadowed & complete
@@ -155,7 +155,7 @@ class ReductionRuleSuite extends munit.FunSuite with SudokuTestHelpers:
       assertEquals(applyReductionRules(reducedInput1), reducedInput1)
 
   test(
-    "Applying reduction rules should eliminate values in shadowed complete (6 value) sets from occurrences in same cells (Second reduction rule)"):
+    "Applying reduction rules should eliminate values in shadowed complete (6 value) sets from occurrences in the same cells (Second reduction rule)"):
       val input = stringToReductionSet(
         Vector(
           "123456 89", // (1,2,3,4,5,6) shadowed & complete
diff --git a/exercises/exercise_006_using_and_summon/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala b/exercises/exercise_006_using_and_summon/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
index 7414e902a..b1fe3cacc 100644
--- a/exercises/exercise_006_using_and_summon/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
+++ b/exercises/exercise_006_using_and_summon/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
@@ -11,7 +11,7 @@ class SudokuDetailProcessorSuite extends munit.FunSuite with SudokuTestHelpers:
   override def afterAll(): Unit =
     testKit.shutdownTestKit()
 
-  test("Sending no updates to a sudoku detail processor should result in sending a SudokuDetailUnchanged messsage"):
+  test("Sending no updates to a sudoku detail processor should result in sending a SudokuDetailUnchanged message"):
 
       val probe = testKit.createTestProbe[SudokuDetailProcessor.Response]()
       val detailProcessor = testKit.spawn(SudokuDetailProcessor[Row](id = 0))
diff --git a/exercises/exercise_007_givens/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala b/exercises/exercise_007_givens/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
index afc7cf290..ea6d89ec4 100644
--- a/exercises/exercise_007_givens/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
+++ b/exercises/exercise_007_givens/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
@@ -124,7 +124,7 @@ class ReductionRuleSuite extends munit.FunSuite with SudokuTestHelpers:
       assertEquals(applyReductionRules(input), reducedInput)
 
   test(
-    "Applying reduction rules should eliminate values in shadowed complete sets from occurrences in same cells (Second reduction rule)"):
+    "Applying reduction rules should eliminate values in shadowed complete sets from occurrences in the same cells (Second reduction rule)"):
       val input = stringToReductionSet(
         Vector(
           "12  5 789", // (1,2,7,8) shadowed & complete
@@ -155,7 +155,7 @@ class ReductionRuleSuite extends munit.FunSuite with SudokuTestHelpers:
       assertEquals(applyReductionRules(reducedInput1), reducedInput1)
 
   test(
-    "Applying reduction rules should eliminate values in shadowed complete (6 value) sets from occurrences in same cells (Second reduction rule)"):
+    "Applying reduction rules should eliminate values in shadowed complete (6 value) sets from occurrences in the same cells (Second reduction rule)"):
       val input = stringToReductionSet(
         Vector(
           "123456 89", // (1,2,3,4,5,6) shadowed & complete
diff --git a/exercises/exercise_007_givens/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala b/exercises/exercise_007_givens/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
index 7414e902a..b1fe3cacc 100644
--- a/exercises/exercise_007_givens/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
+++ b/exercises/exercise_007_givens/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
@@ -11,7 +11,7 @@ class SudokuDetailProcessorSuite extends munit.FunSuite with SudokuTestHelpers:
   override def afterAll(): Unit =
     testKit.shutdownTestKit()
 
-  test("Sending no updates to a sudoku detail processor should result in sending a SudokuDetailUnchanged messsage"):
+  test("Sending no updates to a sudoku detail processor should result in sending a SudokuDetailUnchanged message"):
 
       val probe = testKit.createTestProbe[SudokuDetailProcessor.Response]()
       val detailProcessor = testKit.spawn(SudokuDetailProcessor[Row](id = 0))
diff --git a/exercises/exercise_008_enum_and_export/README.md b/exercises/exercise_008_enum_and_export/README.md
index 876bc4fe8..805cb9381 100644
--- a/exercises/exercise_008_enum_and_export/README.md
+++ b/exercises/exercise_008_enum_and_export/README.md
@@ -3,7 +3,7 @@
 ## Background
 
 The Sudoku solver is an `Akka Typed` based application. It consists of 29 actors
-that interact by exchanging messages and adhering to a well defined protocol,
+that interact by exchanging messages and adhering to a well-defined protocol,
 i.e. each actor has a number of message types it 'understands', the so-called
 `Command`s and a number of messages that it can send to other actors, usually in
 `Response` to messages it received earlier.
diff --git a/exercises/exercise_008_enum_and_export/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala b/exercises/exercise_008_enum_and_export/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
index afc7cf290..ea6d89ec4 100644
--- a/exercises/exercise_008_enum_and_export/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
+++ b/exercises/exercise_008_enum_and_export/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
@@ -124,7 +124,7 @@ class ReductionRuleSuite extends munit.FunSuite with SudokuTestHelpers:
       assertEquals(applyReductionRules(input), reducedInput)
 
   test(
-    "Applying reduction rules should eliminate values in shadowed complete sets from occurrences in same cells (Second reduction rule)"):
+    "Applying reduction rules should eliminate values in shadowed complete sets from occurrences in the same cells (Second reduction rule)"):
       val input = stringToReductionSet(
         Vector(
           "12  5 789", // (1,2,7,8) shadowed & complete
@@ -155,7 +155,7 @@ class ReductionRuleSuite extends munit.FunSuite with SudokuTestHelpers:
       assertEquals(applyReductionRules(reducedInput1), reducedInput1)
 
   test(
-    "Applying reduction rules should eliminate values in shadowed complete (6 value) sets from occurrences in same cells (Second reduction rule)"):
+    "Applying reduction rules should eliminate values in shadowed complete (6 value) sets from occurrences in the same cells (Second reduction rule)"):
       val input = stringToReductionSet(
         Vector(
           "123456 89", // (1,2,3,4,5,6) shadowed & complete
diff --git a/exercises/exercise_008_enum_and_export/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala b/exercises/exercise_008_enum_and_export/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
index 7414e902a..b1fe3cacc 100644
--- a/exercises/exercise_008_enum_and_export/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
+++ b/exercises/exercise_008_enum_and_export/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
@@ -11,7 +11,7 @@ class SudokuDetailProcessorSuite extends munit.FunSuite with SudokuTestHelpers:
   override def afterAll(): Unit =
     testKit.shutdownTestKit()
 
-  test("Sending no updates to a sudoku detail processor should result in sending a SudokuDetailUnchanged messsage"):
+  test("Sending no updates to a sudoku detail processor should result in sending a SudokuDetailUnchanged message"):
 
       val probe = testKit.createTestProbe[SudokuDetailProcessor.Response]()
       val detailProcessor = testKit.spawn(SudokuDetailProcessor[Row](id = 0))
diff --git a/exercises/exercise_009_union_types/README.md b/exercises/exercise_009_union_types/README.md
index cea477f47..d60d47403 100644
--- a/exercises/exercise_009_union_types/README.md
+++ b/exercises/exercise_009_union_types/README.md
@@ -37,8 +37,8 @@ Which of these actors receive messages that are responses from other actors?
   actor's external protocol (`Command`) and the `Response` message types.
   This new type will be the type of the internal protocol.
 
-- Adapt the `apply` method that creates the actor's behaviour so that it
-  still is the original behaviour as seen from the outside, but which
+- Adapt the `apply` method that creates the actor's behaviour in a way that
+  keeps the original behaviour as seen from the outside, but which
   has the extended behaviour (corresponding to `CommandAndResponses`).
   You will need to make a few extra modifications to make everything
   type check. Some hints that may put you on the right track:
@@ -62,7 +62,7 @@ Which of these actors receive messages that are responses from other actors?
   and verify that all tests pass
 
 - Let's take a step back to see what we achieved:
-  - We have removed a lot boilerplate code which improves code reablility
+  - We have removed a lot boilerplate code which improves code readability
     tremendously.
   - We have solved the issue of widening some of the actor's protocol
     in the previous exercise for pure technical reasons.
diff --git a/exercises/exercise_009_union_types/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala b/exercises/exercise_009_union_types/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
index afc7cf290..ea6d89ec4 100644
--- a/exercises/exercise_009_union_types/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
+++ b/exercises/exercise_009_union_types/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
@@ -124,7 +124,7 @@ class ReductionRuleSuite extends munit.FunSuite with SudokuTestHelpers:
       assertEquals(applyReductionRules(input), reducedInput)
 
   test(
-    "Applying reduction rules should eliminate values in shadowed complete sets from occurrences in same cells (Second reduction rule)"):
+    "Applying reduction rules should eliminate values in shadowed complete sets from occurrences in the same cells (Second reduction rule)"):
       val input = stringToReductionSet(
         Vector(
           "12  5 789", // (1,2,7,8) shadowed & complete
@@ -155,7 +155,7 @@ class ReductionRuleSuite extends munit.FunSuite with SudokuTestHelpers:
       assertEquals(applyReductionRules(reducedInput1), reducedInput1)
 
   test(
-    "Applying reduction rules should eliminate values in shadowed complete (6 value) sets from occurrences in same cells (Second reduction rule)"):
+    "Applying reduction rules should eliminate values in shadowed complete (6 value) sets from occurrences in the same cells (Second reduction rule)"):
       val input = stringToReductionSet(
         Vector(
           "123456 89", // (1,2,3,4,5,6) shadowed & complete
diff --git a/exercises/exercise_009_union_types/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala b/exercises/exercise_009_union_types/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
index 7414e902a..b1fe3cacc 100644
--- a/exercises/exercise_009_union_types/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
+++ b/exercises/exercise_009_union_types/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
@@ -11,7 +11,7 @@ class SudokuDetailProcessorSuite extends munit.FunSuite with SudokuTestHelpers:
   override def afterAll(): Unit =
     testKit.shutdownTestKit()
 
-  test("Sending no updates to a sudoku detail processor should result in sending a SudokuDetailUnchanged messsage"):
+  test("Sending no updates to a sudoku detail processor should result in sending a SudokuDetailUnchanged message"):
 
       val probe = testKit.createTestProbe[SudokuDetailProcessor.Response]()
       val detailProcessor = testKit.spawn(SudokuDetailProcessor[Row](id = 0))
diff --git a/exercises/exercise_010_exploring_opaque_type_aliases/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala b/exercises/exercise_010_exploring_opaque_type_aliases/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
index afc7cf290..ea6d89ec4 100644
--- a/exercises/exercise_010_exploring_opaque_type_aliases/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
+++ b/exercises/exercise_010_exploring_opaque_type_aliases/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
@@ -124,7 +124,7 @@ class ReductionRuleSuite extends munit.FunSuite with SudokuTestHelpers:
       assertEquals(applyReductionRules(input), reducedInput)
 
   test(
-    "Applying reduction rules should eliminate values in shadowed complete sets from occurrences in same cells (Second reduction rule)"):
+    "Applying reduction rules should eliminate values in shadowed complete sets from occurrences in the same cells (Second reduction rule)"):
       val input = stringToReductionSet(
         Vector(
           "12  5 789", // (1,2,7,8) shadowed & complete
@@ -155,7 +155,7 @@ class ReductionRuleSuite extends munit.FunSuite with SudokuTestHelpers:
       assertEquals(applyReductionRules(reducedInput1), reducedInput1)
 
   test(
-    "Applying reduction rules should eliminate values in shadowed complete (6 value) sets from occurrences in same cells (Second reduction rule)"):
+    "Applying reduction rules should eliminate values in shadowed complete (6 value) sets from occurrences in the same cells (Second reduction rule)"):
       val input = stringToReductionSet(
         Vector(
           "123456 89", // (1,2,3,4,5,6) shadowed & complete
diff --git a/exercises/exercise_010_exploring_opaque_type_aliases/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala b/exercises/exercise_010_exploring_opaque_type_aliases/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
index 7414e902a..b1fe3cacc 100644
--- a/exercises/exercise_010_exploring_opaque_type_aliases/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
+++ b/exercises/exercise_010_exploring_opaque_type_aliases/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
@@ -11,7 +11,7 @@ class SudokuDetailProcessorSuite extends munit.FunSuite with SudokuTestHelpers:
   override def afterAll(): Unit =
     testKit.shutdownTestKit()
 
-  test("Sending no updates to a sudoku detail processor should result in sending a SudokuDetailUnchanged messsage"):
+  test("Sending no updates to a sudoku detail processor should result in sending a SudokuDetailUnchanged message"):
 
       val probe = testKit.createTestProbe[SudokuDetailProcessor.Response]()
       val detailProcessor = testKit.spawn(SudokuDetailProcessor[Row](id = 0))
diff --git a/exercises/exercise_011_optional_opaque_type_aliases/README.md b/exercises/exercise_011_optional_opaque_type_aliases/README.md
index 99a075b61..0f408914a 100644
--- a/exercises/exercise_011_optional_opaque_type_aliases/README.md
+++ b/exercises/exercise_011_optional_opaque_type_aliases/README.md
@@ -1,6 +1,6 @@
 # Opaque Type Aliases
 
-> NOTE: this exercise is optional. It's purpose is to show that certain use
+> NOTE: this exercise is optional. Its purpose is to show that certain use
 >       cases of opaque type aliases sound great at first, but turn out
 >       to be very difficult to implement
 
@@ -46,7 +46,7 @@ into an Opaque Type Alias.
 - So it seems we need to tackle quite a few compilation errors... Let's get
   started.
 
-> Tip: In general, try to fix all of the compilation errors of this form
+> Tip: In general, try to fix all the compilation errors of this form
 >      `value {name} is not a member of ...` before tackling the other types
 >      of error like `Found: ... Required: ...`
 
diff --git a/exercises/exercise_011_optional_opaque_type_aliases/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala b/exercises/exercise_011_optional_opaque_type_aliases/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
index afc7cf290..ea6d89ec4 100644
--- a/exercises/exercise_011_optional_opaque_type_aliases/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
+++ b/exercises/exercise_011_optional_opaque_type_aliases/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
@@ -124,7 +124,7 @@ class ReductionRuleSuite extends munit.FunSuite with SudokuTestHelpers:
       assertEquals(applyReductionRules(input), reducedInput)
 
   test(
-    "Applying reduction rules should eliminate values in shadowed complete sets from occurrences in same cells (Second reduction rule)"):
+    "Applying reduction rules should eliminate values in shadowed complete sets from occurrences in the same cells (Second reduction rule)"):
       val input = stringToReductionSet(
         Vector(
           "12  5 789", // (1,2,7,8) shadowed & complete
@@ -155,7 +155,7 @@ class ReductionRuleSuite extends munit.FunSuite with SudokuTestHelpers:
       assertEquals(applyReductionRules(reducedInput1), reducedInput1)
 
   test(
-    "Applying reduction rules should eliminate values in shadowed complete (6 value) sets from occurrences in same cells (Second reduction rule)"):
+    "Applying reduction rules should eliminate values in shadowed complete (6 value) sets from occurrences in the same cells (Second reduction rule)"):
       val input = stringToReductionSet(
         Vector(
           "123456 89", // (1,2,3,4,5,6) shadowed & complete
diff --git a/exercises/exercise_011_optional_opaque_type_aliases/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala b/exercises/exercise_011_optional_opaque_type_aliases/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
index 7414e902a..b1fe3cacc 100644
--- a/exercises/exercise_011_optional_opaque_type_aliases/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
+++ b/exercises/exercise_011_optional_opaque_type_aliases/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
@@ -11,7 +11,7 @@ class SudokuDetailProcessorSuite extends munit.FunSuite with SudokuTestHelpers:
   override def afterAll(): Unit =
     testKit.shutdownTestKit()
 
-  test("Sending no updates to a sudoku detail processor should result in sending a SudokuDetailUnchanged messsage"):
+  test("Sending no updates to a sudoku detail processor should result in sending a SudokuDetailUnchanged message"):
 
       val probe = testKit.createTestProbe[SudokuDetailProcessor.Response]()
       val detailProcessor = testKit.spawn(SudokuDetailProcessor[Row](id = 0))
diff --git a/exercises/exercise_012_multiversal_equality/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala b/exercises/exercise_012_multiversal_equality/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
index afc7cf290..ea6d89ec4 100644
--- a/exercises/exercise_012_multiversal_equality/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
+++ b/exercises/exercise_012_multiversal_equality/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
@@ -124,7 +124,7 @@ class ReductionRuleSuite extends munit.FunSuite with SudokuTestHelpers:
       assertEquals(applyReductionRules(input), reducedInput)
 
   test(
-    "Applying reduction rules should eliminate values in shadowed complete sets from occurrences in same cells (Second reduction rule)"):
+    "Applying reduction rules should eliminate values in shadowed complete sets from occurrences in the same cells (Second reduction rule)"):
       val input = stringToReductionSet(
         Vector(
           "12  5 789", // (1,2,7,8) shadowed & complete
@@ -155,7 +155,7 @@ class ReductionRuleSuite extends munit.FunSuite with SudokuTestHelpers:
       assertEquals(applyReductionRules(reducedInput1), reducedInput1)
 
   test(
-    "Applying reduction rules should eliminate values in shadowed complete (6 value) sets from occurrences in same cells (Second reduction rule)"):
+    "Applying reduction rules should eliminate values in shadowed complete (6 value) sets from occurrences in the same cells (Second reduction rule)"):
       val input = stringToReductionSet(
         Vector(
           "123456 89", // (1,2,3,4,5,6) shadowed & complete
diff --git a/exercises/exercise_012_multiversal_equality/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala b/exercises/exercise_012_multiversal_equality/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
index 7414e902a..b1fe3cacc 100644
--- a/exercises/exercise_012_multiversal_equality/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
+++ b/exercises/exercise_012_multiversal_equality/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
@@ -11,7 +11,7 @@ class SudokuDetailProcessorSuite extends munit.FunSuite with SudokuTestHelpers:
   override def afterAll(): Unit =
     testKit.shutdownTestKit()
 
-  test("Sending no updates to a sudoku detail processor should result in sending a SudokuDetailUnchanged messsage"):
+  test("Sending no updates to a sudoku detail processor should result in sending a SudokuDetailUnchanged message"):
 
       val probe = testKit.createTestProbe[SudokuDetailProcessor.Response]()
       val detailProcessor = testKit.spawn(SudokuDetailProcessor[Row](id = 0))
diff --git a/exercises/exercise_020_opaque_type_aliases_alt/README.md b/exercises/exercise_020_opaque_type_aliases_alt/README.md
index 77faab5f2..e4397564f 100644
--- a/exercises/exercise_020_opaque_type_aliases_alt/README.md
+++ b/exercises/exercise_020_opaque_type_aliases_alt/README.md
@@ -1,6 +1,6 @@
 # Opaque Type Aliases
 
-> NOTE: this exercise is optional. It's purpose is to show that certain use
+> NOTE: this exercise is optional. Its purpose is to show that certain use
 >       cases of opaque type aliases sound great at first, but turn out
 >       to be very difficult to implement
 
@@ -12,7 +12,7 @@ any runtime overhead. The aim is to provide additional type-safety at
 compile-time but then be stripped away at runtime. It is a powerful new feature
 of Scala 3 for supporting Information Hiding.
 
-Opaque Type Aliases differ from plain Scala 2 Type Aliases in that the later
+Opaque Type Aliases differ from plain Scala 2 Type Aliases in that the latter
 just provide a new name for a type but wherever this new name is used, the
 call-site still knows the details of the original type being aliased. With
 Opaque Type Aliases, the original type being aliased is hidden (or is opaque) at
@@ -45,7 +45,7 @@ this exercise. Specifically we will convert the last of these type aliases,
 - Use your experience from the exercise on Extension Methods to fix the
   compilation errors of the form `value {name} is not a member of
   org.lunatechlabs.dotty.sudoku.CellUpdates`
-    - Tip: Fix all of the compilation errors of this form `value {name} is not a
+    - Tip: Fix all the compilation errors of this form `value {name} is not a
       member of ...` before tackling the other types of error like `Found: ...
       Required: ...`
     - Tip: Some of the mission members for our new opaque type are generic (i.e.
diff --git a/exercises/exercise_020_opaque_type_aliases_alt/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala b/exercises/exercise_020_opaque_type_aliases_alt/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
index afc7cf290..ea6d89ec4 100644
--- a/exercises/exercise_020_opaque_type_aliases_alt/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
+++ b/exercises/exercise_020_opaque_type_aliases_alt/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
@@ -124,7 +124,7 @@ class ReductionRuleSuite extends munit.FunSuite with SudokuTestHelpers:
       assertEquals(applyReductionRules(input), reducedInput)
 
   test(
-    "Applying reduction rules should eliminate values in shadowed complete sets from occurrences in same cells (Second reduction rule)"):
+    "Applying reduction rules should eliminate values in shadowed complete sets from occurrences in the same cells (Second reduction rule)"):
       val input = stringToReductionSet(
         Vector(
           "12  5 789", // (1,2,7,8) shadowed & complete
@@ -155,7 +155,7 @@ class ReductionRuleSuite extends munit.FunSuite with SudokuTestHelpers:
       assertEquals(applyReductionRules(reducedInput1), reducedInput1)
 
   test(
-    "Applying reduction rules should eliminate values in shadowed complete (6 value) sets from occurrences in same cells (Second reduction rule)"):
+    "Applying reduction rules should eliminate values in shadowed complete (6 value) sets from occurrences in the same cells (Second reduction rule)"):
       val input = stringToReductionSet(
         Vector(
           "123456 89", // (1,2,3,4,5,6) shadowed & complete
diff --git a/exercises/exercise_020_opaque_type_aliases_alt/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala b/exercises/exercise_020_opaque_type_aliases_alt/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
index a61822435..891c7fbd9 100644
--- a/exercises/exercise_020_opaque_type_aliases_alt/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
+++ b/exercises/exercise_020_opaque_type_aliases_alt/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
@@ -11,7 +11,7 @@ class SudokuDetailProcessorSuite extends munit.FunSuite with SudokuTestHelpers:
   override def afterAll(): Unit =
     testKit.shutdownTestKit()
 
-  test("Sending no updates to a sudoku detail processor should result in sending a SudokuDetailUnchanged messsage"):
+  test("Sending no updates to a sudoku detail processor should result in sending a SudokuDetailUnchanged message"):
 
       val probe = testKit.createTestProbe[SudokuDetailProcessor.Response]()
       val detailProcessor = testKit.spawn(SudokuDetailProcessor[Row](id = 0))
diff --git a/exercises/exercise_021_multiversal_equality/README.md b/exercises/exercise_021_multiversal_equality/README.md
index 17675575b..e22c97e8c 100644
--- a/exercises/exercise_021_multiversal_equality/README.md
+++ b/exercises/exercise_021_multiversal_equality/README.md
@@ -28,7 +28,7 @@ error.
 ## Steps
 
 - Enable multiversal equality at the project level by adding `-language:strictEquality`
-  to the Scalaa compiler options in `project/Build.scala`
+  to the Scala compiler options in `project/Build.scala`
 
 - Use the course notes on Multiversal Equality and your experience from the
   exercise on `given`s to make the code compile with the flag
diff --git a/exercises/exercise_021_multiversal_equality/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala b/exercises/exercise_021_multiversal_equality/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
index afc7cf290..ea6d89ec4 100644
--- a/exercises/exercise_021_multiversal_equality/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
+++ b/exercises/exercise_021_multiversal_equality/src/test/scala/org/lunatechlabs/dotty/sudoku/ReductionRuleSuite.scala
@@ -124,7 +124,7 @@ class ReductionRuleSuite extends munit.FunSuite with SudokuTestHelpers:
       assertEquals(applyReductionRules(input), reducedInput)
 
   test(
-    "Applying reduction rules should eliminate values in shadowed complete sets from occurrences in same cells (Second reduction rule)"):
+    "Applying reduction rules should eliminate values in shadowed complete sets from occurrences in the same cells (Second reduction rule)"):
       val input = stringToReductionSet(
         Vector(
           "12  5 789", // (1,2,7,8) shadowed & complete
@@ -155,7 +155,7 @@ class ReductionRuleSuite extends munit.FunSuite with SudokuTestHelpers:
       assertEquals(applyReductionRules(reducedInput1), reducedInput1)
 
   test(
-    "Applying reduction rules should eliminate values in shadowed complete (6 value) sets from occurrences in same cells (Second reduction rule)"):
+    "Applying reduction rules should eliminate values in shadowed complete (6 value) sets from occurrences in the same cells (Second reduction rule)"):
       val input = stringToReductionSet(
         Vector(
           "123456 89", // (1,2,3,4,5,6) shadowed & complete
diff --git a/exercises/exercise_021_multiversal_equality/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala b/exercises/exercise_021_multiversal_equality/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
index a61822435..891c7fbd9 100644
--- a/exercises/exercise_021_multiversal_equality/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
+++ b/exercises/exercise_021_multiversal_equality/src/test/scala/org/lunatechlabs/dotty/sudoku/SudokuDetailProcessorSuite.scala
@@ -11,7 +11,7 @@ class SudokuDetailProcessorSuite extends munit.FunSuite with SudokuTestHelpers:
   override def afterAll(): Unit =
     testKit.shutdownTestKit()
 
-  test("Sending no updates to a sudoku detail processor should result in sending a SudokuDetailUnchanged messsage"):
+  test("Sending no updates to a sudoku detail processor should result in sending a SudokuDetailUnchanged message"):
 
       val probe = testKit.createTestProbe[SudokuDetailProcessor.Response]()
       val detailProcessor = testKit.spawn(SudokuDetailProcessor[Row](id = 0))