ROM_HACKING For those who want to try and alter the gameroms from nintendo entertainment system (NES). preparation: 1)The actual rom itself(for NES you have to have .nes) 2)emulator to emulate the rom, we recommend FCEUX 3)A hex editor (HexEdit). 4)A tile editor (YY-CHR) to start you can edit the tiles by opening the .nes file using the tile editor and start looking at the sprites and modify some of them.