Translation of the Sega Game Gear game "Mappy" from Japanese to English. Since the game itself has English UI, this consists of replacing the single Kanji-using options screen with one in English.
This serves as an example of how you can:
- Replace screen drawing code with something entirely custom
- Patch ROMs using WLA DX to do the heavy lifting
- Make use of unused space in the ROM
- Use off-the-shelf compression to crunch the data down