The open-source city building game for Game Boy Color.
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Tuff - An original game for the Nintendo GameBoy
Pokémon Red/Blue overhauled with full GBC support. Made by FroggestSpirit, Drenn, and dannye. Also check out the crysaudio branch.
Source code for the book "Game Boy Assembly Programming for the Modern Game Developer"
RGBDS include file for Game Boy hardware definitions