I don't think it's widely known (only found and documented somewhat recently) that there is a way for cartridges to directly drive the Game Boy Color LCD, bypassing the CPU/PPU (PGB Modes). At that point though it becomes even less of a Game Boy game than what the Wolfenstein and other carts are doing.
Also related: "There oughta be GTA5 for the Game Boy" about a Wifi cartridge that can stream video (gameplay, etc) directly to the GB screen.
https://there.oughta.be/gta5-for-the-game-boy
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I don't think it's widely known (only found and documented somewhat recently) that there is a way for cartridges to directly drive the Game Boy Color LCD, bypassing the CPU/PPU (PGB Modes). At that point though it becomes even less of a Game Boy game than what the Wolfenstein and other carts are doing.
https://gbdev.gg8.se/wiki/articles/Gameboy_and_Gameboy_Color...
Also related: "There oughta be GTA5 for the Game Boy" about a Wifi cartridge that can stream video (gameplay, etc) directly to the GB screen. https://there.oughta.be/gta5-for-the-game-boy
GBC had GTA2 port which wasn't half bad but the Driver port was smoother and with better mechanics.