Acclaim was cashing in with console ports, and developer Crawfish Interactive had a Game Boy Color platformer fully completed and ready to ship. The cartridges were about to go to Nintendo. Then Trey Parker and Matt Stone took a look at the Game Boy Color's marketing — a handheld aimed at children — and decided an adult animated series about foul-mouthed Colorado schoolboys had no business on it. Custom cartridge, plug and play. Compatible: GBC, GBA, GBA SP.