As one does, I’ve written a game boy emulator that also supports the game boy color. Unfortunately, it has a few glitches, with some games refusing to run at all. For instance, in GBC mode, Pokémon Crystal nearly immediately shows a bright red screen that (slowly, but still) flashes a vertical stripe pattern in white and red: On my way to work, I watched a video by TheZZAZZGlitch about types of crashes in Pokémon Red/Blue.