Here's a game that everybody can enjoy.
Well, so long as you speak Japanese, and own a NTSC-J compatable Playstation 2 system (or have a boot disc) that is.
If you've seen the anime, than you'll really love this game.

Currently out of print, but not to hard to find, Lost Colors is still available for purchase at a somewhat reasonable price (considering its out of print).

I'll let the Code Geass experts discuss the inner workings of the game while I try to figure out why the damn BB code for the spoiler tag isn't working here on the boards. :(