Pfff.... probably everything. Even games for other consoles cuz it's so good. You just go tell those electronic spores to read the game, and bam! It's downloaded to their memories.
Oh, well they had a bunch of Mario titles of course since it's made by Nintendo. There was this really cool game that I played on it all the time though called Red Alarm. It's kind of like a gunship shooter kind of deal. Really fun.