Speed games, chain reaction games and, basically, any game that requires you to test your quick reflexes. If you're wondering how to have fast reflexes, take a look at this list of fast games and improve your skills by playing these reflexes games.
Apps available in other platforms:
Hexologic: "Puzzle for math addicts"
Hexologic has everything that is needed to be considered a puzzle game: there's something "broken" on your screen and you must tap everything until you can fix it. Thus, it's a game (of course it is) but is also a kind of mental trainer. I mean…