Fluxx
A card game where the cards themselves determine the rules.
You’re able to play with up to three friends or have AI opponents take their places. At the start of the game, each player holds three cards in their hand. On a turn they’re able to draw on card and play another. By playing a card new rules will be put into action, changing the makeup of the game. This results in some pretty wacky events, which can make games last only a handful of seconds to more than 30 minutes. A rulebook is available in case you need some help along with a tutorial for new players. The game also includes online play, 12 avatars to choose from, player stats, and achievements via Game Center.