From the publisher's website:
Ligretto is a fast-moving card game, where you must get rid of your Ligretto stacks as quick as you can to be the winner. You must have fast hands and quick thinking, as the need for spead is key in this color stacking card game. All players play at the same time, so there's no time to lose. Add different colored decks together for a lightning fast game for up to 12 players.