The first player to play all of the cards in their hand in each round scores points for the cards their opponents are left holding. The first player to score 500 points wins the game...
Be the first player to score 500 points. Points are scored by getting rid of all the cards in your hand before your opponent(s). You score points for cards left in your opponents' hands...
Don't make the tower fall! Pull blocks that match the color or number of the last one pulled and re-stack them on the top. Or pull an Action Block, and make the next player follow that Action! But don't make the tower fall, or you lose...