Can be done online or with two controllers. To get a win, you must score a point by removing a block and placing it on top of the tower successfully. Every so often, the second player goes first. When this happens, they must score, than you score points on your turn as well. Once you have scored, the other player can lose the match by knocking the tower over, or by dropping their block instead of placing it on top of the tower. It's recommended to just drop the block, as it's a bit faster than trying to knock the tower over.