Build a tower that is as tall as possible. Blocks will swing from the top, and when you tap on the screen, the block will drop down. If it fails to land on the block beneath, then you lose a block. When you loses all your blocks, the game will be over. If you manage to drop the block perfectly on the block beneath, then you get extra bonus scores. As the tower gets taller, it will start to shake. The taller it gets, the wider it shakes, making the dropping of new blocks more difficult.