Topple is a fun and playfully designed stacking game that's visually reminiscent of games like Tetris. Its clever use of the iPhone and iPod Touch's motion sensor and touch screen makes it a unique and addictive app. In each level, you drag, rotate, and stack an endless series of different shapes onto a tall, teetering tower--usually trying to beat a certain time limit and height goal. You can move and manipulate the shapes with your touch screen, and as your tower grows you steady it by tilting your device left or right. Extras like an impressive musical score, lively animations, and hidden achievements make Topple a solid value with a lot of potential for replay.