In Tower Mode, you must climb through its infinite number of floors to see how high you can get, each floor representing a short challenge, of course. Each floor has its own random set of foes for you to tackle, but the catch is, there's no AI limit, so you may encounter some pretty insane setups. That being said, you'll also be occasionally given 3 boosts to pick from. Intelligent use of these is a must if you wish to make it as high as you can.