Survive all the waves! Every match, the player starts off with 600 cash to purchase and upgrade towers. There are 3 difficulty selections: Easy, Medium and Hard. There are 40 waves, each having their own layouts. The bosses depend on which difficulty you are playing, and each having their own abilities! You can select 5 maps: Spiral, Corners, Long Path, The Line and the Reverse Track. There is also a secret mode if you beat Hard Mode in less than 15 minutes, Hidden Wave.