The enemies are trying to enter your country and they are planing something big. America's finest agent was sent to destroy enemy base and kill them all. Destroy the base, kill all the enemies and get your base back.
The world has gone to hell and the zombies are taking over. Play as both human and zombie in which you can only interchange between human and zombie 5 times.
Defend the planet from waves of invaders. Kill all your enemies, pick up bonuses, upgrade your tank, unlock new types of guns to deal with the 8 end-level bosses throughout the game.
