Strategically place your army against waves of enemies. Shop for new weapons of destruction at your local War-Mart and upgrade them to deal maximum damage!
Zombies and ghosts are invading! Defend the local neighborhoods by building an array of towers to shoot at them and open gates to redirect their hungry minds to places of choice.
With biochemistry polluting a island, a mass of bugs became evil, started attacking trees. You're sent on a mission to eliminate biochemical trees and eradicate the evil bugs.