Zombie Apocalypse Tower Defense

The zombies are over running your precious land in the Zombie Apocalypse Tower Defense game.  You are going to have to use your best tower defense skills to protect the guy in the center of the tower.  You can also use the trains to run over the zombies that are on the tracks as another way to defend against the attacking zombies.  After you complete each wave you can use your cash to buy upgrades in this cool tower defense game.