Click to place and upgrade towers and defend yourself against 50 waves of zombie attackers. A tower defense game with zombies! Prevent the undead hordes from reaching the end of the maze by building various turrets. Hover over a turret on the sidebar to display its damage, speed, range and special effects. Click on the turret to select it, and then click on the map to build it. Once a tower is built, you can upgrade it and choose which zombies it should target. Letting a zombie exit the maze will result in a lost life. If you lose 20 lives, the game ends. There are four difficulty levels to choose from.