Defend the tower as aliens are in full force of attack. Upgradable. Destroy as many aliens as possible and earn more credits to purchase/upgrade equipments.
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 your land from invading enemy troops. Build defensive towers along the road strategically choosing which type of tower to build, upgrade them in time and always be one step ahead of the enemies.
Destroy the enemy base while defending yours. You can build turrets to defend your base and units to attack the enemy's. The twist of the game is that you can evolve as well as unlock new units and defense means.
