Earn a perfect score of three stars in every level of this tower defense game. Protect the Apocalyptic Tower and the survivors inside. Build turrets and cannons over the main tower, by placing them carefully. Upgrade the defenses by using the earned money and also increase the overall size. Defeat the waves by aiming at the enemies, while shots come out automatically. Call new waves with Space-bar and use it to resume in case of pauses. Think which weapon can be better used in the levels yet to come. Clear every stage to advance and earn even more points and cash.