Defend the catacomb by buying cannons to destroy the advancing zombies. The zombies and cannons all vary in speed, range and power. Your objective is to survive 14 levels. Zombies will pass through to attack the catacomb.
You lose the game if the catacomb is destroyed. When you destroy an zombie, you will get extra money to buy more cannons. When the game progresses, there will be more and more zombies and they will become stronger and stronger. There are a total of 14 levels.