Control the tank and destroy the buildings to get the zombies! In this game you need to use either your W, A, S, and D keys or your arrow keys to move around. You then take your mouse to aim and press the left mouse button to fire. When the zombies fall out, don’t bother trying to shoot them. It’s much faster and much more efficient to just run them over with the tank. Also, there are a LOT of zombies in each building- there is a meter with a percentage that tells you your progress.