Load bullets and destroy all zombies!
Buy guns you like, such as pistol, SMG or shotgun.
When you are exploring in ruins, please pay attention to bullets from far distance.
Right, zombies here have lost consciousness but still can shoot survivals.
The most safe way is to take advantage of boxes as shield to kill them one by one.
When you come front zombie army, just throw grenades to them or get the right chance to blow up oil drum close to you. These ways will help you finish missions better.

TIPS: Bullets from zombies will have surprising effects based on your moves.
More surprises are waiting for you to explore.