Go through the rooms in search of key objects to help you to uncover what has happened. Try to escape alive of each level alive. Use the key E to interact with the environment.
See how good you are and shoot the birds that are ruining the harvest. The more you kill, the more points you get. Use your mouse to play, your weapon will recharge automatically.
Enjoy this zombie fight and defeat the opposite band to reach the highest level. Pick your soldiers and send them to the fight. Buy improvements with the money you earn. Use the mouse to interact.