Desperate Crisis-zombies run at Mac App Store analyse

When you wake up , you find that the desperate is coming,and you have only one choice ,escape from here! The dark night falls, the ugly voice is endless, you struggle to get out of the tent and find that the zombies have surrounded you! All you can do is run away and escape their claws! But when you will end up exhausting, face life and death, pick up your weapon and start your counterattack! For survival!