Survive the night fighting off zombies from your barricade. Survive longer than a day by making use of the daylight hours effectively by repairing your barricade, searching for weapons and looking for other survivors to help repair and defend.
Snipe the snipers before they snipe you. Once you start shooting, the sniper timer will count down fast so you may want to try and remember their positions if you can. Watch out for the sneaky soldiers that move in and out of cover.
The nano robot called Antidote must protect human body from the attacks of various viruses. Try different combination of weapons to find out what works best for each level. Humanity needs your help!
Shoot the targets that are moving around the assault courses. Make sure to hit enough targets and progress to the next level. Try to earn over 2000 points on a level to unlock bonus mod AK-47!