This is a zombie shooter. The game has elements of horror and is quite complicated.
In the story you're a soldier who was sent to the lab to learn what happened there. Before you do that, you have to go through many levels and clear them of the zombies. Watch out for your enemies are artificialy intelligent.
The game has a wonderful atmosphere. Play and kill as many zombies as you can. Not only them, you will have to fight soldiers and turrets as well.
Earn points and win!