Hunter, as a green beret, employed into a military base to eliminate variation in biological. Those mutated creatures arose from a failed biological experiments, after rising throughout the entire base. Hunter is now the base, is poised to variation biological snatch lost everything. Each level is a room at the base, by yellow door leads to a room on the side of the door. But only in the eradication of all variation biological back door will not open. Some rooms have a battery and stores you can upgrade weapons and equipment, you only need to walk to the forts and stores on lattices will come in, and battery power is large, very handy.
W, A, S, D / Arrow Keys - Move.
Mouse - Aim / Shoot.
Spacebar - Go out from the cannon.