A hidden research facility, location unknown, is under attack. You're a scientist on the brink of a breakthrough. Don't let them catch you—grab a gun and shoot your way out of there alive! Develop your character as you see fit: level up 4 unique classes, learn special skills, and unlock over 65 weapons. Play the campaign mission for an action-packed story, but let challenges truly test your skills... WASD/Arrows = Move Mouse = Aim & Shoot Q/Shift = Switch Weapons E/Ctrl = Killstreak R = Reload