You find yourself in the middle of nowhere. Hoards of zombies are slowly crawling towards you. It's been days since you last slept. You feel like giving up. Surrounded. Alone. And all that's left to accompany you in these last minutes of your life are:
Use mouse to point and shoot. Use WASD keys to move around. Use SPACE bar to throw grenades. Use Q key to turn on nigh-vision. Survive for as long as you can.