After a massive war wipes out most of the world, you wake up in an infirmary named Bulwark 53. Everything seems quite, until zombies start popping out of the darkness. Move around using WASD, and shoot by clicking the left mouse button. You can only shoot a few times before you have to reload, using Spacebar, so don't let yourself get overwhelmed! You will find different weapons in the game, and you can choose between them by pressing the 1-6 keys. Medic packs are all scattered around. Restore your health with the M key.