Stop the zombie invasion. Use WASD to move, mouse to aim and shoot, C to bash in brawl, X or WASD to jump the barricades, F to place or throw devices, R to reload weapon, spacebar to open inventory, Z to use the IR visor, Q to repair barricades and to stoke campfire, 1 to switch guns, 2 to switch rifles, 3 to switch launchers, E to switch devices.