News has emerged that Valve will be releasing a demo of its 4 player co-op zombie shooter Left 4 Dead. The demo, which should be out shortly before release, will more than likely be the first two maps of the game. The two missions start outside in the streets and later lead you into a subway station.

Left 4 Dead will be out on Xbox360 and PC with rumours of a PS3 version later to follow (not confirmed by Valve). The game will be available Nov 18th on Steam and the 21st in the shops.