As part of a Kris Graft0 million (£5.9m) ad campaign for its zombie-based shooter Left 4 Dead, Valve Software managing director Gabe Newell confirmed to Edge that there will be an Xbox 360 and PC demo.

That information had already been communicated, but Newell also gave a time window for the demo of "early November."

He also said the demo will be cut from the No Mercy campaign and be playable by one to four players.

Left 4 Dead will ship to retailers on November 17.