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Left 4 demo arrives on PC and Xbox 360

Try out two maps from new zombie shooter.

Valve has unleashed PC and Xbox 360 demos of Left 4 Dead.

We did know about this, but assumed a brief reminder wouldn't be met with pitchforks or hordes of undead keen on chomping at our faces.

The Xbox 360 sampler weighs in at 1.2GB, and offers up the first two of five No Mercy maps, which are playable both on your own and with friends.

The copycat PC sampler, meanwhile, can be grabbed from Steam.

Left 4 Dead is the co-operative zombie-survival shooter from Valve, where groups of four humans use guns to ward off hordes of Infected, which move frighteningly fast and savagely.

The result is overwhelmingly fun, as many of you found out at the Eurogamer Expo recently. We even screamed.

Left 4 Dead launches for PC on Steam on 18th November. Shops will then stock the game on Xbox 360 and PC from 21st November.