PC gamers should also gain access today.

Left 4 Dead 2 screenshot

Following a period of exclusivity to those who'd pre-ordered the game, the Left 4 Dead 2 demo is now available on Xbox LIVE Marketplace to those who haven't pre-ordered.

The Xbox 360 demo is, however, restricted only to Gold members, while the PC demo should be available via Steam at some point today. Xbox 360 gamers without a Gold membership will have to wait until November 10.

The Left 4 Dead 2 demo features gameplay taken from "The Parish" campaign, set in the New Orleans French Quarter. Playable by 1 to 4 players over local or Internet connections on both the Xbox 360 and PC (with two-player split screen available on the Xbox 360), the demo features all the new boss infected zombies and new melee weapons included in the full product.

Left 4 Dead 2 is scheduled for release only for PC and Xbox 360 on November 20.