"Valve issued a challenge to Left 4 Dead 2 players: if the community could earn the Stream Cross achievement 20,000 times, Valve would release the Cold Stream DLC pack for L4D2 early. The company was apparently surprised, but the L4D2 community was able to earn this achievement 20,000 times in about 4 hours. In fact, in 24 hours they passed 60,000+ and locked in the early release."

Hoping to ease the confusion about tonight's release of Left 4 Dead 2, Valve has updated the Left 4 Dead blog with a handy-dandy listing of worldwide Steam unlock times.

While those seeking the Xbox 360 edition will have to hit up a retailer--some are opening at local midnight for the occasion--those that have pre-ordered and pre-loaded the PC version via Steam will be able to play at:

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, the demo features new melee weapons and all the new boss infected zombies included in the full product.

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