Left 4 Dead 2 PC Pre-Orders Bring Bill's Beret to TF2

Valve has announced that hat-hungry Team Fortress 2 PC players who pre-order Left 4 Dead 2 on Steam or redeem a retailer-provided pre-order code can now don this fall's hottest TF2 fashion accessory--the green beret made famous by Bill in Left 4 Dead.

"For the first time in history, two separate Valve universes collide," Valve proclaims in a post on the TF2 Blog. "This is not fan fiction! This is not a dream sequence! The characters from Team Fortress 2 will team-up with Bill's hat from Left 4 Dead 1!"

"And lest you think this is just some marketing gimmick," Valve explains, "here's the intricate back-story justifying it: while conducting a science experiment on parallel dimensions, Bill's hat fell off a table into the Team Fortress universe."

In other L4D2-related digital clothing news, Valve has confirmed to G4tv that Left 4 Dead 2 on Xbox 360 will grant Live avatar items in return for achieving certain tasks. Nine awards in total will be up for grabs, including a med pack and t-shirts.

• Left 4 Dead 2 Shirt - A Left 4 Dead 2 shirt earned by winning 10 games of Scavenge

• Left 4 Dead 2 Shirt #2 - A Left 4 Dead 2 shirt earned by winning 10 games of Scavenge

• Depeche Mode Shirt - A sweet Depeche Mode shirt earned by rescuing Gnome Chompski from the Dark Carnival.

• Depeche Mode Shirt #2 - A sweet Depeche Mode shirt earned by rescuing Gnome Chompski from the Dark Carnival.

• Zombie Hand Shirt - A scary zombie shirt earned by killing 10,000 Infected

• Zombie Hand Shirt #2 - A scary zombie shirt earned by killing 10,000 Infected

Bill's beret is but the latest in a line of pre-order incentives for the Left 4 Dead 2, which have also included an exclusive in-game baseball bat weapon. Valve's zombie shooter sequel is scheduled to arrive for PC and Xbox 360 on November 17.