Bills Hat in parallel dimension travel conundrum.

Valve has announced an unexpected bonus for all Team Fortress 2 players who have also pre-ordered Left 4 Dead 2: Bill’s hat from Left 4 Dead 1! Just load up TF2 to receive the update and special bonus. If you haven’t pre-ordered Left 4 Dead 2 you will still get the hat if you pre-order now in addition to 10% off the game.

And none of this is any way a gimmick according to Valve:

And lest you think this is just some marketing gimmick, 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.

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