If you are one of the many people who have pre-ordered Left 4 Dead 2 or plan on buying it before the day is through, you're probably curious as to when exactly the game will be unlocked. Valve has announced that for those who have preloaded the L4D2 files, the game goes live sometime today. Since Valve's servers will unlock it at all at once, the exact time will vary based on your time zone.

For users in Pacific, Mountain, Central and Eastern time, the game goes live at 9PM, 10PM, 11PM and 12AM. It's nice that Valve is able to unlock it at the exact same moment for everyone around the world, but that also means somebody, somewhere is going to get shafted -- at least temporarily.

Hopefully, Valve's decision to make preloading available a week in advance will ensure that surging demand for the game doesn't ruin it for everyone.