
Left 4 Dead 2 is now free to play this entire weekend. If you are new to the Left 4 Dead world, we have a list of tips below. If you have been around for a bit, don’t forget we have the Good Guy Nick achievement for you to earn starting today.

We're fast-approaching the celebration of gluttony and cheap costuming that is Halloween, wherein we scare ghosts and demons back into the spirit world by dressing up like political figures and scantily clad nurses. Left 4 Dead 2 is a little on the spooky side, so Valve is letting you trick your treats with a free weekend of the game.
The free period begins on Thursday, with the whole game available to try out. You can begin pre-loading the game now, if you want to jump on the opportunity. For you old hands at L4D2, it also includes a new achievement to chase. The "Good Guy Nick" achievement rewards you for helping a free weekend player survive a campaign. You'll just have to suppress your frustration when they keep shining their flashlight straight at the Witch.
Halloween is on its way, and while ghosts and ghouls may have been the undead horrors of decades past, here in 2012 it's all about the zombies and their ilk.
What better way to get in the mood for spooky doom than with this weirdly lovely, thoroughly instructive image from Left 4 Dead 2? See zombie, apply flamethrower. Now that's useful advice for the ages.
Click the image to expand to its full hi-res gory glory.
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