Left 4 Dead 2 gets its first free-to-play weekend on Steam

Steam users will be able to play Left 4 Dead 2 for free this weekend, Valve announced today, giving new players a chance to try out the cooperative shooter set in a zombie apocalypse.

Left 4 Dead 2's first free weekend will also add a new Steam achievement to attract current players. The achievement, "Good Guy Nick," will be awarded to paying players who help a free weekend player survive one of the game's many campaigns. The game is currently priced at $19.99 on Steam for Mac OS X and Windows.

The Left 4 Dead 2 free weekend begins Thursday and ends Monday at 10 a.m. PT. New players looking to play for free can begin preloading the game through Steam today.