21. Left 4 dead 2
Featuring new Survivors, boss zombies, weapons, and items, Left 4 Dead 2 offers a much larger game than the original with more co-operative campaigns, more Versus campaigns, and maps for Survival mode available at launch.
Release Date : Nov 2009
Genre : FPS Survival Horror
Platform : PC/Xbox360
Extract from GameTrailer
Left 4 Dead proved to be a thrilling take on the first-person shooter genre with its focus on co-op play, hilarious characters, and swarms upon swarms of the ravenous undead. With the upcoming sequel Left 4 Dead 2, you can expect a familiar experience that doesn't alter the gameplay so much as dramatically expand it.
Discription ::
Here's the quick summary: Left 4 Dead 2 will feature five new campaigns, as opposed to the original's four. Each campaign will have support for four-player co-op, as well as Versus mode and Survival mode. There is one new gameplay mode that is not being revealed at this time. There are four new characters, new weapons, entirely new melee weapons, and new items. On the flip side, there are new zombies, new special zombies, and a bunch of new gameplay mechanics designed to disrupt many of the tactics and exploits that players have discovered in the first game.
Images
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Teaser Videos
Checking Gameplay video will upload soon