Left 4 Dead 2 (PC) for $4.99, Shatter for $2.5

* Next generation co-op action gaming from the makers of Half-Life, Portal, Team Fortress and Counter-Strike.
* Over 20 new weapons & items headlined by over 10 melee weapons – axe, chainsaw, frying pan, baseball bat – allow you to get up close with the zombies
* New survivors. New Story. New dialogue.
* Five expansive campaigns for co-operative, Versus and Survival game modes.
* An all new multiplayer mode.
* Uncommon common infected. Each of the five new campaigns contains at least one new “uncommon common” zombies which are exclusive to that campaign.
* AI Director 2.0: Advanced technology dubbed “The AI Director” drove L4D's unique gameplay – customizing enemy population, effects, and music, based upon the players’ performance. L4D 2 features “The AI Director 2.0” which expands the Director’s ability to customize level layout, world objects, weather, and lighting to reflect different times of day.
* Stats, rankings, and awards system drives collaborative play