In celebration of passing several milestones like selling 1 million copies, having over 45 million hours of playtime and destroying over 500 million Zeds , save 85% on Killing Floor during this week's Midweek Madness!

Kick off the weekend by playing Killing Floor for FREE starting now through Sunday at 1PM Pacific Time.

Additionally, pickup Killing Floor this weekend only at 75% off the regular price! Sale ends Monday, November 21st at 10AM Pacific Time.

Plus, the Twisted Christmas event has started, so check out the Christmas themed monsters, achievements, music, an all new level "Ice Cave" as well as seven all new weapons!

If you already have Steam installed you can click here to install or play. If you don't have Steam, you can download it here.

This weekend is the last chance to pre-purchase Portal 2. Get your copy now, save 10% and be ready to play the moment it is released.

Help release Portal 2 early: From now until release, play any or all of games in The Potato Sack to expedite the launch of Portal 2. Your efforts will be tracked on the official GLaDOS@home page.

Each game in The Potato Sack has received a massive Portal-themed update, making a collection of 13 hit indie games even better. So why not get a taste of Portal 2 now while you help launch it?

To commemorate the release of "The Twisted Christmas" Update (FREE!), Killing Floor is available at 66% off now through Dec. 16th at 4pm PST.

In addition to the free update, you can add more to the mayhem by purchasing the new "London's Finest" character Pack DLC at a nominal price.

Check out the free Twisted Christmas Update you can enjoy now until Jan. 4th 2011:

• All new level: Santa’s Evil Lair
  
• Added a new difficulty called "Hell on Earth", which is more difficult than Suicidal was
  
• All creatures in game replaced with Christmas themed monsters including the Gingerfast and the Nutpound
  
• More than double the achievement count with over 130 total achievements
  
• 13 new Christmas achievements
  
• Unlockable "Baddest Santa" playable character
  
• New DLC Character Pack dubbed "London’s Finest"
  
• Red or blue Pyro from Team Fortress 2 playable character available to anyone that owns both Team Fortress 2 and Killing Floor
  

The Ball is now available for Pre-purchase on Steam. Purchase before Oct 26th and receive 10% off plus an exclusive in-game character for Killing Floor!

The Ball is a first person action-adventure game featuring a full single-player experience built on Epic’s Unreal™ Engine 3 technology.

As a swashbuckling archaeologist working on the slopes of a dormant volcano somewhere in Mexico, you get stuck in a cavern. It doesn’t take long before you realize this is more than just a cave. You reveal ancient ruins that have been hidden from outsiders for centuries and discover a mysterious artifact, a gold and metal shelled Ball. As you progress towards solving the mystery of this amazing place you must unlock the secrets of the Ball and learn to control this ancient artifact.

To commemorate the release of Incendiary Update and the new PostMortem Character Pack DLC, everything on Killing Floor - from the main game to DLC - can be yours at half the normal price. Act now! Offer expires on Monday, Oct. 11th at 10AM PDT.