Save 75% on Defense Grid: The Awakening as part of this week's Weekend Deal*!

Defense Grid: The Awakening is a unique spin on tower defense gameplay that will appeal to players of all skill levels. A horde of enemies is invading, and it's up to the player to stop them by strategically building fortification towers around their base. Beautiful environments, spectacular effects, and a dynamic, engaging soundtrack bring the world to life. The controls are intuitive and the gameplay is deep — the special attacks and properties of each tower work together to provide many ways to succeed.

*Offer ends Monday at 10AM Pacific Time

Today's Deal: Save 75% off Defense Grid: The Awakening!

Look for the deals each day on the front page of Steam. Or follow us on twitter or Facebook for instant notifications wherever you are!

Midweek Madness! Grab a special collection of Indie titles for one low price!

The Indie 2D Bundle includes: Swords & Soldiers HD, Bit.Trip Runner, World of Goo, NightSky, and NyxQuest.

The Indie Strategy Bundle includes: Revenge of the Titans, Sanctum, Sol Survivor, Defense Grid: The Awakening, and Anomaly: Warzone Earth.

Offer ends Thursday at 4PM Pacific Time.

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?