Updates to Defense Grid have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:

Defense Grid April 2011 Portal 2 ARG Updates:

• Two free new and original Defense Grid Levels with new voice acting and story.
  
• Portal's GLaDOS invades the network and brings a new style of level design to Defense Grid.
  
• New computer console off the main menu. Poke around in the old computer archives, try out puzzles, and learn some DG back-story.
  
• Tesla towers now recharge faster and do more damage.
  

April 13 update:

• CHAS level is now unlocked for everyone!
  
• Recruiting is still important, so keep it up.
  
• Tony has one more trick up his sleeve
  
• Three more clues to find
  

Updates to Defense Grid have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:

• Tesla towers fixed and updated
  
• Console fixed and updated
  
• Recruits fixed and updated
  
• CHAS levels fixed and updated
  

Updates to have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:

• Something has fixed much of the file corruption...
  
• D and G glyphs were swapped. Fixed now. Oops.
  
• Subtitles should display properly now.
  
• #potatofoolsday
  

Updates to Defense Grids have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:

• Profile is now backed up after each content update
  
• Increased the overall number of .dgp files in the game folder
  
• Modified some of the menus to better use vertical space
  
• Made the front end more savory
  

Updates to Defense Grid have been released. The updates will be applied automatically when your Steam client is restarted.

• Added support for future DLC.
  
• Fixed performance problems related to ATI video cards.
  

Updates to Defense Grid: The Awakening have been released. The updates will be applied automatically when your Steam client is restarted.

• Support for DLC is enabled. Check out the new FREE DLC pack, Borderlands! Four challenging levels new to Steam players.
  
• Upgraded leaderboard performance - Defense Grid now uses the official Steam leaderboards. Unfortunately, this change resets all existing leaderboard entries, but the good news is that all of the leaderboards are wide open and waiting for your high scores to post. Defend the cores and show others how good you are.
  
• Corrected a bug in which Cannon towers would sometimes fire twice as often when using fast forward.
  
• Fixed an issue in which AI audio would still play even if the Voice Over volume was turned all the way down.
  
• Fixed an issue that prevented the Voice Over volume slider from responding to mouse input.
  
• The Achievements button on the Main Menu will now take the user directly to their stats and achievements page for Defense Grid.