If you've never played Half-Life, Portal, or Left 4 Dead, you're in luck. Valve's complete pack, which includes just about every game the studio's ever released, can be yours for the low, low price of $25. That is irresponsibly cheap. Dumfounding. I literally smacked my gob.

In all seriousness, though, there's a lot of great stuff here, and at this price the pack is $75 off. The offer ends Wednesday though, so if you want to move on it, you've got a little less than a week.Counter-Strike

  • Counter-Strike: Condition Zero
  • Counter-Strike: Global Offensive
  • Counter-Strike: Source
  • Day of Defeat
  • Day of Defeat: Source
  • Deathmatch Classic
  • Half-Life
  • Half-Life: Blue Shift
  • Half-Life: Opposing Force
  • Half-Life Deathmatch: Source
  • Half-Life: Source
  • Half-Life 2
  • Half-Life 2: Deathmatch
  • Half-Life 2: Episode One
  • Half-Life 2: Episode Two
  • Half-Life 2: Lost Coast
  • Left 4 Dead
  • Left 4 Dead 2
  • Portal
  • Portal 2
  • Ricochet
  • Team Fortress Classic
  • Team Fortress 2 (though it's free to play now, so that's kind of cheating)

You're reading Numbers, a blog on Kotaku that examines games and culture through the lens of math and statistics. To contact the author of this post, write to dancstarkey@gmail.com or find him on Twitter @dcstarkey.

Advertisement