I picked up The Orange Box last night and played the included puzzle game Portal. You can see a demo of what the game is here on you tube. The game is awesome! Its got puzzles, comedy, and neat effects. I finished last night in around 3 hours and am looking forward to trying out the advanced levels tonight.The concept is kind of hard to explain so its best if you check out the video. The basic idea is to use a gun to create wormholes throughout the game to accomplish various tasks. There is a ton of comedy in the game from the computer. They did a really nice job with this game. My only complaint is the shortness. Also, the puzzles could have been a bit more complex (though I think the advanced levels will address my concern). I can't wait to see more of this in the future.