The guys over at VALVe have made an interesting first-person puzzle game that will be released alongside Half-Life 2: Episode 2 later this year. It’s called Portal, and you just have to see it to believe it. You can load the video right now if you have Steam installed, or if you’re a person that believes Steam is evil, you can download the video from GameSpot. IMHO, the Steam video is of better quality.