This is doing the rounds right now, and totally, totally worth the watch and wait.
I get the first portal option. I get the second, although it furrowed my brow. The third..euhh… the rest of them? This will make your brain hurt. I can’t wait!
Half Life 2: Episode 2: Portal (Eurogamer)
If you’d like to play the original, I think you can still get it here:
Apparently they hired the guys who made it.
Soooooo awesome. 🙂