Portals, phun with physics

Got done playing Portals from the Orange Box yesterday and that game is a blast.  It doesn't have nearly enough levels though-I hope to see some sort of expansion or full feature based off of it.

I always have fun playing puzzle games like that (one of the things I really liked about the Prince of Persia games).

I found the way that it used physics to really make you think about how to complete an area great. From the obvious I need to jump in a hole in the ground to get launched across the room to having to go flying out of a poral several times to build up enough momentum and the the strategically placed portals to pick up a robot or drop something (prefereably another robot) onto one it was pure brain scratching fun.

Portals is one very good reason (of many) to get the orange box.