Teach with Portals

[Bowsling]

http://www.teachwithportals.com/

It's... interesting to say the least. Never realized that Portal 2 could be an educational game (or that their physics engine is actually that accurate.)

 

[Sonereal]

Not only is that pretty cool, but the Aperture Laboratories at the bottom is a nice touch.

 

[scheva007]

I remember there being a 24h action on steam where you could get portal for free, because of some learning insitute day