Valve's ongoing potato sack ARG has turned up a treasure trove of Portal 2 concept art. As well as a number of alternative designs for Chell, there are also more than 20 designs for a Portal 2 ...

Aperture Tag replaced your portal gun with a gel gun, allowing you to fire repulsion and propulsion gels to solve puzzles. But none of them quite felt like the real, Valve-developed deal. That was ...

F-Stop, as the canceled game was reportedly called, would have ditched the original game's portal gun for the Aperture Camera. (Aperture is a reference to the fictional corporation behind the ...