Valve, creators of best-selling game franchises (such as Half-Life and Counter-Strike) and leading technologies (such as Steam and Source), today announced the free Portal 2 DLC titled “Perpetual ...
Valve has announced the free Portal 2 update, Perpetual Testing Initiative, is now available on PC and Mac. The DLC allows players to "easily create, share, and play Portal 2 puzzles," via the in-game ...
Excellent news gentlemen. Our friends over at Aperture Science have begun work on the Perpetual Testing Initiative for Portal 2. How will this work you ask? Well, Cave has come up with a fine and ...
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