Portal 2 Perpetual Testing Initiative Starts Now

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 arrival of the free Portal 2 update titled "Perpetual Testing Initiative."

Available now for PC and Mac, The "Perpetual Testing Initiative" allows players to easily create, share, and play Portal 2 puzzles. The Initiative comes with a simplified Puzzle Maker that allows that creation of mind-bending puzzles without ever leaving the game.