A little over a year after its release date, Portal 2 has officially sold over 4 million units worldwide. On the heels of that milestone, Valve is still pumping out DLC for the game.
Though it is unclear what percentage of the units sold went to what console, the game was released for PC, PS3 and PC, the sales are a great accomplishment.
New DLC was recently released for the game as well, in the form of a ‘Puzzle Maker’ that allows gamers to create their own puzzle-chambers which can later be uploaded, rated and played by the community. The DLC is named the ‘Perpetual Testing Initiative’ and is available on PC only at this time.
source | neogmr
