Posted on April 26, 2012, Phil Hornshaw Valve Announces Free Portal 2 Level Creator DLC for PC, Mac
That’s because Valve has just announced the Portal 2 Perpetual Testing Initiative, a free batch of DLC that brings a level editor to the PC and Mac versions of Portal 2. As you might guess, that’ll mean that not only can you design and play your own Portal 2 test chambers, you’ll also be able to share them with other players and try out the levels designed by the rest of the community.
The DLC pack will hit Steam on May 8 and will utilize Steamworks to let users publish and share their maps. Unfortunately, the Steam forums seem to confirm that the level editor won’t support cooperative play. Hopefully Valve can make that happen sometime in the future.