The community can now create test chambers for two people to solve.

If you're a map-creator in Valve's Portal 2 get excited, because you can now create test chambers that require two people to solve it.

The co-op update has gone live, and the game will update the next time you log in to Steam.

The level-building portion of the game, entitled the Perpetual Testing Initiative, went live back in May and since then there have been over 170,000 single-player test chambers created for people to download and play.