Today Valve announced that the Perpetual Testing Initiative DLC for Portal 2, which allows players to easily create their own test chambers, will be available May 8 – for some users, at least.

According to Valve's press release, the DLC "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." The catch? It's only being released on PC and Mac. Players on those systems can download the DLC via Steam for free May 8.

I couldn't think of a better format for incorporating user-created content into an FPS than Portal's isolated test chambers. It's just too bad console owners are apparently being left in the lurch (though not entirely surprising).

We have asked Valve if it has any plans to release the DLC on 360 or PS3, and will update this story if we hear anything back.