As brilliant as the Portal 2 single player is, I've got my fondest memories of the co-op, introducing people who haven't played games, or an FPS, before to Portal by literally lending a helping ...

A video preview of the Perpetual Testing Initiative DLC for Portal 2 has been released by Steam user Doogiehoogie. It's posted below. The DLC allows users to create, share, and play Portal 2 ...

Valve confirmed the in-game level editor for Portal 2, showed off two screenshots of it, and announced it will be part of a major update to the game due out early next year.

The editor-- announced last October --will arrive as part of the free Perpetual Testing Initiative downloadable content. Gamers can begin building their own Portal 2 levels on May 8.

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Portal's been begging for its own level-creation tool since GLaDOS first began turning ...