| Introducing the Perpetual Testing Initiative (PeTI) for Portal 2, which combines the powerful, easy-to-use Puzzle Maker and full Steam Workshop integration. Available free for the PC and Mac on May 8th. Visit www.thinkwithportals.com for more information. |
| Portal 2 Aperture Science Perpetual Testing Initiative DLC |
| Views: 332112 | 2012-04-27 |