Portal 2 "Perpetual Testing Initiative" trailer

Valve has introduced the Perpetual Testing Initiative (PeTI) for Portal 2, which combines the powerful, easy-to-use Puzzle Maker and full Steam Workshop integration. It's available free for the PC and Mac on May 8th.

Portal 2 PC

Developer
Valve Software
Publisher
Electronic Arts
Release Date
21 April 2011
Genre
Action: First-Person
Classification
Parental Guidance Recommended