Valve's announced that another bout of free Portal 2 DLC will hit Steam on May 8. It's dubbed "Perpetual Testing Initiative" and allows players to easily create, share, and play Portal 2 puzzles.
Creations can be directly published to Steam Workshop from within the game, which means you never have to leave the confines of Portal 2[...]
Continue reading: Perpetual Testing Initiative DLC Hits Steam May 8, Simplifies Portal 2 Puzzle Creation...