The new free Portal 2
update titled "Perpetual Testing Initiative" is now available on Steam!
The "Perpetual Testing Initiative" 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 puzzle maker can directly publish maps to the Steam Workshop
where users can browse, vote on, and select to play them. Selected puzzles will automatically be downloaded and installed inside Portal 2.