Putting aside their usually persistent humour for a minute, Valve has sent through word the "Perpetual Testing Initiative" (or level editor DLC) for Portal 2 is now available for Mac and PC.
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.
You can learn more by clicking here
, otherwise be sure to drop us a line if you do make some of your own puzzles in the Comments section.