Valve has today made Portal 2’s puzzle creating DLC available for download. The “Perpetual Testing Initiative” is a free piece of DLC available on PC. It offers a simplified puzzle maker that will allow easily create, share, and play Portal 2 puzzles via Steam Workshop. As of now gamers have created 4,346 puzzles.
If you do not have Portal 2 and you want to get in on this action Valve is selling the game on steam for a limited time. You can pick up Portal 2 for $6.79, or get a bundle of Portal 1 and 2 for $8.49.