This is a little off the beaten track for our Reviews section, but I know that many of us play Portal 2, and you're probably already familiar with the Perpetual Testing Initiative for creating and spreading user-created levels. To start us off, Mreksm created a level that I enjoyed playing called Escher, which you can try out here:

http://steamcommunity.com/sharedfiles/filedetails/?id=85440327

What do you think? Have you created any levels of your own you want to share?