Cave Johnson Returns In Portal 2 Perpetual Testing Initiative Video
Portal 2's test chamber editor will be available on May 8, and Valve put together a video to remind everyone that it's coming soon.
J.K. Simmons returns to offer his Cave Johnson voice over explaining how it all works, and it is unsurprisingly hilarious. I could watch a 90-minute feature of videos like this.
Unfortunately, the editor has only been announced for PC.