's level-editing DLC, the Perpetual Testing Initiative, will push the boundaries of physics and patience on May 8 for PC and Mac, and the above video shows us exactly how. It appears prolific level creator TopHATTwaffle
originally uploaded the video but took it down at Valve's request, and it has since been uploaded by another, less remorseful Internet denizen.
The walkthrough shows a blank map as it switches between edit and playthrough modes, and the ease of creating unique, new Portal 2
levels. The only thing we think it's missing is the vocal stylings of J.K. Simmons, but we'll just content ourselves with drinking whisky and yelling at the screen every now and then.