J.K. Simmons returns as several alternate-universe versions of Aperture Science CEO Cave Johnson in Portal 2's new level editor, Perpetual Testing Initiative, and his hilarious level-starting quips have been compiled into a single 25-minute YouTube video.

Not gonna lie: I listened to the entire thing. Also, chariots. Chariots chariots chariots.

[toplessrobot.]

Valve's Portal 2 level creator DLC, Perpetual Testing Initiative, is out today, along with an important memo from Aperture Science head honcho Cave Johnson.

Cave Johnson here. Your boss. It's come to my attention that some of you are concerned after receiving my all-staff memo yesterday ("You: Design Test Chambers or You're Fired"). So to put your minds at ease, let me clarify: You are not mentally ill and you did read the memo just fine. It was real. You should be designing test chambers, right now and at all times, or by God I will fire you.

Sounds serious. I'd get to work before the man with the combustible lemons gets any angrier.

Perpetual Testing Initiative is available for Windows and Mac. You can grab it for free on Steam.

[kotaku.]

The twisted geniuses at Aperture Science Valve have announced plans to release an easy-to-use Portal 2 puzzle editor, called Perpetual Testing Initiative, that will allow players to create, play and share Portal 2 levels without leaving the game.

Player-created puzzles can be published to the Steam Workshop for download and voting, and the top-rated test chambers will be officially added to Portal 2.

The Perpetual Testing Initiative begins May 8.

[g4tv.]