Portal 2 Level Creating SDK is Released to the Unwashed Masses
Now you can kick it GLaDOS-style and make your own test chambers. You could also probably make some furry wonderland made entirely out of genitals. Dev Kits are crazy like that.
The SDK will give you the tools to make singleplayer or co-op maps, new character skins, 3D models, sound effects, and music. It’s still in beta, but that’s never stopped anyone before. Anyone who owns Portal 2 (the PC Master Race version, of course) can jump on Steam and find the kit under the “Tools” tab.
Get out there and create your mind-numbingly difficult puzzle room/anthropomorphic sex palace today!
Source: Portal 2 Website