Destroyed Aperture

Destroyed Aperture is a free, community-made modification for Portal 2.

Story
Aperture Science Facility 7 is empty. Following the failure of the central core, the complex has been consumed by overgrowth and decay. With the exits sealed and communications disabled, David Grayling is trapped, helpless and alone, with no recollection of his past. But when he discovers a teleporter capable of transporting him to other Aperture facilities, he can't help but wonder if salvation lies ahead. Teaming up with a charming personality core named Neado, David steps through the teleporter into the unknown. What dark secrets will he find on the other side? Is he destined to die amid the ruins of Aperture, or can he find a way to escape? Will he ever regain his memories and discover the truth?

Mechanics
Destroyed Aperture's mechanics work similarly to Portal and Portal 2.
 * New, "futuristic Portal Gun that's rusty"
 * New feature - Portable Button
 * Another new feature - currently kept secret by developers
 * 23 levels in 5 chapters, with own story and increasing difficulty
 * Custom in-game developer commentary

Characters
For now, we don't know many things about characters, their amount and personalities. Currently, we know 3 characters:
 * David Grayling - main character played by player, trapped in Aperture Facility 7
 * Neado - a personality core
 * Announcer - propably the same as in Portal 2