Portal 2 (July 28, 2009 Prototype) (**Core Hub** Overwatch Demo)
Portal 2 (Feb 4, 2010 Prototype)
Portal 2 (Mar 18, 2010 Prototype) (**Gameinformer** Era)
Portal 2 (Jul 22, 2010 Prototype) (**E3 Demo**, 1 month after)
Portal 2 (Aug 30, 2010 Prototype) ("Meet Wheatley")
Portal 2 (Sep 24, 2010 Prototype)
Portal 2 (Sep 26, 2010 Prototype) (SFM Sessions)
Portal 2 (Oct 19, 2010 Prototype)
Portal 2 (Dec 1, 2010 Prototype)
Portal 2 (Dec 2, 2010 Prototype)
Portal 2 (Jan 25, 2011 Prototype)
.. a lot more early 2011 prototypes
Portal 2 **Peer Review** DLC (May 2011 Prototype)

Every single **F-STOP** (incl. Paranormal Era) asset, material, sound, voiceline and model, EXCEPT for maps
Every **2Bots1Wrench** DDE asset (except for maps and some animations)
Every **IFM session** used in the making of the Portal 2 demos and trailers
Every single build of the private Portal 2 **Puzzlemaker** beta, but unplayable because of DRM (CEG)
A full file name listing of Portal 2's internal content repository