Amnesia Fortnight (opens in new tab) is how Double Fine turns creative people into games—everyone on staff is hit on the head with a brick or some other amnesia-inducing device and spends two weeks prototyping new ideas. It's how Costume Quest and Stacking were greenlit, and last year Double Fine introduced us to the process by letting us vote on concepts in its first Humble Bundle collaboration (opens in new tab) . Those prototypes, and a few more, are now available again through the current Humble Double Fine Bundle (opens in new tab) .
Along with Psychonauts, Costume Quest, Stacking, and Brütal Legend, beating the average price (currently $8.15) will now also get you Windows-only concept games Autonomous, Black Lake, Hack n' Slash, Spacebase DF-9, The White Birch, Happy Song, Brazen, and the Costume Quest prototype.
Also added are the prototypes' soundtracks, as well as 2 Player Productions' Amnesia Fortnight 2012 Documentary, which was originally released as daily video updates during the two-week prototyping crunch. Check out the trailer below: