Volition has made a prototype PSP game, Saints Row: Undercover, available to the public.

The cancelled PSP game was revealed by Volition during a Twitch stream, and now it’s available for anyone to download.

The ISO file is 431 MB, and it’s fully playable in a PSP emulator like PPSSPP, but it doesn't appear to work on PSPs – even modded ones.

There’s even a 122-page design document available for the game.