I've done a search and can't seem to find much info about this. I've known about a prototype of the NES Batman game for years, all credit due to System Failure. The version I just linked to was different from the final release ONLY due to a few cheat codes being present.
Recently, though, I did a search of the Batman prototype on YouTube to see some videos of it in action, but what I found was this video that showcased a version of the Batman prototype different from the one mentioned on System Failure. This version has different cut scenes. The person who made the video links the ROM as being available on Scrybe's website, but there's only a link to the ROM and no info on the prototype itself. Does anyone know anything about this one, like how it was found and by who, exactly which version it is, or why they changed the cut scenes in the first place? For me, the history behind a prototype is as interesting as the prototype itself.