Programmer Brian Provinciano started Retro City Rampage as an authentic prototype running on the NES hardware, as a proof of concept that a game like Grand Theft Auto III could have existed in the 80s. Now that the game is out for modern systems, he’s attempted to put his game back onto his original prototype, showing that much of it was possible, while demonstrating the ways he had to compress the game and showing what certain programming terms of the time were.