He's the guy who fought a vicious campaign to prevent record-breaking newcomer Steve Wiebe from becoming the first player to score a million points in the classic arcade game - successfully, as it turned out, with record-keepers Twin Galaxies accepting Mitchell's run over Wiebe's.
Where things get really interesting, though, is when you consider that Twin Galaxies also now considers all of Mitchell's arcade records across all games to be invalid as well.
Read their full, painstakingly detailed statement below.
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One of the rules Twin Galaxies has for submitting high scores for the original DK arcade game is that you achieve that score on, funnily enough, original arcade hardware rather than an emulator.
But that score was taken away from him by Twin Galaxies on Thursday, as was a 1,050,200-point performance he registered at a "Mortgage Brokers" tournament.
"Based on the complete body of evidence presented in this official dispute thread", the company said in an official statement, "Twin Galaxies administrative staff has unanimously made a decision to remove all of Billy Mitchell's' scores as well as ban him from participating in our competitive leaderboards". But, Twin Galaxies puts the score up anyway, sending Steve Wiebe home packing. Wiebe initially beats Mitchell's previous Donkey Kong score and becomes the first person to document a million-plus score on an original arcade machine.
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The main reason for this is his suspected use of MAME (emulation software) to achieve his scores, as opposed to using original arcade hardware. Twin Galaxies had this to say. This kind of extensive testing is beyond the scope of the dispute case needs.
Throughout every step of this investigation, Billy Mitchell had the opportunity to answer questions and contribute to the public dispute thread. In Twin Galaxies, however, they allow MAME to be used on a program called WolfMAME.
Billy Mitchell held many world records and some for a very long time that was still unbeaten.
The ban has no effect on the current world record in Donkey Kong, which now sits at the 1.247 million points set by Robbie Lakeman in February. More recently, however, his scores have come under increased scrutiny.
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Thanks again to all who contributed time, effort and expertise to this case.