However, his expertise came into question earlier this year as evidence shows that he was cheating using an emulator to attain high scores.
"The rules for submitting scores for the original arcade Donkey Kong competitive leader boards requires the use of original arcade hardware only", the organization said in a statement.
Mitchell has promised to prove his scores are valid. The Guinness World Records organization quickly followed suit, but Mitchell isn't stepping down quietly. The registry was founded by Walter Day in1982 and has always been recognized as a reputable source of verified high scores by the gaming community and by the Guinness Book of World Records.
There's no denying that Mitchell is a ridiculously skilled video game player, his ideal Pac-Man score is a mind-boggling feat of memory, patience and pixel-perfect control, but, as this situation continues, the Floridian native risks this recent revelation becoming the defining mark for his entire gaming career. Throughout Twin Galaxies' review process, Mitchell held his tongue even though he had the opportunity to defend himself. The gamer questioned whether Mitchell earned the marks on an arcade machine.
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Instead of admitting any wrongdoing after the verdict was passed, Mitchell instead released his own video at the Midwest Gaming Classic show claiming that not only are his scores real, but he's gathering evidence to prove his case.
Mitchell is one of the highest-profile gamers in the world because of his list of records. He also was featured in the 2007 documentary "The King of Kong: A Fistful of Quarters".
While Mitchell making a new attempt at the Donkey Kong world record would have been a more entertaining, if dramatic response, this story clearly isn't over just yet. In it, he said due diligence is being done on an investigation in "a professional manner, not in a shock-jock mentality designed to create hits".