Double Donkey Kong is an unofficial hack afaik. I think mikesarcade sells the kits. There is no assurance that game code wasn't modified when it was made which I'm sure is why it was rejected. Or if the kit adds more ram or something, might make it run .00001 differently, who knows. What I'm saying though is unless they dump the roms and check the crcs, I could literally walk into Twin Galaxies with a hacked board and they wouldn't know. The roms don't have labels over the windows so you could erase them with UV light and reprogram them to a hacked, easier version and the board wouldn't change physically. I doubt Walter walks around with an eprom programmer but maybe they have done some upgrades since I last checked.
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