I aquired what I assume is the only Marble Madness Prototype Cartridge and managed to beat it. Sadly, it doesn't have the missing levels : r/Gameboy
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![Game Boy Longplay [109] Marble Madness - YouTube](https://i.ytimg.com/vi/ORhbr--1eyU/hqdefault.jpg "Game Boy Longplay [109] Marble Madness - YouTube")
Game Boy Longplay [109] Marble Madness - YouTube
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