Sadly, it was taken down by Nintendo according to this article.

Discovered from this video from Modern Vintage Gamer.

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[–] 5 points 8 months ago

Yes Great Giana Sisters was heavily influenced by Super Mario Brothers, but someone has semi-recently ported SMB1 itself to the C64, using code from the original NES ROMs. Modern Vintage Gamer did a video on it yesterday, which may have inspired OP.

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