I once played the C64 version of regular Mario Bros. It was a surprisingly good port.
this post was submitted on 17 Feb 2026
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The Great Giana Sisters
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.
I remember trying the C64 port a couple years ago, pretty incredible stuff that they managed to do