Finding a "free download" for a ROM hack often leads to pre-patched files, which are legally problematic as they include copyrighted Nintendo code. To play legally and safely, the community standard is to use a :
: You must own a legitimate copy of Mario Kart DS and dump your own ROM file. mario kart ds gamecube grand prix rom download free
(GCGP) is a fan-made ROM hack that aims to faithfully port the tracks, music, and aesthetic of the 2003 classic Mario Kart: Double Dash!! to the Nintendo DS hardware. Finding a "free download" for a ROM hack