Super Mario 420 is likely a ROM hack of Super Mario 64 with altered content referencing the number 420, often associated with cannabis culture. This ROM hack likely contains altered textures, models, or level designs incorporating this theme. This is not an official Nintendo product and was created by ROM hackers. The core gameplay would still resemble Super Mario 64's platforming elements but with the thematic additions.

Super Mario 420

Super Luigi 64 - Definitive Edition