Mario In Clock Town is a fan-made concept combining elements from the Super Mario series and the Legend of Zelda: Majora's Mask. The gameplay would likely involve a 3D platforming experience within the Clock Town setting, possibly incorporating time-based mechanics from Majora's Mask.  Its hypothetical creators could be skilled ROM hackers or independent game developers seeking to blend unique game worlds. Its inspiration is the combination of Super Mario 64 and Majora's Mask.

Mario In Clock Town

Mario Builder 64