MarioVania: Simpleny of the Night is a Nintendo 64 fan game combining elements of Mario and Castlevania. Its origins and development history are largely undocumented except within ROM hacking communities. Gameplay likely features exploration, platforming, and combat reminiscent of Castlevania's "Metroidvania" style within a Mario-themed universe. Created independently of Nintendo, it is a testament to the inventive spirit of fan game development.

MarioVania: Simpleny of the Night 

Mario's Mafia Misadventure