Mario & Sonic (Platformer)

Mario & Sonic (Platformer) (tentative name) is a theoretical game that combines concepts from the Super Mario & Sonic the Hedgehog series.

Premise
After being faced with rumors of Mario/Rabbids RPG, Kay, Apallo, and I began discussing the potential of a Mario/Sonic platformer. It's long been said that Nintendo/Sonic Team/whomever have said that they don't have any ideas on how a crossover could work.