I usually write off Mario & Sonic at the Olympic Games titles. It's not that I don't try them: I do! But the vast majority are mere diversions in an attempt to partake in that very lucrative Olympics budget. This time though Sega is scaling things down a bit with just a Switch release, and amazingly, a huge focus on retro games.
Although Mario and Sonic have already met in Super Smash Bros. (and the billions of aforementioned Olympics mashups), there's something joyous about seeing their retro incarnations together. "For the first time in series history," Sega is including "classic 2D events" in the mix with the typical 3D motif.