Included with the Switch port of Super Mario 3D World, Bowser’s Fury reuses all the power-ups, enemies and gimmicks from that game but adds cat ears to literally everything and gives you a fully controllable camera. It’s also one complete open world, a bit like an extra large Super Mario Odyssey level.
Bowser has gone out of control, and you need to collect Cat Shines to keep him in check. Every so often he rises from the black goo that covers the world, tried to kill you, and you send him back with the shines. As you collect more shines, you reveal more areas by getting rid of the goo.
Working in two player mode, with my daughter as Bowser Jr (who is concerned his dad is a bit too evil now), we collected all 100 Cat Shines in a few hours. It’s not a massive game, but it is excellent and something new in the Mario world.