Kirby Battle Royale
This just came in today. I beat the Beginner's League in the story mode, which was...really easy (as expected) and nothing like the introduction level. The minigames are fun though, so far I've played Battle Arena, Apple Scramble, and Coin Clash (I also played Crazy Theater before in the demo).
I also played an online ranked match and actually found opponents pretty easily, contrary to how critics often make it out to be. I got to try out Meta Knight since I played the demo previously, and he's pretty fun to use.