User blog comment:Agentluke0322/RBoAT Bonus 1: Mario vs. Bowser/@comment-27614603-20190628200030

Yes, that last line is a Bowsette reference.

Anyway,

What upcoming game should I do a bonus battle for? Link's Awakening (Switch) Pokemon Sword and Shield Animal Crossing: New Horizons Luigi's Mansion 3 Other (please specify) Never do something like this ever again