Close your eyes and picture it: warm sunshine, waves lapping gently at the shore, and seagulls drifting lazily across a clear blue sky. This is Isle Delfino — a glittering island resort far from the bustle of the Mushroom Kingdom, where Mario, Peach, and a group of Toads have come to relax and unwind. At least, that was the plan. When they arrive, they find the island in chaos: according to the locals, someone with a round nose, a thick mustache, and a cap has been spreading pollution everywhere and causing the island's energy source, the Shine Sprites, to vanish. The trouble is, that description sounds exactly like Mario himself. Falsely accused, Mario vows to clean up the island and clear his name — and luckily, he has help in FLUDD, the latest invention from Gadd Science, Inc., a water-spraying device that lets him wash away the mess, fend off enemies, and wriggle out of all sorts of sticky situations. Can Mario scrub the island clean, catch the real culprit, and prove his innocence?