The game takes place on the tropical Isle Delfino, where Mario, Toadsworth, Princess Peach, and five Toads are taking a vacation. A villain resembling Mario, known as Shadow Mario, vandalizes the island with graffiti and causes Mario to be wrongfully convicted for the mess. Mario is ordered to clean up Isle Delfino, using a device called the Flash Liquidizer Ultra Dousing Device (F.L.U.D.D.), while saving Princess Peach from Shadow Mario.
The game takes place on the tropical Isle Delfino, where Mario, Toadsworth, Princess Peach, and five Toads are taking a vacation. A villain resembling Mario known as Shadow Mario, vandalizes the island with graffiti and causes Mario to be wrongfully convicted for the mess. Mario is ordered to clean up Isle Delfino, using a device called the Flash Liquidizer Ultra Dousing Device (F.L.U.D.D.), while saving Princess Peach from Shadow Mario.