You start off controlling mario, who is looking for hs donut which he lost. Eventually, Mario finds Luigi, who tells Mario that evil guy is back. Mario ignores him, beats up Wario and gets his donut back. But the donut turns out to be F***ing Magical or Something. The donut forces them to team up and take down evil guy, and also gives them super powers. The Quartet then go and collect 4 golden cupcakes and use them to powerfully power up their powerful powers and smash evil guy through the Fourth Wall. Evil Guy will come back and eats them all. if you don't complete anything in this game, The game ends with Evil Guy laughing evily. if you complete anything in this game, you get to fight Evil Guy. After a long and hard battle that leaves Evil Guy snarling in pain, Mario recovers the golden cupcakes and Evil Guy Dies. To celebrate, Luigi throws an party a few days later with a parade, featuring characters from the whole game.
Bassically, you just walk around until monters jump out and randomly challenge you to a fight to the death. Each of the characters can use stuff to kill monsters, as well as plungers and Mexican Dwarf Mushrooms.
It is almost impossible to beat The King, despite him being the most laziest person in Hyrule.
There is no speghetti in this game,despite it being called Final Spaghetti.