There are no levels in Super Smash Bros.
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you ll find out once the games out
You cant find it here but you should google it by typing in "how do i unlock all the characters in super smash bros. melee" and click on the one at the top you should be on Gamespot.com when you click on it. When you get there scroll down and you found it.
Taboo is only a boss character and you can fight him in the Subspace Emissiary or in the Boss Battle mode.
you have to do 350 battles. Finish the subspace emissary mode then go to the swamp level find a secret door in the area after giant diddy then defeat jigglypuff.
Helpers are other game characters that can help you fight in a battle. You can find them in assist trophies. Just pick it up and it will break out and fight.