go though all shadow doors then do to the door that leads to tabu
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You get to the Middle of the maze and go against the dude with the wings.
in the great maze, when you press + or start. there are many different bowser heads in different locations, they are the different bosses you've fought and all of the brawl characters on the subspace emissary. when done with that, you go to the place that looks like the jungle to the purple arrow and enter the big door to fight tabuu and once you defeat him, you win.
Toon link can be unlocked after beating tabuu at the great maze then going back to the forest level and when you get past the first mini brawl you will soon find a red door that never was there before go in and toon link will appear defeat him and he will join your team save and quit and you will unlock him.
You beat every character and boss in brawl, then go to the middle of the Great Maze which should look like subspace and all that; go to the middle and press up like you would for a normal door. You should find Tabuu there Warning- he is very hard to beat even on easy mode but you will find out how to beat him
The simplest way is to defeat the Subspace Emissary. Oh, and about Toon Link, Jigglypuff, and Wolf, you have to go back to the Forest, Swamp, and the Ruins and find an extra door to defeat them. But then, you have to beat Tabuu, and the Great Maze. Good luck. Oh, and there ARE other ways, but I'm afraid you have to Google it. I believe you have to play Brawl multiple times and defeat a character to win. I don't know. Good luck with Tabuu.