To beat the Great maze and unlock the final battle with Tabuu, the ruler of Subspace, you but do both:
Beat the possessed characters
Beat every boss
to find out how many people you need, after beating Dark DK, a bunch of undefeated people with appear. when you defeat them all, a gateway showing Tabuu's wings appear. go to the middle of the room to face the mighty Tabuu
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I think you must defeat every shadow character and boss in The Great Maze.
To get to level 5 you must complete level 4 in scary maze game
You get to the Middle of the maze and go against the dude with the wings.
There are gears on the floor and when you step on the buttons they turn
Complete Classic on Hard difficulty with any character and any amount of stock.