A friend said you could unlock the metal box as an item, play as Master Hand (also play as some kind of twitchy hand.... never heard of him), and play as Goku, Vegeta, and that purple guy. How do you do these? The ones I do know are....

You can play as Lucas by beating 1P mode as Ness in VERY HARD with 3 or less lives. You can play as Wario by finding some cheat where all 4 Marios are Wario-clothed, then after that 1P must win against 3 level 9 Wario-Marios teamed against him. Then Wario appears.... You can also play as Jumpman by fighting a level 9 Donkey Kong and Mario as Jigglypuff (and no he's not 2-D).

MOVESETS

LUCAS

Special: PK Fire
Up Special: PK Thunder
Down Special: PSI Magnet

WARIO

Special: Bike Toss
Up Special: Flight Fart
Down Special: Super Fart-splosion

JUMPMAN

Special: Hammer(kinda like Kirby's in SSBR)
Up Special: Jump-over (the higher the points that appear above Jumpman's head, the more damage they do when they attack whoever you jumped over)
Down Special: Cranky Kong (he becomes Cranky Kong and throws 3 very damage-y barrels)