You just have to beat all the challengers that come.
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Their is no cheat to unlock all the characters all at once.Only cheats to get the characters seperatly.
Yes. Few as there are, some new characters will be unlocked in Brawl.
Nope. But if you use mugen and add all the characters from SSB, you get yourself a brawl mugen :)
35 characters are in super smash bros brawl
There are 35 playable characters in Super Smash Bros Brawl.