Their is no cheat to unlock all the characters all at once.Only cheats to get the characters seperatly.
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Be being smart
Sonic Underground is an animated TV series. And no, you cannot unlock episodes, or characters other than Sonic, from Sonic Underground in Super Smash Bros Brawl.
There are no cheat codes for brawl.
35 characters are in super smash bros brawl
There are 35 playable characters in Super Smash Bros Brawl.