you can unlock mushroom kingdom if you beat master hand with all the charicters then play in all the areas and mushroom kingdom will be in your area place.
Also, there's an unlockable mode in the options: That's right, the items switch!(100 vs matches)
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the characters are the super smash brothers, its a game about them being against each other and fighting.
This is the list of all unlockables in V0.7: Black Mage- Play 10 Vs Matches they said they only had five new ones so black mage is the only unlockable other ways to get black mage battle peach and die
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.
Following Super Smash Bros. Brawl, there has been no other games announced in the series.
If there even is a new Super Smash Bros. game it will not be called Super Smash Bros. Brawl 2. Other Super Smash Bros. games have different titles like Super Smash Bros. Melee, but that came out 7 years before Brawl and 3 before the original so the new game might be in a while..