Unlock Battlefield Stage
To unlock the Battlefield stage, complete the All-Star 1-P mode for the
first time.
Unlock Big Blue Stage
To unlock the Big Blue stage, you must play at least 150 matches in VS.
mode (without quitting).
Unlock Brinstar Depths
To unlock the Brinstar Depths stage, you must play at least 50 matches in
VS. mode (without quitting).
Unlock Dream Land (N64)
To unlock the Dream Land stage of the past, beat Target Test with all characters,
regular and hidden.
Unlock Final Destination Stage
To unlock the Final Destination stage, you must complete all 51 Event Matches.
Unlock Flat Zone Stage
To unlock the Flat Zone stage, you must complete 1-P Classic mode at any
difficulty/stock with Mr. Game & Watch.
Unlock Fourside Stage
To unlock the Fourside stage, you must play at least 100 matches in VS.
mode (without quitting).
Unlock Kongo Jungle (N64)
To unlock the Kongo Jungle from the N64 version of this game, complete
the 15-Minute Melee.
Unlock Mushroom Kingdom II
To unlock the Mushroom Kingdom II stage which is more commonly known as
Subcon, simply collect a Birdo trophy
Unlock Poké Floats
To unlock the Poké Floats stage, you must play at least 200 matches in VS.
mode (without quitting).
Unlock Yoshi's Island (N64)
To unlock the original Yoshi's Island stage from the N64 version of the
game, use Yoshi and hit over 1,350 ft. in the Home-Run Contest.