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Stage Unlock: Battlefield Stage
To unlock the Battlefield stage, complete the All-Star 1-P mode for the first time.Stage Unlock: Big Blue Stage
To unlock the Big Blue stage, you must play at least 150 matches in VS. mode (without quitting).Stage Unlock: Brinstar Depths Stage
To unlock the Brinstar Depths stage, you must play at least 50 matches in VS. mode (without quitting).Stage Unlock: Dream Land Past Stage
To unlock the Dream Land stage of the past, beat Target Test with all characters, regular and hidden.Stage Unlock: Final Destination Stage
To unlock the Final Destination stage, you must complete all 51 Event Matches.Stage 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.Stage Unlock: Fourside Stage
To unlock the Fourside stage, you must play at least 100 matches in VS. mode (without quitting).Stage Unlock: Kongo Jungle Stage
To unlock the Kongo Jungle from the N64 version of this game, complete the 15-Minute Melee. I'd recommend using Donkey Kong and constantly use his Down + B move the entire time (thanks to DEngel's Secrets guide, for I used that strategy to unlock this myself)!Stage Unlock: Mushroom Kingdom II Stage
To unlock the Mushroom Kingdom II stage, which is from Super Mario Bros. 2 on the NES, simply collect a Birdo trophy. The trophy is random, but when you find/win it, you get this stage.Stage Unlock: Poké Floats Stage
To unlock the Poké Floats stage, you must play at least 200 matches in VS. mode (without quitting).Switch to: Characters or Trophies