Secret Veterans
How to Unlock: Clear 10-Man Smash under 25 seconds.
VS Match Unlocking Requirement: 20
Where you'll fight him: Paper Mario 2
How to Unlock: Clear Classic Mode on intensity 5.5 or higher without using a continue.
VS Match Unlocking Requirement: 40
Where you'll fight him: Hyrule Upheaval
How to Unlock: Clear Master Orders on Hard.
VS Match Unlocking Requirement: 64
Where you'll fight him: Bowser's Castle
How to Unlock: Clear Classic Mode on any intensity.
VS Match Unlocking Requirement: 5
Where you'll fight him: Corneria
How to Unlock: Clear Classic Mode without using a continue.
VS Match Unlocking Requirement: 10
Where you'll fight him: Pirate Ship
How to Unlock: Place 1st in Solo Smash Run.
VS Match Unlocking Requirement: 100
Where you'll fight him: Lylat Cruise
How to Unlock: Clear Crazy Orders after 10 rounds and defeat Crazy Hand.
VS Match Unlocking Requirement: 130
Where you'll fight her: Artifact Temple
Marth's Echo Fighter
How to Unlock: Clear 100-Man Smash.
VS Match Unlocking Requirement: 15
Where you'll fight her: Arena Ferox
How to Unlock: Clear Classic Mode on intensity 2.0 or higher with 10 characters.
VS Match Unlocking Requirement: 175
Where you'll fight him: Flat Zone X
How to Unlock: Collect 250 unique Trophies.
VS Match Unlocking Requirement: 50
Where you'll fight him: Gyromite
How to Unlock: Unlock 10 characters.
VS Match Unlocking Requirement: 225
Where you'll fight it: Saffron City
Pit's Echo Fighter
How to Unlock: Win Solo Squad Strike.
VS Match Unlocking Requirement: 110
Where you'll fight him: Reset Bomb Forest
How to Unlock: Get 1 or more KOs in Cruel Smash.
VS Match Unlocking Requirement: 200
Where you'll fight them: Duck Hunt
Secret Newcomers
Bowser's Echo Fighter
How to Unlock: Hit more than 1000 ft. in Home-Run Contest.
VS Match Unlocking Requirement: 120
Where you'll fight him: Luigi's Mansion
How to Unlock: Destroy 50 Blocks in Trophy Rush.
VS Match Unlocking Requirement: 180
Where you'll fight him: Hyrule Castle
How to Unlock: Clear All-Star Mode on Normal.
VS Match Unlocking Requirement: 25
Where you'll fight her: Gang-Plank Galleon
How to Unlock: Place 1st in Solo Smashdown.
VS Match Unlocking Requirement: 30
Where you'll fight it: Pokemon World Tournament
How to Unlock: KO your Rival once and get 25 or more KOs in Rival Smash.
VS Match Unlocking Requirement: 75
Where you'll fight him: Central City
Inkling's Echo Fighter How to Unlock: Collect 88 CDs. VS Match Unlocking Requirement: 88 Where you'll fight her: Moray Towers
Alvin's Echo Fighter
How to Unlock: Get a score of 130000 in Target Blast.
VS Match Unlocking Requirement: 150
Where you'll fight him: Cyber Metropolis
How to Unlock: Place 1st in Solo Smash Run with 5 characters.
VS Match Unlocking Requirement: 250
Where you'll fight him: Mechanical Island
Secret New Stages
- Subspace - Super Smash Bros. Brawl (How to Unlock: Clear Event Match.)
- Bowser's Castle - Super Mario (How to Unlock: Unlock Bowser Jr.)
- Paper Mario 2 - Paper Mario (How to Unlock: Collect 50 unique Trophies.)
- Gang-Plank Galleon (Stage Boss: King K. Rool) - Donkey Kong Country (How to Unlock: Hit more than 2500 ft. in Home-Run Contest.)
- Artifact Temple (Stage Boss: Meta Ridley) - Metroid Prime (How to Unlock: Play on all 3 Target Blast stages.)
- Gyromite - Gyromite (How to Unlock: Perform Guided Robo Beam [R.O.B.'s Final Smash].)
- Mechanical Island (Stage Boss: Phantom Meta) - New Valver Heroes (How to Unlock: Place 1st in Solo Smash Run as Alvin.)
- Flipnote Studio - Flipnote Studio (How to Unlock: Get 100 KOs in 3-Minute Smash as Alvin.)
- Nintendo Land - Nintendo Land (How to Unlock: Clear the True All-Star Mode on Normal.)
- Tetris - Tetris (How to Unlock: Unlock 15 Stages.)
Secret Returning Stages
- Meta Crystal - Super Smash Bros. (64) (How to Unlock: Clear Classic Mode on intensity 7.5 or higher.)
- Super Mario Maker - Super Mario Maker (Smash 4) (How to Unlock: Create 3 Stages in the Stage Builder.)
- Kongo Jungle - Donkey Kong Country (64) (How to Unlock: Clear All-Star Mode.)
- Hyrule Castle - The Legend of Zelda (64) (How to Unlock: Get 120 KOs in Endless Smash as Link.)
- Pirate Ship - The Legend of Zelda: The Wind Waker (Brawl) (How to Unlock: Unlock Toon Link.)
- Dream Land - Kirby (64) (How to Unlock: Perform Ultra Sword [Kirby's Final Smash].)
- Fountain of Dreams - Kirby's Adventure (Melee) (How to Unlock: Place 1st in Solo Smash Run as Kirby.)
- Dream Land GB - Kirby's Dream Land (Smash 4 3DS) (How to Unlock: Clear Boss Battles on Normal or higher.)
- Saffron City - Pokémon Red & Pokémon Blue (64) (How to Unlock: Unlock Jigglypuff.)
- Big Blue - F-Zero (Melee) (How to Unlock: Perform Blue Falcon [Captain Falcon's Final Smash].)
- Magicant (Stage Enemy: Flying Man) - EarthBound Beginnings (Smash 4 3DS) (How to Unlock: Play as Ness 5 times.)
- Arena Ferox - Fire Emblem Awakening (Smash 4 3DS) (How to Unlock: Unlock Lucina.)
- Flat Zone X - Game & Watch (Smash 4 Wii U) (How to Unlock: Destroy 100 Blocks in Trophy Rush as Mr. Game & Watch.)
- Reset Bomb Forest - Kid Icarus: Uprising (Smash 4 3DS) (How to Unlock: Perform Dark Pit Staff [Dark Pit's Final Smash].)
- Garden of Hope - Pikmin 3 (Smash 4 Wii U) (How to Unlock: Perform End of Day [Olimar/Alph's Final Smash].)
- Duck Hunt - Duck Hunt (Smash 4) (How to Unlock: Unlock Duck Hunt.)
- Balloon Fight - Balloon Fight (Smash 4 3DS) (How to Unlock: Play as Villager 5 times.)
- Find Mii (Stage Boss: Dark Emperor) - Find Mii II (Smash 4 3DS) (How to Unlock: Place 1st in Solo Smash Run with 3 characters.)
- Tomodachi Life - Tomodachi Life (Smash 4 3DS) (How to Unlock: Collect 100 unique Trophies.)