Secrets of the Showdown is a Adventure game mode for Extreme Showdown. There are seven stories, one is default and the rest are unlockable. This is pretty much like Sonic Adventure, as you play one of the characters in the story and explore the HUB World. Note that you need to switch into a certain characters before you can enter the stage. Note in the next few stories, * means you must find them with the character or characters on the left. Also, this can be played with two players.

Story 1: CollisionEdit

HUB WorldsEdit

  • Mushroom Kingdom - Easy (Added Playables: Mario, Luigi*, Peach, Rosalina*, Bowser, Bowser Jr*)
  • Donkey Kong Island - Easy (Added Playables: Donkey Kong, King K. Rool*, Diddy Kong, Dixie Kong*)
  • Hyrule Kingdom - Easy (Added Playables: Link, Impa, Toon Link*, Zelda, Sheik, Ganondorf*)
  • Brinstar - Easy (Added Playables: Samus, Zero Suit Samus, Ridley*)
  • Yoshi's Island - Normal (Added Playables: Yoshi)
  • Dream Land - Normal (Added Playables: Kirby, King Dedede, Meta Knight*)
  • Corneria - Normal (Added Playables: Fox, Falco*, Krystal, Wolf*)
  • Pokemon City - Normal (Added Playables: Pikachu, Jigglypuff*, Charizard, Mewtwo*, Greninja, Lucario*)
  • Arena Ferox - Hard (Added Playables: Marth, Ike*, Robin, Tiki)
  • Weyard - Hard (Added Playables: Matthew)
  • Reset Bomb Forest - Hard (Added Playables: Pit, Palutena*)
  • Magicant - Hard (Added Playables: Lucas, Ness*, Porky*)
  • Mute City - Very Hard (Added Playables: Captain Falcon, Black Shadow*)
  • WarioWare - Very Hard (Added Playables: Wario)
  • Flat Zone - Very Hard (Added Playables: Mr. Game & Watch*)
  • Distant Planet - Very Hard (Added Playables: Olimar)
  • Gyromite - Intense (Added Playables: R.O.B*)
  • Main Street - Intense (Added Playables: Villager)
  • Boxing Ring - Intense (Added Playables: Little Mac, Excitebiker*)
  • Icicle Mountain - Intense (Added Playables: Ice Climbers, Takamaru, Shulk*, Sukapon, Chibi-Robo)
  • Station Square - Supernova (Added Playables: Sonic, Mega Man*, Pac-Man*)
  • Collision Showdown:
    • ​Easy Collision - Supernova (Playables: Luigi, Rosalina, Bowser Jr, King K. Rool, Dixie Kong, Toon Link, Ganondorf, Ridley, Meta Knight, Falco, Wolf, Jigglypuff, Mewtwo, Lucario, Ike, Palutena, Ness, Porky, Black Shadow, Mr. Game & Watch, R.O.B, Excitebiker, Shulk, Mega Man, Pac-Man)
    • Supernova Collision - Supernova (Playables: Mario, Peach, Bowser, Donkey Kong, Diddy Kong, Link, Zelda, Sheik, Impa, Samus, Zero Suit Samus, Yoshi, Kirby, King Dedede, Fox, Krystal, Pikachu, Charizard, Greninja, Marth, Robin, Tiki, Matthew, Pit, Lucas, Captain Falcon, Wario, Olimar, Villager, Little Mac, Ice Climbers, Takamaru, Sukapon, Chibi-Robo, Sonic)

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