Mario & Luigi: Undertale Mashup is a game that crosses over with Undertale, it is created by Pingy Animatronic.


When Mario & Luigi are roaming, they accidentally fell into the ground! So they must find their way back before it's too late!


  • The Ruins
  • Snowdin
  • Waterfall
  • Hotland
  • New Home


  • Bowser (Tutorial Fight)
  • Papyrus (Who tries to capture Mario, Luigi, and Frisk but is befriended by the Trio at the end of the boss fight)
  • Mettaton
  • Undyne the Undying
  • Jerry
  • Muffet
  • Kamek
  • Asgore
  • Bowsriel Dreemurr (Final Boss, when Bowser is possessed by Asriel Dreemurr)

Battle Ring

  • Papyrus X
  • Mettaton X
  • Undyne the Undying X
  • Jerry X
  • Muffet X
  • Kamek X
  • Asgore X
  • Photoshop Flowey (secret boss fight when finishing the Battle Ring medley)

Differences from other Mario & Luigi games

  • Toriel replaces Toadsworth as the tutorial guide
  • Badges are still replaced by Battle Cards
  • Alphys gives bonus points to Mario, Luigi, and Frisk instead of Lakitu
  • Bosses have different themes
  • The game doesn't feature a Wiggler boss.
  • Players can Flee Boss fights.

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