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DISCLAIMER: I am not affiliated to Underbros Animaci贸n, the original creators of the animation, nor to Team Sanos, the official developers of the Underbros fangame. This is purely an UNOFFICIAL recreation.

What happens when you tinker with the game's files and decide to replace the short skeleton?

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UNDERBROS is an alternate universe in which the player's actions of changing Sans to Nintendo's famous plumber, Mario, causes the whole world to shift to a Mario-focused take of UNDERTALE. This fangame specifically tackles the animation of the Mario fight found in the Genocide route.


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  • Underbros Animaci贸n for creating the animation that is the entire basis of this project, the human designs and sprites, as well as Mario's overworld sprite, used below.

  • KatelynnTheG for making Sandy's sprites, used below.

  • NotHobo_FN for translating the original animation.

  • PixelatedEngie (PixelCrusher10 on DeviantArt) for Mario's sprite.

  • esquii and Siegfried for composing Tears in the Rain.

  • Kibo for composing Strength of Will.

  • Toby Fox for creating UNDERTALE and composing the remainder of the songs.

  • Nintendo for creating and owning the Super Mario franchise.

  • The UndertaleModTool, the subreddit Underminers and @Short_Monqey for their help on developing the engine.

  • AverageDeku, Mr Oofity, @TheKiddo and Evann for playtesting the engine.

  • @AITYunivers (and @Uppernate to an extension) for creating the GameJolt API for Clickteam.

  • Clickteam for allowing me to create this (and be a hassle to deal with floats).

  • Me for the rest (coding, remaining assets, additional dialogues.)

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#undertale #action #fangame #rpg #mario #underbros #bullethell



teen
Cartoon Violence
Animated Bloodshed

Devlog#0 - INTRODUCTION - February 22, 2026