FNF Insanity Unleashed vs Insanity Sans
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FNF Insanity Unleashed vs Insanity Sans


A mod of Friday Night Funkin where Boyfriend rap-battle against some crazy and insane version of Sans from Undertale.

Important Note: Remember, this is a mod made for fun, maybe it’s not so “attached” to the Insanity lore, but at least let’s have some fun listening to the music and appreciating the people who worked on this.

Which Insanity Sans do you think is the most crazy?


  • Insanity
  • Bloodshed
  • Lonely
  • SkullF***
  • Universal Destroyer
  • Listen to the entire OST on soundcloud

vs Characters:

  • Insanity Sans: 
    • Insanity Sans is an psychopath version of Sans created by Zero DanteeroAfter being infected by one of Gaster’s experiments, Sans completely loses his mind and becomes a murderer.
  • Renewed Sans: 
    • He is an interpretation of the aforementioned character made by SoilingQuasar It’s a Sans who has been left alone being that for some strange reason, everyone seems to have disappeared out of nowhere Loneliness drives him to a point of insanity and possible schizophrenia, making poorly made puppets of his own missing friends.
  • Insanity!Tale Sans:
    • He is the main character of the AU named “Insanity!Tale” which became insane after being chased by the first human after the genocide route, and having killed several humans to gain LOVE and EXP.
      After being able to defeat that human and escape from his timeline, he dedicates himself to breaking into and destroying other universes.

Mod Credits:

If you had fun and would like to keep up-to-update on the mod, make sure to support mod creators anyway you can like on their social media by subscribing, following, liking, etc.


  • Get the mod for your cool PC here

Game Engine:

  • Shadow Mario: Main Programmer
  • bbpanzu: Additional Programmer
  • RiverOaken: Main Artist/Animator
  • Also everyone that contributed on GitHub.

Original FNF Credits:

  • ninja_muffin99 – Programming
  • PhantomArcade3k and evilsk8r – ARTISTS
  • kawaisprite – TASTY MUSIC
  • AND everyone that contributed to the GitHub source.

The goal of this web optimized port is to make FNF and this mod more accessible to players that can’t otherwise play it on their potato PC, on a Chromebook,  on their Mac, on their Linux, or simply can’t run the EXE files on their computer.

If you want a challenge, turn off Ghost Tapping in the settings.

Recommend using Google Chrome to play FNF Mod for the best performance.

Jam to the beats and just have fun!