UNDERTALE Boss Battle Simulator (JERRY)

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UNDERTALE Boss Battle Simulator (JERRY)

Updated 12/29/2025: RETURN OF JERRY. (see more)

Originally published: 12/27/2025

UNDERTALE Boss Battles seen like never before!

(In Blocksmith)


AM ON BREAK. BE BACK IN A WEEK OR SO.


ACHIEVEMENTS: #2 Most Popular and #3 Trending just one day after release!


A game intended to bring you a version of UNDERTALE on the Blocksmith platform!

Please note that, though I try my best, there may yet be glitches.

More bosses made every so often. I'll try for roughly one a week.

Thanks for reading!

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TUTORIAL:

Feel free to skip this if you have played UNDERTALE.


In this game, you must select a character to battle. Don't let you character be hit by attacks.

Attack Types:

  • RED: These attacks deal damage if you touch them. Don't touch red!
  • BLUE: These attacks do not deal damage if you stand still. Don't move while touching a blue attack.
  • GREEN: These attacks are not really much of an attack. They heal you if you touch it.

More are to come.

That is sort of all you need to know for now. Stay DETERMINED. Don't give up.

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OH!!! AND ONE MORE THING!!!

A soundtrack is coming out for this at some point. Not like an official one or anything, but I will make some music for the fights as soon as I can. :D


Not affiliated with UNDERTALE by Toby Fox. This is just a fangame.

Original: maze

Based on: 2D Maze Game Example

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    I make the Evil Egg series, the well-loved Cat and Mice, and such and such. I would appreciate a look through my creator page, as I have something for just about everyone. Maybe. If you choose to take a look, the simplest way is just clicking on my name.

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