- Latest version
- 2.02
- Minecraft
- 1.20.1 to 1.21.1
- Java
- Java 21+
- Loaders
- Forge, NeoForge
- Licence
- LicenseRef-All-Rights-Reserved
- Downloads
- 1.3k
- Updated
- 3 mo ago
- Available on
- Modrinth
Our hostingHost Undertale Additons servers
One click and Undertale Additons is installed with the right loader, on hardware built for it.
- 1.21.1
- Forge
- NeoForge
- One click mod install
- Loader matched for you
- Ryzen CPUs
- NVMe SSD
Screenshots
Click a screenshot to open it. Screenshots are served from the author’s own host and belong to them.
Minecraft versions
Every version Undertale Additons declares support for, newest first, with the Java runtime that version needs.
Download
From Undertale Additons’s own host. Nothing is re-hosted here.
Most recently published release
undertale_additions-2.0 beta 2-neoforge-1.21.1.jar · 0.3 MB · for 1.21.1 · NeoForge
eecab47612aa…Older versions11Hide older versions
- 2.0116 Jul 20261.21.10.2 MB11 downloads
29cfb16b1cc7…Get - 1.1.26 Nov 20251.20.11.1 MB321 downloads
656ad90b5cf7…Get - 1.1.113 Oct 20251.21.10.9 MB10 downloads
325570bfa556…Get - 1.0.15 Oct 20251.20.11.0 MB38 downloads
eee873ae89b0…Get - 1.0.08 Sept 20251.21.10.8 MB25 downloads
1d8c05fc020f…Get - 0.0.629 Aug 20251.21.10.7 MB34 downloads
5ace8ee6a042…Get - 0.0.526 Aug 20251.21.10.5 MB17 downloads
994d7256ba29…Get - 0.0.425 Aug 20251.21.10.3 MB20 downloads
8fc323f5dbb2…Get - 0.0.323 Aug 20251.21.10.2 MB20 downloads
d261f823b491…Get - 0.0.221 Aug 20251.21.199 KB22 downloads
c000a0d9ac53…Get - 0.0.119 Aug 20251.21.175 KB17 downloads
1117c1c974ab…Get
Frequently asked
Does Undertale Additons work on Minecraft 1.21.1?
Yes. 1.21.1 is the newest Minecraft version Undertale Additons declares support for, and the claim comes from the author's own release metadata rather than from a compatibility list somebody maintains by hand.
Which Minecraft versions does Undertale Additons support?
Everything the author has declared, from 1.20.1 up to 1.21.1. The full list is in the table above, with the Java runtime each version needs next to it.
Do I need to install Undertale Additons on the client or the server?
Both. Every player needs it installed and so does the server, so anyone joining without it will be refused.
Which platform or loader does Undertale Additons support?
Forge, NeoForge. A build for one platform or loader will not necessarily load on another, so this is the first thing to check before the Minecraft version.
Which Java version do I need for Undertale Additons?
Among the supported Minecraft releases above, the highest recorded requirement is Java 21 or newer. Use the requirement for the exact Minecraft version you run; previews and snapshots may differ.
What licence is Undertale Additons under?
LicenseRef-All-Rights-Reserved, as stated by the author on the platform we synced it from. Check the project's own page before redistributing or bundling it.
How do I install Undertale Additons?
Install the matching loader first, then put the downloaded file in your mods folder and start the game. The loader, the mod and Minecraft all have to be on the same version, which is the usual reason a mod does not appear in game.
Where do I download Undertale Additons safely?
Start with the author's page on Modrinth, which is where the data here is synced from. MCReference does not host or repackage files. When available, recorded download links go to the source for that release; verify the publisher, filename and any available checksum before running it.
Works on the same versions
Ordered by how much of the recent Minecraft version coverage overlaps, not by popularity.
Is this information wrong or missing something? .