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modpack

UndertaleMinecraft modpack for 1.21

Minecraft Full Undertale map Experience (Part 1-2)

client and servernewest supported release 1.21TechnologyAdventureOptimizationChallenging
Latest version
0.0.5
Minecraft
1.21
Java
Java 21+
Loader
Fabric
Licence
LicenseRef-All-Rights-Reserved
Downloads
141.9k
Updated
17 mo ago
Available on
Modrinth
Space NodeOur hosting

Host Undertale servers

One click and Undertale is installed with the right loader, on hardware built for it.

  • 1.21
  • Fabric
  • One click modpack install
  • Dependencies handled
  • Tuned startup flags
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

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 declares support for, newest first, with the Java runtime that version needs.

Other modpacks
MinecraftThroughJavaEvidenceReleased
1.21Fabric21+declared13 Jun 2024

Download

From Undertale’s own host. Nothing is re-hosted here.

Most recently published release

0.0.5release23 May 2025

Undertale 0.0.5.mrpack · 92.3 MB · for 1.21 · Fabric

Download this release
dc24c07fbcf9…
Older versions2
  • 0.0.32 May 20251.2182.1 MB1.4k downloads66407f4c688d…Get
  • 0.0.021 Apr 20251.21108.9 MB832 downloadsfe6b830cf696…Get

Frequently asked

Does Undertale work on Minecraft 1.21?

Yes. 1.21 is the newest Minecraft version Undertale declares support for, and the claim comes from the author's own release metadata rather than from a compatibility list somebody maintains by hand.

Do I need to install Undertale 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 support?

Fabric. 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?

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 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?

Use a launcher that imports packs, such as Prism Launcher, the Modrinth App or the CurseForge app, and open the pack file with it. The launcher installs the right loader and mods for you; installing a pack's mods by hand is the error-prone way.

Where do I download Undertale 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.

Re-ConsoleA continued Legacy Console Edition experience, expanded upon with modern Java Edition content and QoL! (An Official Legacy4J Project)MAX FPS: Optimized🚀 MAX FPS WITHOUT UNNECESSARY MODS! Only 16 optimization mods - NOTHING EXTRA! ✅ ALL MAJOR VERSIONS ⚡ INSTALLS ON ANY LAUNCHER! (Guide below)Simply Optimized ReloadedAn unofficial port of Simply Optimized built to support every major mod loader and stay current with the newest versions of Minecraft.PacktrixPre-packed Official Modpack containing Patrix Resource Pack for easy install using Fabric/Quilt.FPS+ PvP Boost | Ultimate FPS & Combat Client [ Every Version ]Ultra-lightweight FPS boost & PvP modpack for Fabric. Boost FPS on low-end PCs with Sodium optimizations, lower input lag, cleaner visuals, and combat HUD tweaks built for Hypixel Bedwars, Duels, PotPvP & CPVP. Maximize frames and dominate fights.ElixirA well-researched performance & optimization modpack to make the game run smoother! With shader & Fresh Animations support. 26.3 ✔

Details from Modrinth, where the author last updated it on 23 May 2025. We do not host files or republish descriptions. Available download links point to the author’s own release.

Is this information wrong or missing something? .