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Mysterious Mountain LibMinecraft mod for 1.21.1

Library for MMF-Group's mod.

client and servernewest supported 1.21.1Library
Latest version
1.2.15-1.21.1
Minecraft
1.12.2 to 1.21.1
Java
Java 21+
Loaders
NeoForge, Forge
Licence
MIT
Downloads
1.8M
Updated
5 mo ago
Available on
Modrinth
Space NodeOur hosting

Host Mysterious Mountain Lib servers

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

  • 1.21.1
  • NeoForge
  • Forge
  • One click mod install
  • Loader matched for you
  • Ryzen CPUs
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Minecraft versions

Every version Mysterious Mountain Lib declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.1NeoForge, Forge21+declared8 Aug 2024
1.21Forge, NeoForge21+declared13 Jun 2024
1.20.4Forge, NeoForge17+declared7 Dec 2023
1.20.3NeoForge, Forge17+declared4 Dec 2023
1.20.2NeoForge, Forge17+declared20 Sept 2023
1.20.1Forge, NeoForge17+declared12 Jun 2023
1.20NeoForge, Forge17+declared2 Jun 2023
1.19.4NeoForge, Forge17+declared14 Mar 2023
1.19.2NeoForge, Forge17+declared5 Aug 2022
1.19Forge, NeoForge17+declared7 Jun 2022
1.18.2NeoForge, Forge17+declared28 Feb 2022
1.18.1NeoForge, Forge17+declared10 Dec 2021
1.12.2NeoForge, Forge8+declared18 Sept 2017

Download

From Mysterious Mountain Lib’s own host. Nothing is re-hosted here.

All 35 releases
1.2.15-1.21.1release5 Apr 2026

mysterious_mountain_lib-1.2.15-1.21.1.jar · 0.3 MB · for 1.21.1

Download latest
5fb321cd41dc…
Older versions24
  • 1.6.34-1.20.116 Feb 20261.20.10.3 MB94.3k downloadsa830ece1f13f…Get
  • 1.6.30-1.20.126 Oct 20251.20.10.3 MB97.0k downloads4031d0ba2de7…Get
  • 1.6.29-1.20.126 Oct 20251.20.10.3 MB2.0k downloads979aa085dbf5…Get
  • 1.6.28-1.20.126 Oct 20251.20.10.3 MB126 downloads8bb658127ecf…Get
  • 1.5.26-1.20.127 Sept 20251.20.10.3 MB28.1k downloadsd36927c61cc7…Get
  • 1.5.25-1.20.127 Sept 20251.20.10.3 MB90 downloads33ace5b40977…Get
  • 1.5.24-1.20.12 Sept 20251.20.10.3 MB68.9k downloadsf9aaa8f0e830…Get
  • 1.2.14-1.21.126 Aug 20251.21.10.3 MB132.9k downloadsad146bcbee71…Get
  • 1.5.23-1.20.115 Aug 20251.20.10.3 MB32.1k downloads384619e2f6c9…Get
  • 2.3.0-1.12.23 Aug 20251.12.20.3 MB82.0k downloadse3bb035ea636…Get
  • 1.5.22-1.20.116 Jun 20251.20.10.3 MB175.7k downloadsbe896ab0cad6…Get
  • 1.5.21-1.20.15 May 20251.20.10.3 MB70.9k downloads9f239a3807dd…Get
  • 1.5.19-1.20.13 Mar 20251.20.10.3 MB125.9k downloadsc7d64abc87c1…Get
  • 1.5.18-1.20.124 Feb 20251.20.10.3 MB4.8k downloads932aeb34c238…Get
  • 1.1.8-1.21.128 Oct 20241.21.10.3 MB69.0k downloads89563f6c781b…Get
  • 1.1.7-1.21.124 Oct 20241.21.10.3 MB290 downloads12f87f04a089…Get
  • 1.5.17-1.20.124 Oct 20241.20.10.3 MB100.1k downloads114eb66f7ccc…Get
  • 1.5.15-1.20.124 Oct 20241.20.10.3 MB1.6k downloads7138c5ce259e…Get
  • 1.1.6-1.21.124 Oct 20241.21.10.3 MB164 downloadsa2943dc04a36…Get
  • 1.0.2-1.21.122 Oct 20241.21.10.3 MB178 downloadse69f51e640d3…Get
  • 1.0.1-1.2113 Sept 20241.21, 1.21.10.3 MB16.1k downloadsc80f49fae312…Get
  • 1.4.7-1.20.110 Jun 20241.20.10.3 MB83.7k downloads6addfcf7168a…Get
  • 1.4.7-1.18.210 Jun 20241.18.20.3 MB29.5k downloadsfb26816548b1…Get
  • 1.4.5-1.20.131 Mar 20241.20.10.3 MB118.6k downloadsf9ba4a19a121…Get

Frequently asked

Does Mysterious Mountain Lib work on Minecraft 1.21.1?

Yes. 1.21.1 is the newest Minecraft version Mysterious Mountain Lib 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 Mysterious Mountain Lib support?

Everything the author has declared, from 1.12.2 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 Mysterious Mountain Lib 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 loader does Mysterious Mountain Lib need?

NeoForge, Forge. A build for one loader will not load on another, so this is the first thing to check before the Minecraft version.

Which Java version do I need for Mysterious Mountain Lib?

On the newest Minecraft release it supports, Java 21 or newer. The requirement comes from the Minecraft version you run rather than from the mod itself, so on an older supported Minecraft the answer is that version's Java, not this one.

What licence is Mysterious Mountain Lib under?

MIT, 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 Mysterious Mountain Lib?

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 Mysterious Mountain Lib safely?

From the author's own page on Modrinth, which is where the data here is synced from. MCReference never mirrors, re-hosts or repackages a file: every download button points at the original source, so you get exactly what the author published.

Works on the same versions

Ordered by how much of the recent Minecraft version coverage overlaps, not by popularity.

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Last checked 2 mo ago against Modrinth. We do not host files and we do not republish descriptions; every download link points at the author’s own release.

Is this information wrong or missing something? .