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data pack

Nightmare ModeMinecraft data pack for 1.21.11

A datapack that expands on Minecraft's hard difficulty to make the game exponentially more difficult!

server onlynewest supported 1.21.11AdventureMobs
Latest version
V1.3.4-mod
Minecraft
1.20.2 to 1.21.11
Works with
NeoForge, Quilt, Forge, Fabric
Licence
CC-BY-NC-ND-4.0
Downloads
15.4k
Updated
9 mo ago
Available on
Modrinth
Space NodeOur hosting

Host Nightmare Mode servers

Deploy a server with Nightmare Mode already added to the world, on hardware built for it.

  • 1.21.11
  • Data pack
  • NeoForge
  • Quilt
  • Forge
  • One click install
  • Version matched
  • Automatic backups
  • 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 Nightmare Mode declares support for, newest first, with the Java runtime that version needs.

Other data packs
MinecraftThroughJavaEvidenceReleased
1.21.11Data pack, NeoForge, Quilt, Forge, Fabric21+declared9 Dec 2025
1.21.10Fabric, Quilt, NeoForge, Forge, Data pack21+declared7 Oct 2025
1.21.9NeoForge, Quilt, Forge, Fabric, Data pack21+declared30 Sept 2025
1.21.8Data pack, Quilt, NeoForge, Forge, Fabric21+declared17 Jul 2025
1.21.7Forge, Quilt, Data pack, NeoForge, Fabric21+declared30 Jun 2025
1.21.6Forge, Data pack, Fabric, NeoForge, Quilt21+declared17 Jun 2025
1.21.5Data pack, Quilt, NeoForge, Forge, Fabric21+declared25 Mar 2025
1.21.1Fabric, Quilt, NeoForge, Forge, Data pack21+declared8 Aug 2024
1.21Fabric, Quilt, NeoForge, Forge, Data pack21+declared13 Jun 2024
1.20.4Fabric, Quilt, NeoForge, Forge, Data pack17+declared7 Dec 2023
1.20.2Fabric, Quilt, NeoForge, Forge, Data pack17+declared20 Sept 2023

Download

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

V1.3.4-modrelease18 Dec 2025

nightmare-mode-V1.3.4-data.jar · 0.1 MB · for 1.21.11

Download latest
3c3267d79071…
Older versions22
  • V1.3.4-data18 Dec 20251.21.110.0 MB769 downloads621ab0b735b4…Get
  • V1.3.3-mod18 Dec 20251.21.9, 1.21.100.1 MB210 downloadsfdca2d3bc8d6…Get
  • V1.3.3-data18 Dec 20251.21.9, 1.21.100.0 MB117 downloads708850a74274…Get
  • V1.3.2a-mod26 Jul 20251.21.7, 1.21.80.1 MB730 downloads4fc629240144…Get
  • V1.3.2a-data26 Jul 20251.21.7, 1.21.80.0 MB424 downloadsb8ed0b71b724…Get
  • V1.3.1a-mod26 Jul 20251.21.60.1 MB120 downloads7ae73cd0dafe…Get
  • V1.3.1a-data26 Jul 20251.21.60.0 MB65 downloads314f8e1efdc8…Get
  • V1.3a-mod26 Jul 20251.21.50.1 MB219 downloads466fc8874088…Get
  • V1.3a-data26 Jul 20251.21.50.0 MB112 downloads13ae0dab8c4f…Get
  • V1.3.2-mod1 Jul 20251.21.70.1 MB192 downloads58ff8381bb5d…Get
  • V1.3.2-data1 Jul 20251.21.70.0 MB161 downloadsdc752a37cc29…Get
  • V1.3.1-mod1 Jul 20251.21.60.1 MB85 downloadse93c90e8484f…Get
  • V1.3.1-data1 Jul 20251.21.60.0 MB82 downloadsf1f8f4903f39…Get
  • V1.3-mod31 May 20251.21.50.1 MB254 downloads790cf4c3f73d…Get
  • V1.3-data31 May 20251.21.50.0 MB283 downloads76a6af2aa2bf…Get
  • V1.2.3-mod30 May 20251.21, 1.21.10.5 MB1.5k downloadsc37fbf8b35e7…Get
  • V1.2.3-data30 May 20251.21, 1.21.10.2 MB369 downloads2e152d2cef1a…Get
  • V1.2.2-mod14 Aug 20241.210.5 MB801 downloads84359a1e36ad…Get
  • V1.2.2-data14 Aug 20241.210.2 MB728 downloadsfaddf6a96730…Get
  • V1.2.1-mod12 Aug 20241.20.40.5 MB397 downloads16d8c680fd3b…Get
  • V1.2.1-data14 Dec 20231.20.40.2 MB948 downloadsdfed9ec91d01…Get
  • V1.210 Dec 20231.20.20.2 MB655 downloads53cd26c885fb…Get

Frequently asked

Does Nightmare Mode work on Minecraft 1.21.11?

Yes. 1.21.11 is the newest Minecraft version Nightmare Mode 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 Nightmare Mode support?

Everything the author has declared, from 1.20.2 up to 1.21.11. The full list is in the table above, with the Java runtime each version needs next to it.

Do I need to install Nightmare Mode on the client or the server?

The server only. Players join with an ordinary Minecraft client and install nothing.

What licence is Nightmare Mode under?

CC-BY-NC-ND-4.0, 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 Nightmare Mode?

Data packs install per world: put the downloaded file in that world's datapacks folder and run /reload, or add it when creating the world. No loader is involved. On a server, the world folder lives next to the server jar.

Where do I download Nightmare Mode 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.

TerralithExplore almost 100 new biomes consisting of both realism and light fantasy, using just Vanilla blocks. Complete with several immersive structures to compliment the overhauled terrain.Towns and TowersSpice up your world with new villages, pillager outposts, and even new ships!TectonicTerrain shaping brought to new heights, grander and more varied than ever before!Incendium LegacyA nether biome overhaul combined with challenging structures to conquer, unique weapons to obtain, and tricky mobs to defeat.GeophilicA subtle-ish overhaul of vanilla Overworld biomes! Reworked!TrekBored of vanilla structure generation? This pack is for you!

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? .