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The Backrooms Project Delta (Discontinued)Minecraft modpack for 1.21.1

A large Minecraft Backrooms map where you play as a scientist named James Rider who falls into the Backrooms...

newest supported release 1.21.1HorrorExtra LargeHardcoreMap Based
Latest version
The Backrooms-Project Delta-v5.0
Minecraft
1.21.1
Java
Java 21+
Loader
Fabric
Licence
not stated
Downloads
3.6k
Updated
2 mo ago
Available on
CurseForge
Space NodeOur hosting

Host The Backrooms Project Delta (Discontinued) servers

One click and The Backrooms Project Delta (Discontinued) is installed with the right loader, on hardware built for it.

  • 1.21.1
  • 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 The Backrooms Project Delta (Discontinued) declares support for, newest first, with the Java runtime that version needs.

Other modpacks
MinecraftThroughJavaEvidenceReleased
1.21.1Fabric21+declared8 Aug 2024

Download

From The Backrooms Project Delta (Discontinued)’s own host. Nothing is re-hosted here.

Most recently published release

The Backrooms-Project Delta-v5.0release11 Sept 2026

The Backrooms-Project Delta-v5.0.zip · 473.2 MB · for 1.21.1 · Fabric

Download this release
0476678031f3…
Older versions6
  • The Backrooms-Project Delta-v4.029 May 20261.21.1295.7 MB28 downloadsae804ff001bb…Get
  • The Backrooms-Project Delta-v3.026 Apr 20261.21.1242.0 MB488 downloadsa890754051d7…Get
  • The Backrooms-Project Delta-v2.117 Apr 20261.21.1234.1 MB25 downloadsb6cd3e9c4774…Get
  • The Backrooms-Project Delta-v2.015 Apr 20261.21.1238.5 MB55 downloadsbfeb857c6d73…Get
  • The Backrooms-Project Delta-v1.111 Apr 20261.21.1224.4 MB61 downloads96961158b5be…Get
  • The Backrooms-Project Delta-v1.03 Apr 20261.21.1224.4 MB145 downloads1b7bc8fd2496…Get

Frequently asked

Does The Backrooms Project Delta (Discontinued) work on Minecraft 1.21.1?

Yes. 1.21.1 is the newest Minecraft version The Backrooms Project Delta (Discontinued) 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 platform or loader does The Backrooms Project Delta (Discontinued) 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 The Backrooms Project Delta (Discontinued)?

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.

How do I install The Backrooms Project Delta (Discontinued)?

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 The Backrooms Project Delta (Discontinued) safely?

Start with the author's page on CurseForge, 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.香草精华 Vanilla EssenceFaithful to the origional. Better vanilla experience without any new blocks or mobs

Details from CurseForge, where the author last updated it on 11 Sept 2026. We do not host files or republish descriptions. Available download links point to the author’s own release.

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