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CastleBlocksMinecraft mod for 1.21.1

Alternative to chunk claiming, build castles instead!

client and servernewest supported 1.21.1UtilityAdventureGame MechanicsDecoration
Latest version
1.0.14
Minecraft
1.16 to 1.21.1
Java
Java 21+
Loaders
NeoForge, Forge, Fabric
Licence
MIT
Downloads
16.5k
Updated
3 mo ago
Available on
Modrinth
Space NodeOur hosting

Host CastleBlocks servers

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

  • 1.21.1
  • NeoForge
  • Forge
  • Fabric
  • One click mod install
  • Loader matched for you
  • Ryzen CPUs
  • 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 CastleBlocks declares support for, newest first, with the Java runtime that version needs.

Other mods
MinecraftThroughJavaEvidenceReleased
1.21.1NeoForge, Forge, Fabric21+declared8 Aug 2024
1.21Fabric, NeoForge, Forge21+declared13 Jun 2024
1.20.4Forge, NeoForge, Fabric17+declared7 Dec 2023
1.20.3Fabric, NeoForge, Forge17+declared4 Dec 2023
1.20.2NeoForge, Forge, Fabric17+declared20 Sept 2023
1.20.1Fabric, NeoForge, Forge17+declared12 Jun 2023
1.20Forge, NeoForge, Fabric17+declared2 Jun 2023
1.19.4Forge, NeoForge, Fabric17+declared14 Mar 2023
1.18.2Forge, Fabric, NeoForge17+declared28 Feb 2022
1.18.1NeoForge, Forge, Fabric17+declared10 Dec 2021
1.18Fabric, NeoForge, Forge17+declared30 Nov 2021
1.16.5Forge, NeoForge, Fabric8+declared14 Jan 2021
1.16.4Forge, NeoForge, Fabric8+declared29 Oct 2020
1.16.3Forge, NeoForge, Fabric8+declared10 Sept 2020
1.16.2Forge, NeoForge, Fabric8+declared11 Aug 2020
1.16.1Forge, NeoForge, Fabric8+declared24 Jun 2020
1.16Forge, NeoForge, Fabric8+declared23 Jun 2020

Download

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

1.0.14release24 Jun 2026

castleblocks-1.0.14.jar · 63 KB · for 1.21.1, 1.21

Download latest
ead67a8a5e5f…
Older versions12
  • 1.0.1323 Jun 20261.21.1, 1.2163 KB11 downloads2079ac7e7b49…Get
  • 1.0.1220 May 20261.21.162 KB4.5k downloads51f6ee809ecf…Get
  • 1.3.312 Jun 20251.21.10.1 MB531 downloads5bdaf8a021bc…Get
  • 1.0.1111 Oct 20241.2159 KB166 downloadsc036255ab871…Get
  • 1.3.28 Jul 20241.210.1 MB1.7k downloadsa24064574393…Get
  • 1.3.124 Mar 20241.20.40.1 MB6.8k downloads35efa972627a…Get
  • 1.0.9.19 Oct 20231.19.456 KB130 downloadsd8403511f73b…Get
  • 1.0.99 Oct 20231.18.256 KB148 downloadsdaff4dd54423…Get
  • 1.0.8.19 Oct 20231.16.5, 1.16.4, 1.16.3, 1.16.2, 1.16.1 +1 more61 KB254 downloads49fca05d5209…Get
  • 1.3.09 Oct 20231.20.1, 1.200.1 MB987 downloads205d61367fd5…Get
  • 1.2.29 Oct 20231.19.40.1 MB125 downloadsb5f5bdc5ddfc…Get
  • 1.0.109 Oct 20231.20.1, 1.2062 KB148 downloads0717447c6c18…Get

Frequently asked

Does CastleBlocks work on Minecraft 1.21.1?

Yes. 1.21.1 is the newest Minecraft version CastleBlocks 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 CastleBlocks support?

Everything the author has declared, from 1.16 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 CastleBlocks 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 CastleBlocks support?

NeoForge, Forge, 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 CastleBlocks?

On the newest Minecraft version 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 CastleBlocks 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 CastleBlocks?

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 CastleBlocks 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. The download link goes to the source recorded for that release; verify the publisher, filename and checksum before running it.

Works on the same versions

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

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Details from Modrinth, where the author last updated it on 24 Jun 2026. 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? .