How do I install OneSlotChallenge?

Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. Download the .jar. Put it in the .minecraft/mods folder and launch that loader profile. Opens on Modrinth — not every file is mirrored on our own servers.

What Minecraft version does OneSlotChallenge work with?

The listing gives Minecraft 1.21.4. This is the version stated by the author or source site, not something we verified ourselves.

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OneSlotChallenge

by FyrixxDS · on Modrinth

A brutal hardcore mod that locks all inventory slots except the 5th. The remaining 35 slots are filled with permanent barriers. Survive with only one slot…

⬇ Download on Modrinth

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Only true professionals survive with just one slot! All inventory slots except the fifth are blocked by barriers. They can't be removed, dropped, moved, or used. The fifth slot is your only hope for survival. OneSlotChallenge – test your mettle!

Quick facts

Edition: Minecraft Java
File type: .jar
Minecraft version listed: 1.21.4
How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.

Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.

Verified by MCModsHub

Ships as OneSlotChallenge-1.1.jar — drop this file into the mods folder
Download size: 486 KB
Download link checked 21 Aug 2026 — working

These come from our own check of the pack file, not from the source page.

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