OneSlotChallenge
by FyrixxDS
OneSlotChallenge is a Fabric minigame that locks every inventory slot except the fifth, so a run is played from one usable slot.
What it does
The mod covers every inventory slot except the fifth with permanent barriers, leaving that single slot open. Items placed in the blocked slots cannot be removed, dropped or moved, so the player works from that slot for the whole run. The mod is built as a hardcore challenge for players who want to test their survival with a very small inventory. It runs on the client, so no server install is needed. Files exist for 1.21.4 only, with 1.0 for 1.21.4 as the latest file, and the code is under All rights reserved.
Key features
Single usable slot
Only the fifth inventory slot stays open, and every other slot is covered by a barrier.
Locked barriers
The blocked slots cannot be removed, dropped or moved, so the restriction holds for the whole session.
Hardcore survival
The mod is meant for players who want to test their survival with one slot of storage.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
How it compares
Hardcore Slots is a Fabric option for 1.21.1 that runs on client and server, under the MIT License and not open source. More Save Slots is a client-side Fabric mod for 1.21.11, released under the MIT License and not open source.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| OneSlotChallenge | Fabric | 1.21.4 | Client-side only | 2026-02-26 |
| Hardcore Slots | Fabric | 1.21.1 | Client and server | 2026-06-09 |
| More Save Slots | Fabric | 1.21.11 | Client-side only | 2026-04-12 |
Questions
Does OneSlotChallenge need to be installed on the server?
Which Minecraft version does OneSlotChallenge support?
In the catalog
OneSlotChallenge is one of 2,135 Minigame mods on ModsFinder, and one of 1,454 Minigame mods for Fabric. 17,979 mods support Minecraft 1.21.4.
Similar mods
What the author says
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!
Official listing
- Modrinth page
- modrinth.com/mod/oneslotchallenge
- Owner
- FyrixxDS
- Published
- 2026-02-26
- Updated on Modrinth
- 2026-02-26
- Facts verified
- 2026-10-15