Slime Unfix
by HyperKNF
Slime Unfix restores the pre-1.21.2 behavior of slime blocks for players on Fabric who prefer the older bounce mechanics.
What it does
The mod reverts the slime block changes introduced in the 1.21.2 development cycle, so bouncing and falling work the way they did before. It is a client and server mod, and both sides need it installed for the behavior to work properly. Files are published for Fabric only, for six game versions, 1.21.5 – 1.21.10, with 1.0.1 for 1.21.10 as the latest file. The code is open source under the MIT License.
Key features
Original slime bounce
Slime blocks return to the bounce behavior they had before the later changes.
Sneak fall damage
Sneaking while standing on a slime block causes fall damage, as a counterweight to the bounce.
Jump cancels bounce
Holding the jump key while landing on a slime block cancels the bounce.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
How it compares
Revert Toggle Sneak is a client-side only Fabric mod for 1.21.9 – 26.3 under the MIT License, and it is open source. Revert MC-101556 is a server-side only Fabric mod for 1.21.5 under the Apache License 2.0, and it is open source as well.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Slime Unfix | Fabric | 1.21.5 – 1.21.10 | Client and server | 2025-08-02 |
| Revert Toggle Sneak | Fabric | 1.21.9 – 26.3 | Client-side only | 2026-03-29 |
| Revert MC-101556 | Fabric | 1.21.5 | Server-side only | 2025-04-24 |
Questions
Does Slime Unfix need to be installed on the server?
Which game versions does Slime Unfix support?
In the catalog
Slime Unfix is one of 29,952 Game mechanics mods on ModsFinder, and one of 19,630 Game mechanics mods for Fabric. 15,569 mods support Minecraft 1.21.10.
Similar mods
What the author says
Reverts the changes made to slime blocks in Minecraft 1.21.2 snapshots and pre-releases The mod is both client-sided and server-sided, and must be installed on both client and server to work properly Changes: - Sneaking on slime block deals fall damage - Holding jump on slime block cancels the bounce
Official listing
- Modrinth page
- modrinth.com/mod/slime-unfix
- Owner
- HyperKNF
- Published
- 2025-07-14
- Updated on Modrinth
- 2025-08-02
- Facts verified
- 2026-10-15