Deadly Jump
Deadly Jump is a NeoForge cursed mod for 1.21.4 in which pressing the jump key ends the game at once.
What it does
Jumping is the only action that triggers the penalty: any jump leaves the player dead and sends them to the game-over screen. The rule applies across the whole world, so a single accidental press during exploration or combat ends the run. Players who join a server with the mod need it installed on their side too.
The mod is aimed at players who want a deliberately punishing challenge. Walking ledges, climbing hills, dodging monsters and crossing caves all have to be done without leaving the ground, and a single block can become an impassable wall. Ladders, slabs and scaffolding become the main way to move, and the mod is built around removing the habit of jumping that most players have built up.
Deadly Jump is published for NeoForge only, with one file for 1.21.4, released as beta version 1.0.0 on 2026-06-07. The client and server both need the mod, and the code is not open source: it is released under All rights reserved.
Key features
Instant death on jump
Any jump kills the player immediately, with no warning and no grace period.
Whole-world rule
The penalty applies everywhere in the world, so the challenge changes terrain, boss fights and travel alike.
Movement without jumping
Ladders, slabs and scaffolding replace jumps for climbing and crossing gaps, which shapes how builds and routes are planned.
Crafting support
Items that help avoid jumps, such as ladders and scaffolding, are needed to leave caves and progress through the game.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Players who enjoy cursed and adventure challenges on NeoForge 1.21.4, including those who want to finish a whole run without a single jump. Server owners who want a shared challenge can run it on their server alongside the client installs.
How it compares
Don't Jump! is a server-side only mod for Fabric, Forge and NeoForge, released under the Apache License 2.0, with files for 1.20.1 – 1.21.8. Players can join a server running it without installing anything. Burnt Sun is a NeoForge mod for 1.21.4 – 1.21.9 where the server is required and the client is optional, under All rights reserved and not open source.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Deadly Jump | NeoForge | 1.21.4 | Client and server | 2026-06-07 |
| Don't Jump! | Fabric, Forge and NeoForge | 1.20.1 – 1.21.8 | Server-side only | 2025-11-03 |
| Burnt Sun | NeoForge | 1.21.4 – 1.21.9 | Server required, client optional | 2025-10-06 |
Questions
Does Deadly Jump need to be installed on the server?
Which loader does Deadly Jump support?
Can the challenge be finished without jumping?
In the catalog
Deadly Jump is one of 7,555 Cursed mods on ModsFinder, and one of 2,801 Cursed mods for NeoForge. 17,979 mods support Minecraft 1.21.4.
Similar mods
What the author says
Think you are a survival expert? Have you beaten the game with no armor or just half a heart? Forget all of that. This mod introduces only one simple, yet completely ruthless rule that will turn your entire world upside down: IF YOU PRESS THE SPACEBAR, YOU DIE INSTANTLY! Jumping is a natural reflex for every gamer…
Official listing
- Modrinth page
- modrinth.com/mod/deadly-jump
- Owner
- CloudinsOff Corp.
- Published
- 2026-06-07
- Updated on Modrinth
- 2026-06-07
- Facts verified
- 2026-10-15