One Heart Mode
One Heart Mode turns survival into a one-life challenge by holding every player at a single heart, two HP, for good.
What it does
Players keep only one heart, which is 2 HP, and the cap does not reset over time. Any hit that would take a player below that point ends the run. The mod suits survival worlds, adventure maps and multiplayer servers where players want a hardcore run without cheats or gimmicks, and it can be combined with Natural Regeneration for a harsher version of the same idea.
Players are tested against mobs, lava and falls while holding a single heart. The mod's rules are short to understand, which makes its difficulty clear at a glance. It is lightweight and free, and the install is straightforward for a server. Required dependencies are listed as extra mods that must be present; the mod runs on NeoForge, with files for 1.21.1 – 1.21.11, and only the server needs it, so players join without installing anything.
Key features
Permanent single heart
Each player is limited to one heart, and the limit is never restored during the run.
Immediate failure
A mistake that takes the last heart ends the run, so every fall, fight and lava pool matters.
Multiplayer support
The challenge applies on survival servers and in multiplayer worlds, with each player held to the same cap.
Simple rules
The mod changes one core rule and adds no new items, blocks or menus to learn.
Compatibility
Latest build for each game version and loader.
1.21.x11 of 11 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Hardcore challenge runs
Players who want a survival run with no margin for error can play a full world under the one-heart rule.
Group challenges
Friends on a server can compare how long each player survives under the same cap.
Who it’s for: The mod suits players who enjoy hardcore survival and server owners who want a shared challenge without adding cheats or extra content.
How it compares
Player Lives is a NeoForge mod for 1.21.8 – 1.21.10 that runs on client and server, under the MIT License and not open source. Half Your Hearts is server-side only, under the MIT License and not open source, with files for 1.21.4 – 1.21.5. Withered Hearts is open source under the MIT License and works on Fabric and NeoForge across 1.21 – 26.2, but it is client-side only, so it differs in where it runs.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| One Heart Mode | NeoForge | 1.21.1 – 1.21.11 | Server-side only | 2026-02-26 |
| Player Lives | NeoForge | 1.21.8 – 1.21.10 | Client and server | 2025-12-06 |
| Half Your Hearts | NeoForge | 1.21.4 – 1.21.5 | Server-side only | 2025-05-03 |
| Withered Hearts | Fabric and NeoForge | 1.21 – 26.2 | Client-side only | 2026-06-19 |
Questions
Does One Heart Mode need another mod?
Does every player need the mod installed?
Which game versions does One Heart Mode support?
In the catalog
One Heart Mode is one of 19,031 Adventure mods on ModsFinder, and one of 8,588 Adventure mods for NeoForge. 19,862 mods support Minecraft 1.21.11.
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What the author says
Do you think you’re a true Minecraft survivor? One Heart Mode turns every game into a fight for life! Players permanently have only 1 heart (2 HP).
Official listing
- Modrinth page
- modrinth.com/mod/one-heart-mode
- Owner
- ahmadmosaad2013
- Published
- 2026-02-26
- Updated on Modrinth
- 2026-02-26
- Facts verified
- 2026-10-15