
Handoff Relay
A timed Minecraft handoff challenge mod supporting serialised world-transfer and hosted gameplay workflows.
Screenshots

About this Mod
Handoff Relay
Handoff Relay is a Minecraft Fabric mod designed for timed, serialised gameplay handoff challenges.
The mod allows a Minecraft world to be passed between players while preserving player progression, timer state, inventory state, and world continuity between sessions.
Handoff Relay supports both:
- singleplayer/world-transfer workflows
- dedicated Fabric server hosted workflows
Core systems include:
- timed gameplay sessions
- reconnect timer continuation
- timer expiry enforcement
- expired player reconnect blocking
- player inventory persistence
- armour/offhand persistence
- ender chest persistence
- XP/health/hunger persistence
- potion/status effect persistence
- location and respawn persistence
- single active-player enforcement
- spectator account allowance
- configurable participant count tracking
- player order tracking (Player 1 of X, Player 2 of X, etc.)
- anti-creative / anti-flight enforcement
- dangerous command abuse blocking
- LAN cheat escalation mitigation
- persistent handoff save tracking
- backup save recovery
- integrity lock protection
The project is intended for:
- serialised gameplay recordings
- challenge runs
- collaborative survival handoff projects
- structured world-transfer events
- hosted sequential multiplayer experiences
Current project state:
Stable public release (v1.0.0).
Notes:
Handoff Relay is designed to preserve fair serialised gameplay progression between participants. Administrative filesystem tampering or deliberate world file modification is outside standard gameplay expectations and may affect continuity.
Issue Tracker
Found a bug or have a feature request?
Please report issues through the GitHub issue tracker:
https://github.com/Kingra007/handoff-relay/issues
When reporting a bug, please include:
- Handoff Relay version
- Minecraft version
- Fabric Loader version
- Singleplayer or dedicated server
- Steps to reproduce
- Expected behaviour
- Actual behaviour
- Latest log file (if available)
Available Versions
How to Install Handoff Relay on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set fabric Loader
In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.11).
Install Mod
Open the mod browser in the dashboard and search for "Handoff Relay". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.21.11
Server-side
✓ RequiredRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
Handoff Relay server crashes on startup – what to do?
Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.11). You can switch loaders with one click in the panel.
Is Handoff Relay compatible with fabric?
Handoff Relay officially supports fabric for Minecraft 1.21.11. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with Handoff Relay – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Handoff Relay consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.
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Rent Modded Server
Install Handoff Relay with just one click on your server.