Lattice
by bideco
Several people can use one Windows computer together, each playing Minecraft in a separate session with separate keyboard and mouse input, because Lattice allows that setup.
What it does
Lattice provides local couch co-op for Minecraft Java Edition. Each extra player runs a separate Minecraft instance on the same machine and is routed to their own keyboard and mouse, while the main player keeps normal control of Windows, launchers and the desktop. The mod is client-side only, so only the player's own game needs it.
Player 0 manages the routed players from a master settings screen covering audio, video, resource packs, profiles, selected mods and config values. Settings can be locked and forced on routed-player instances where supported, and per-instance options are saved and restored with profiles. Slot-aware HUD cursors show each player's connection and routing state in-game. Lattice depends on Lattice Weaver, a companion program for Windows that walks users through device configuration and assigns each player's slot. The mod is built for Fabric and launchers that use MultiMC or Prism-style instance folders, with builds covering 1.20 – 26.1.2.
Key features
Separate controls per player
Players two and up have their keyboard and mouse routed to their assigned instance, while player one stays on native input.
Slot-aware HUD cursors
Each cursor on screen is tied to a player slot and shows that player's connection and routing state.
Lockable settings
Player 0 can lock settings so routed-player instances cannot change them where the game supports forcing.
Profile-aware setup
Per-instance options and controls are saved and restored together with a profile, so a seat keeps its setup between sessions.
Gallery
Compatibility
Latest build for each game version and loader.
26.x3 of 3 versions with builds
1.21.x12 of 12 versions with builds
1.20.x7 of 7 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Family or friends at one PC
Several people on one Windows machine can each play their own world from their own seat during a shared session.
Who it’s for: Players who want local multiplayer on a single computer, and anyone who already manages Minecraft through a multi-instance launcher and wants separate input per instance.
How it compares
OnlyKeys is client-side only and released under the CC0 1.0 Universal license, covering 1.20 – 1.21.6, so it is open source and ends at an older range. Fast Click is client-side only under the MIT License, open source, and covers 1.21.11 – 26.2, a newer range than Lattice's. Lattice is not open source and uses All rights reserved.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Lattice | Fabric | 1.20 – 26.1.2 | Client-side only | 2026-06-16 |
| OnlyKeys | Fabric | 1.20 – 1.21.6 | Client-side only | 2025-08-22 |
| Fast Click | Fabric | 1.21.11 – 26.2 | Client-side only | 2026-07-24 |
Questions
Does Lattice need Lattice Weaver?
Which loader does Lattice use?
Does Lattice work on a server?
In the catalog
Lattice is one of 36,990 Utility mods on ModsFinder, and one of 25,772 Utility mods for Fabric. 15,189 mods support Minecraft 26.1.2.
Similar mods
What the author says
Local couch co-op for Minecraft Java. Run multiple Minecraft instances on one Windows PC and give each local player their own keyboard, mouse, cursor, HUD, and settings profile. Lattice is the Minecraft adapter for Lattice Weaver, the Windows companion app that handles guided device setup and player-slot routing.
Official listing
- Modrinth page
- modrinth.com/mod/latticework
- Owner
- bideco
- Published
- 2026-04-13
- Updated on Modrinth
- 2026-06-16
- Facts verified
- 2026-10-15