Open one door of a double door and the other opens with it. Trapdoors in a row along a wall or a floor open together, and so do fence gates stacked above each other. Redstone couples them too, as long as the signal is strong enough (8 or more), so a weak signal still moves a single block when you want it to.
This is a continuation of Couplings by Chloe Dawn (Apache-2.0, over seven million downloads, last released for 1.20.1), ported to Minecraft 26.3 with full credit; the original author is not involved. The port moved the hooks to the start and end of the vanilla methods so it survives small vanilla changes, dropped the client sync (the mod is now purely server-side), and uses a plain config file.
Compatibility: Minecraft 26.3 with Fabric Loader 0.20.1 and Fabric API. Java 25. Server-side: runs on dedicated servers and on the integrated server in singleplayer; other players install nothing. Licence: Apache-2.0, continued from Couplings by Chloe Dawn with the original licence and notice included in the jar.
Found a bug or want a feature? Comment here and I will answer. Custom plugin work for servers is available on request.
Need something custom? I build small server plugins to order from $35 (fixes) and $90 (a new one-feature plugin): https://ko-fi.com/molonlav3/commissions . If this mod saved you time, a coffee helps keep the updates coming: https://ko-fi.com/molonlav3
Updating Minecraft? Run the free Update-Ready Check first to see which of your mods will break: https://molonlav3.itch.io/hytale-update-check
One command tells you which of your plugins will break on the next Paper version, before you update.
One command tells you which of your plugins will break on the next Paper version, before you update.
