LyCH_OS's Tileman

Tileman is a Fabric mod for Minecraft Java Edition, inspired by the tile-based gridlock challenge in Old School RuneScape and the Tileman plugin for the OSRS RuneLite client. The world is split into 3x3 starting tiles, and players spend earned tiles to expand. Walking onto a tile that has not been acquired bounces the player back. Spawns are fixed at the center starter grid and respawns always return there, so the challenge stays consistent.

The mod supplies a tileman command for extra customization, and it can be run on a new world in Adventure mode, with most processes paused, before the player confirms the lock settings and begins. Switching to Spectator mode pauses tile movement tracking, which lets players explore without affecting the game. The default key B shows the coordinates of tiles that are not yet owned.

Tileman needs Fabric API, so the latest Fabric API build for the game version should be installed next to it. The server and every player need the mod installed. The code is released under the GLWTPL, which is not open source, and the source code is publicly available. Files are published for 1.21.8 and 26.1.2, with 0.0.4.1-mc26.1.2 as the latest file for 26.1.2.