Toroidal World

Walk around the world. The world has a finite size and no edge: cross the border on one side and you walk in from the opposite side — no barrier, no teleport, no visible seam. Go around the world on foot, or run an SMP where nobody can outrun anybody forever.

What it does

• Adds a World Shape option to the world-creation screen — pick a shape and set the world size in chunks.
• Terrain is genuinely periodic — the noise itself wraps, so mountains, biomes and structures continue across the seam instead of hitting a mirrored wall or a cut-off cliff.
• The game keeps working across the seam, not just the blocks: mob AI and pathfinding, projectiles and explosions, sounds and particles, compasses and lodestones, villages and raids, distance-based advancements — they all treat the world as round.
• The Nether and the End follow the shape — the Nether scaled relative to the overworld, the End with its own size.

World shapes

• Toroidal — both horizontal axes loop: walk far enough in any direction and you come back to where you started.
• Cylinder — one horizontal axis loops, the other goes on forever like vanilla; you pick which axis loops, and the Nether and the End loop along the same one.

Dedicated servers

One line in server.properties creates a shaped world: level-type=toroidal_world:medium for a toroidal one, level-type=toroidal_world:cylinder_medium for a cylinder, each in five sizes — tiny, small, medium, large, huge. Custom sizes and the full walkthrough are in the dedicated server guide.

Compatibility

Runs on NeoForge and Fabric.

Supported

• Sodium and Iris Shaders.
• Lithium — two of its optimizations are switched off automatically.
• C2ME.
• JourneyMap, Xaero's Minimap and Xaero's World Map.
• Create (1.21.1 only).

Partially supported

• LOD mods (Distant Horizons, Voxy) — distant terrain is not wrapped across the seam yet.

Before you download

• The world shape is chosen at world creation — an existing vanilla world cannot be converted into a toroidal or cylinder one (or back).
• The mod is pre-1.0: world compatibility between mod versions is not guaranteed until 1.0.

Bug reports

Found something broken — especially anything that behaves differently near the seam? Report it on the issue tracker.