Slime Chunk Finder & Visualizer

How Slime Chunks Work

In the Overworld, most slime spawning outside of swamps happens in designated slime chunks below Y=40. Slime chunks are determined purely from the world seed using a repeatable pseudo-random formula. This means once you know the seed, the slime chunk pattern never changes.

Usage Tips

• Enter a numeric or string seed (string seeds are hashed locally).
• The simulation distance highlight helps approximate which chunks are processed simultaneously during farm operation.
• Click a slime chunk to see a copyable coordinate panel showing chunk (X,Z) and its 16x16 block range.
• Preview internal platform points (12x12) avoiding walls for better spawn rates.
• Export JSON to save or share your planning session.

Accuracy

The calculation here mirrors the official Java logic: a chunk is a slime chunk if Random(mixedSeed).nextInt(10) == 0with the same seed mixing constants used by the game. No approximations, no API calls.

For very large coordinate exploration the internal math remains consistent; a future upgrade will add a BigInt path for absolute parity with Java long overflow in extreme ranges (rarely relevant to normal survival bases).

Current Advanced Features

• Exact BigInt mode for maximum parity at huge coordinates.
• Largest adjacent slime cluster highlighting.
• Optional swamp chunk overlay input.
• Copyable coordinate + interior platform point helper.
• Shareable URL state (seed, center, radius, sim distance, visual settings).

Frequently Asked Questions

Do slimes spawn in swamps differently?

Yes—at night in specific light conditions and moon phases above certain Y levels. This tool focuses on underground slime chunks. A future update will layer swamp spawn windows.

What is simulation distance?

Simulation distance determines which chunks are actively processed (entity AI, spawning). Keeping your AFK point so farm chunks are inside while surrounding caves are outside reduces unwanted spawns.

How many slime chunks should I use?

One is enough for early game. For higher output, pick 2–4 adjacent slime chunks and stack platforms every 3 blocks vertically from bedrock (or deepslate floor) up to below Y=40.