Overview
No release has changed what a Minecraft world looks like more than Caves & Cliffs: Part II, and the reason is architectural rather than cosmetic. Mojang decoupled terrain shape from biome placement, so the game now decides where a mountain goes and separately decides what grows on it — which is why 1.18 mountains rise past 250 blocks and actually look like mountains rather than lumpy hills with snow on top. The world was extended down to Y=-64 and up to Y=320, adding 64 blocks of new underground space that caves carve continuously through. Those caves are generated by noise rather than by tunnelling algorithms, which is why cheese caves, spaghetti caves and aquifers all exist now and why a cave can run for a kilometre. Ore distribution was rebalanced around the new height: diamonds concentrate near the bottom, iron is everywhere. And one small change reshaped building permanently — hostile mobs now require light level 0 rather than 7, so a dimly lit base is safe, and the torch spam that how to mine safely used to demand stopped being necessary. Old worlds blend at the border rather than snapping, but the seam is visible.
Terrain worth exploring for its own sake: mountains over 250 blocks tall, continuous cave systems through negative Y, lush caves and dripstone caves generating in the wild at last, six mountain biomes, redistributed ores, and an end to torch-spamming thanks to the light level 0 spawn rule.
Part II was the largest change to world generation in the game's history. Terrain and biome placement were decoupled, so mountains rise over 250 blocks and cave systems carve continuously through the new negative Y space. Every ore was redistributed, making diamond deepest and iron ubiquitous. The light-level change quietly ended mob spawning inside partially lit bases, which reshaped how everyone builds.
How to get it
Java Edition 1.18 was released on 30 November 2021 and raised the world height to a full 384 blocks, from Y=-64 to Y=320. Back up any older world before opening it here, because the upgrade rewrites how new chunks generate against your existing terrain.
Tips
- Diamond Ore is densest around Y=-59 after the redistribution, a very different answer from the pre-1.18 Y=11.
- Hostile mobs need light level 0 to spawn, so a single torch per room is now enough rather than a grid of them.
- Old chunks and new chunks meet at a visible seam; start a fresh world if you want unbroken 1.18 terrain.
- Read best Y level for every ore before mining — every pre-1.18 mining guide is wrong now.
Version notes
Released 30 November 2021. Rewrote terrain generation, extended world height to Y=-64 through Y=320, added noise caves and aquifers, six mountain biomes, natural lush and dripstone caves, and the light level 0 spawn rule.
What it added
- World height extended to Y=-64 through Y=320
- Completely rewritten terrain generation with towering mountains and deep valleys
- Noise caves, cheese caves, spaghetti caves and aquifers
- Lush caves and dripstone caves finally generating naturally
- New mountain biomes: meadow, grove, snowy slopes, jagged peaks, frozen peaks, stony peaks
- Ore distribution rebalanced around the new world height
- Hostile mobs now require light level 0 rather than 7 to spawn
Properties
Minecraft 1.18 was released on November 30, 2021 as a major release. It added 0 mobs, 0 blocks and items the site documents, and 0 generated structures.
- New blocks and items
- 0
- New structures
- 0
Where it sits in the release line
1.18 sits 9 of 28 in the release list this site covers, with 1.19 after it and 1.17 before.
Worlds always upgrade forwards and never downgrade: a world opened in a newer version cannot be opened in an older one again, so back it up before the first launch on a new release.
| Version | Name | Released | Type | |
|---|---|---|---|---|
 | Minecraft 1.19 | The Wild Update | June 7, 2022 | Major release |
| Minecraft 1.18 ← | Caves & Cliffs: Part II | November 30, 2021 | Major release | |
 | Minecraft 1.17 | Caves & Cliffs: Part I | June 8, 2021 | Major release |
Guides and tools that cover this
Frequently asked questions
What is the world height in 1.18?
From Y=-64 to Y=320, a total of 384 blocks. That is 64 blocks deeper and 64 blocks taller than before the update, and the new depth is mostly Deepslate.
Did 1.18 change where diamonds are?
Yes, substantially. Diamond density rises as you go deeper and peaks near Y=-59, so old guides recommending Y=11 are out of date.
What happens to an existing world in 1.18?
Existing chunks are kept and new chunks generate with the new rules, blending at the border. The seam is usually visible, so a new world is better if terrain matters to you.
What did Minecraft 1.18 add?
World height extended to Y=-64 through Y=320 Completely rewritten terrain generation with towering mountains and deep valleys Noise caves, cheese caves, spaghetti caves and aquifers
When was Minecraft 1.18 released?
Java Edition 1.18 was released on November 30, 2021. Bedrock dates for the same content often differ by days or weeks.