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Minecraft 1.18 Experimental Snapshot 1
1.18 Experimental Snapshot 1 banner.jpg
1.18 Experimental Snapshot 1 reddit.png
Java Edition 1.18 Experimental Snapshot 1 menu.png

Java Edition


Experimental snapshot

Release date

July 13, 2021

Experimental snapshot for



Client (.json[a])

Obfuscation maps


Protocol version

 dec: 1073741865
 hex: 40000029

Data version


1.18 Experimental Snapshot 1 (known as 1_18_experimental-snapshot-1 in the launcher) is the first experimental snapshot for Java Edition 1.18, released on July 13, 2021,[1] which introduces new terrain generation and enables features from the preview data pack.


World generation[]

  • Completely overhauled.
  • Now stretch down to Y=-59.
  • The cavern now generates in 2 layers of different stone bases depending on the depth.
    • Cavern layer above Y=0 is made up of regular stone.
    • Stone transitions to deepslate from Y=0 to Y=-7.
    • Deepslate now completely replaces stone from Y=-8 to bedrock.
      • Certain types of ores and structures still generate in the deepslate layer, as well as tuff.
      • Dirt, diorite, granite and andesite do not generate in this layer.
  • Contain aquifers, bodies of water with different heights, independent of sea level (Y=63).
    • Aquifers below Y=0 sometimes generate with lava instead of water.[2]
  • Improved old caves, adding more variation.[3]
  • New noise caves, coming in 3 forms, cheese, spaghetti and noodle.
    • The original caves still exist with their generation slightly tweaked to better blend in with noise caves.
    • Cheese caves have large stone towers stretching from the bottom of the cave to the top.
      • Very large, often large enough to fly with elytra.
      • Abundant with springs, aquifers and ores.
    • Spaghetti caves are long, thin caves that have small aquifers and are more similar to original caves.
    • Noodle caves are thinner, squigglier and more claustrophobic variants of spaghetti caves.
Ore veins


Debug screen
  • Added two new lines: Multinoise and Terrain.
    • Only appear if the dimension where the player is uses the multi-noise biome source type.
    • Multinoise lists the parameters used at the player's position in order to place a biome. C is continentalness, E is erosion, T is temperature, H is humidity and W is weirdness.
    • Terrain lists values related to terrain generation.[more information needed]



Sculk Sensor
  • Have been re-added to the Creative Mode inventory.
Snow Block
  • Plants can now be placed on snow blocks.


  • Have been re-added to the Creative Mode inventory.
  • Can once again be crafted.


  • Hostile mobs only spawn in areas where the light level is 0.
    • This change only affects block-light and not sky-light.[4]

World generation[]

  • Now uses the multi-noise biome source type.
Lush Caves and Dripstone Caves
  • Now generate naturally underground and inside hills or mountains.
Deep Warm Ocean
  • Now generates naturally.
  • Does not generate correctly. This is fixed in 1.18 experimental snapshot 2.[5]

The new ore generation for 1.18 Experimental Snapshot 1.

Ore distribution
  • Changed ore generation of all ores making them have a spread value like lapis lazuli ore. Some still retain a linear generation alongside a spread generation.
  • Coal ore, emerald ore, and copper ore no longer generate below Y=0.
    • Copper ore generates between Y=0 and Y=96 and like all other ores, uses spread. It peaks at Y=48.
    • Emerald ore generates above Y=32 as a spread, peaking at Y=256 and decreasing in quantity as the altitude decreases.
    • Coal ore attempts to generate twice: once, evenly between an altitude of Y=136 and Y=256; and as a spread, peaking at an altitude of Y=96 and generating between an altitude of Y=0 and Y=192.
  • Other ores also generate differently.
    • Iron ore attempts to generate three times: once as a spread peaking at an altitude of Y=256, generating above Y=128; another as a spread peaking at Y=16 and generating with a minimum height of Y=-24 and a maximum height of Y=57, and a smaller one spreading evenly between the altitudes of Y=-64 and Y=-32.
    • Gold ore generates between the altitudes of Y=-64 and Y=32, peaking at Y=-16. The extra gold that generates in the badlands biome was left untouched.
    • Lapis lazuli ore attempts to generate twice: once, as a spread between the altitudes of Y=32 and Y=-32, peaking at an altitude of 0; and evenly between the altitudes of Y=64 and Y=-64, generating buried like ancient debris.
    • Redstone ore attempts to generate twice: once, evenly between an altitude of Y=15 and Y=-64; and as a spread, peaking at an altitude of -64 and generating below an altitude of Y=-32.
    • Diamond ore now generate as a spread, generating below Y=16 and peaking at altitudes near Y=-64.
  • Terrain generation is now independent from biomes, with biomes adapting to whatever terrain they happen to generate throughout.[6]
    • This allows for natural variation in the terrain of any individual biome, both in terms of shape and elevation.
      • For example, forests and deserts could form up on a hill without needing a special biome just for that purpose.
    • This additionally allows for smoother transitions between biomes.
  • Terrain is now smoother and more extreme.


Height limit
  • Has been increased to 384 blocks, expanding 64 blocks up and 64 blocks down, with 320 being the limit upward and -64 being the limit downward.
World types



  • MC-126009 could be considered fixed by this version.


This version is not supported on the bug tracker, and therefore issues affecting it will be resolved as "Invalid".[7]


  • This is the first time that the light level requirement for common hostile mob spawning has been changed for more than 10 years. The "light level 7 and below" rule was originally implemented on February 4, 2010, while the game was still in its Indev phase, and remained constant since with the exception of Java Edition Alpha v1.2.0 through Java Edition Alpha v1.2.0_02, where the restrictions were height based.
  • This is not the first "experimental snapshot", as it was preceded by Java Edition Combat Tests, but this is the first one to be available on Minecraft.net and the first to lead to a proper snapshot.
  • This is the first time the terrain has been changed since Java Edition 1.13 in 2018, and is the first time the terrain has been completely overhauled since Java Edition 1.7.2 in 2013.
  • Unlike later experimental snapshots, the title of this version is in title case.


Video made by slicedlime:



  1. Unzip this file in the .minecraft/versions folder.