Java Edition 1.18 Experimental Snapshot 1

1.18 Experimental Snapshot 1 is the first experimental snapshot for Java Edition 1.18, released on July 13, 2021, which introduces new terrain generation and enables features from the preview data pack.

World generation

 * Caves


 * 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.
 * Dripstone Caves and Lush Caves now generate naturally underground.
 * 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.
 * Improved old caves to blend in with the new generations of caves better.
 * New carver called crack carver, which appears as a fissure on the ground, like ravines but narrower and can go very deep.
 * 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 an 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.


 * Mountains


 * Come in 5 sub-biomes:
 * Mountain Meadow
 * The lowest layer of a mountain that look like a flowery and colder plains, with an aqua grass color.
 * Contains double tall grass.
 * Unlike the Bedrock Edition, does not contain sweet berry bushes
 * Contains a mix of any kind of one-block-tall flower.
 * Some areas contain many dandelions, azure bluets and cornflowers.
 * Some areas contain cornflowers and blue orchids.
 * Some areas contain blue orchids and daisies.
 * Some areas just poppies.
 * Other areas are filled with various flowers, even alliums and blue orchids.
 * Rabbits and donkeys spawn in this biome.
 * Common passive mobs and horses will not spawn.
 * Mountain Grove
 * Reminds a snowy taiga with snow blocks instead of grass blocks.
 * The second lowest layer of a mountain.
 * Covered in snow, snow blocks, powder snow and is filled with spruce trees.
 * Only rabbits spawn in this biome.
 * Snowy Slopes
 * The second highest layer of a mountain.
 * Covered in snow, snow blocks, powder snow and ice.
 * Goats spawn only in the snowy slopes biome.
 * Lofty Peaks
 * The highest layer of a mountain which will only generate if the mountain is high enough.
 * Generates if the surrounding biomes are too warm for snow capped peaks.
 * Covered in snow, snow blocks and ice.
 * Snow Capped Peaks
 * The highest layer of a mountain which will only generate if the mountain is high enough.
 * Generates if the surrounding biomes are too cold for lofty peaks.
 * Covered in snow, snow blocks, ice, powder snow, and packed ice.


 * Ore veins
 * Long and rare ore formations.
 * Copper ore veins mixed with granite and raw copper block generate above Y=0.
 * Iron ore veins mixed with tuff and raw iron block generate below Y=0.

Mobs

 * Axolotls
 * Now only spawn in lush caves.
 * Goat
 * Now only spawn in the new mountain biomes.
 * General
 * Hostile mobs will only spawn in complete darkness.

Items

 * Bundle and Sculk Sensor
 * Have been re-added to the Creative Mode inventory.

World generation

 * Lush Caves and Dripstone Caves
 * Now generate naturally underground and inside hills or mountains.
 * Azalea trees now generate above lush caves.
 * Deep Warm Ocean
 * Now generates naturally.


 * Ore distribution
 * New ore distribution has been implemented, see the chart.
 * Changed the maximum height of small iron ore blobs from 64 to 72.
 * Reduced copper spawning a bit, to compensate for large ore veins.
 * Slightly reduced the amount of normal-sized iron blobs, to compensate for large ore veins and the increased range of smaller blobs.


 * General
 * Natural variation in terrain shape and elevation, independently from biomes.
 * For example, forests and deserts sometimes could form up on a hill without needing a special biome just for that.

General

 * 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
 * Removed the Large Biomes and Amplified world types.

Issues

 * This version is not supported on the bug tracker and therefore issues affecting it will be closed as "Invalid" on the bug tracker.

Trivia

 * A  for a version called   was mistakenly uploaded instead of this snapshot at first.
 * Combat Test 6 was actually based upon Java Edition 1.16.2 Pre-release 3.
 * This is the first time that the light level requirement for common hostile mob spawning gets changed for more than 11 years, since the "light level 7 and below" rule was implemented on February 4, 2010, while the game was still in its Indev phase.
 * This is the first development version using the term "Experimental Snapshot", which starts the update development before the initial snapshots will begin, sometime in September.

Video
Video made by slicedlime: