Lunar Base

ACME Self-Building Lunar Base
Biomes	The Moon
Generates in; existing chunks	No
	Dropper; Iron Bars; Iron Trapdoor; Light Weighted Pressure Plate; Smooth Quartz Slab; Lightning Rod; End Rod; Chain; Polished Basalt; Lava; Copper Spleaves; Polished Blackstone Button; Soul Lantern; Block of Raw Copper; Waxed Cut Copper Stairs; Waxed Block of Copper; Waxed Cut Copper; Waxed Exposed Copper; Waxed Exposed Cut Copper; Waxed Weathered Copper; Waxed Weathered Cut Copper; Waxed Oxidized Copper; Waxed Oxidized Cut Copper; Chest; Green Shulker Box; Barrier;

This article documents an April Fools' Day joke.

This feature was exclusively part of a joke version and is not currently planned for addition to regular Minecraft.

ACME Self-Building Lunar Bases were joke features that could be found on the Moon in the April Fools' snapshot 23w13a_or_b.

Generation

Lunar bases generate in the moon biome with a ¹⁄₁₀₂₄ chance to generate in a given chunk.

Structure

Lunar bases look similar to moon rovers at first, with a dropper renamed to "ACME Self-Building Lunar Base" at the center. Pressing the golden pressure plate located on the rover starts the construction of an enormous lunar base. Adding objects to the dropper does not seem to change construction, although having blocks above it prevents it from starting to expand.

Loot

Loot in the lunar base is located in two types of containers: chests, named "Moon Mission Resupply Crate", and green shulker boxes, named "Lunar Laboratory Equipment". The former generates basic resources to survive on the Moon, like dirt, saplings and vegetables to farm, while the latter can generate items unobtainable in normal Survival gameplay, such as spawn eggs and budding amethyst, as well as a large variety of other items.

Moon Mission Resupply Crate

In Java Edition, each moon resupply chest contains items drawn from 3 pools, with the following distribution:

Item	Stack Size ^[A]			Weight ^[B]			Chance ^[C]	Avg. per chest ^[D]	Avg. # chests to search ^[E]
Item	1–3×	1–2×	0–1×	1–3×	1–2×	0–1×	Chance ^[C]	Avg. per chest ^[D]	Avg. # chests to search ^[E]
Sand	5–64	—	—	²⁰⁄₉₄	—	—	36.8%	14.681	2.7
Dirt	5–10	—	—	²⁰⁄₉₄	—	—	36.8%	3.191	2.7
Iron ingot	—	1–4	—	—	³⁰⁄₁₂₀	—	34.4%	0.938	2.9
Gold ingot	—	1–4	—	—	³⁰⁄₁₂₀	—	34.4%	0.938	2.9
Grass Block	1–3	—	—	¹⁵⁄₉₄	—	—	28.7%	0.638	3.5
Gravel	5–64	—	—	¹⁰⁄₉₄	—	—	19.8%	7.340	5.0
End Stone	1–3	—	—	¹⁰⁄₉₄	—	—	19.8%	0.426	5.0
Snow block	1–3	—	—	¹⁰⁄₉₄	—	—	19.8%	0.426	5.0
Bone meal	—	—	1–8	—	—	¹⁰⁄₃₅	14.3%	0.643	7.0
String	—	—	1–8	—	—	¹⁰⁄₃₅	14.3%	0.643	7.0
Oak log	—	1–4	—	—	¹⁰⁄₁₂₀	—	12.2%	0.312	8.2
Bucket	1	—	—	⁵⁄₉₄	—	—	10.3%	0.106	9.7
Gunpowder	—	—	1–8	—	—	⁵⁄₃₅	7.1%	0.321	14.0
Acacia sapling	—	1–4	—	—	⁵⁄₁₂₀	—	6.2%	0.156	16.2
Birch sapling	—	1–4	—	—	⁵⁄₁₂₀	—	6.2%	0.156	16.2
Carrot	—	1–4	—	—	⁵⁄₁₂₀	—	6.2%	0.156	16.2
Jungle sapling	—	1–4	—	—	⁵⁄₁₂₀	—	6.2%	0.156	16.2
Oak sapling	—	1–4	—	—	⁵⁄₁₂₀	—	6.2%	0.156	16.2
Spruce sapling	—	1–4	—	—	⁵⁄₁₂₀	—	6.2%	0.156	16.2
Wheat seeds	—	1–4	—	—	⁵⁄₁₂₀	—	6.2%	0.156	16.2
Beetroot seeds	—	1	—	—	⁵⁄₁₂₀	—	6.2%	0.062	16.2
Pumpkin seeds	—	1	—	—	⁵⁄₁₂₀	—	6.2%	0.062	16.2
Lava Bucket	1	—	—	²⁄₉₄	—	—	4.2%	0.043	23.8
Water bucket	1	—	—	²⁄₉₄	—	—	4.2%	0.043	23.8

↑ The size of stacks (or for unstackable items, number) of this item on any given roll.
↑ The weight of this item relative to other items in the pool.
↑ The odds of finding any of this item in a single chest.
↑ The number of items expected per chest, averaged over a large number of chests.
↑ The average number of chests the player should expect to search to find any of this item.

Lunar Laboratory Equipment

In Java Edition, each moon lab shulker box contains items drawn from 3 pools, with the following distribution:

Item	Stack Size ^[A]			Weight ^[B]			Chance ^[C]	Avg. per chest ^[D]	Avg. # chests to search ^[E]
Item	1–3×	1–3×	1–3×	1–3×	1–3×	1–3×	Chance ^[C]	Avg. per chest ^[D]	Avg. # chests to search ^[E]
Iron ingot	—	1–4	5–16	—	³⁰⁄₂₃₂	¹⁰⁄₁₄₃	33.9%	2.115	3.0
Gold ingot	—	1–4	5–16	—	³⁰⁄₂₃₂	¹⁰⁄₁₄₃	33.9%	2.115	3.0
End Stone	1–4	—	—	¹⁰⁄₁₀₀	—	—	18.7%	0.500	5.3
Snow block	1–4	—	—	¹⁰⁄₁₀₀	—	—	18.7%	0.500	5.3
Soul Sand	1–4	—	—	¹⁰⁄₁₀₀	—	—	18.7%	0.500	5.3
Bucket	1	—	—	¹⁰⁄₁₀₀	—	—	18.7%	0.200	5.3
Budding Amethyst	1	—	—	¹⁰⁄₁₀₀	—	—	18.7%	0.200	5.3
Redstone Dust	—	—	8–32	—	—	¹⁰⁄₁₄₃	13.3%	2.797	7.5
Slimeball	—	—	8–32	—	—	¹⁰⁄₁₄₃	13.3%	2.797	7.5
Lapis Lazuli	—	—	5–32	—	—	¹⁰⁄₁₄₃	13.3%	2.587	7.5
Nether quartz	—	—	5–32	—	—	¹⁰⁄₁₄₃	13.3%	2.587	7.5
Prismarine Shard	—	—	2–16	—	—	¹⁰⁄₁₄₃	13.3%	1.259	7.5
Bone Block	—	—	1–8	—	—	¹⁰⁄₁₄₃	13.3%	0.629	7.5
Prismarine Crystals	—	—	1–8	—	—	¹⁰⁄₁₄₃	13.3%	0.629	7.5
Air	—	—	1–4	—	—	¹⁰⁄₁₄₃	13.3%	0.350	7.5
Cow Spawn Egg	1	—	—	⁵⁄₁₀₀	—	—	9.7%	0.100	10.3
Lava Bucket	1	—	—	⁵⁄₁₀₀	—	—	9.7%	0.100	10.3
Villager Spawn Egg	1	—	—	⁵⁄₁₀₀	—	—	9.7%	0.100	10.3
Water bucket	1	—	—	⁵⁄₁₀₀	—	—	9.7%	0.100	10.3
Gunpowder	—	—	2–32	—	—	⁵⁄₁₄₃	6.8%	1.189	14.6
Glowstone Dust	—	—	1–8	—	—	⁵⁄₁₄₃	6.8%	0.315	14.6
Spider Eye	—	—	1–3	—	—	⁵⁄₁₄₃	6.8%	0.140	14.6
Ancient Debris	—	—	1	—	—	⁵⁄₁₄₃	6.8%	0.070	14.6
Diamond	—	—	1	—	—	⁵⁄₁₄₃	6.8%	0.070	14.6
Bamboo	—	2–4	—	—	⁵⁄₂₃₂	—	4.2%	0.129	23.5
Cocoa Beans	—	2–4	—	—	⁵⁄₂₃₂	—	4.2%	0.129	23.5
Nether Wart	—	2–4	—	—	⁵⁄₂₃₂	—	4.2%	0.129	23.5
Sea Pickle	—	2–4	—	—	⁵⁄₂₃₂	—	4.2%	0.129	23.5
Sugar Cane	—	2–4	—	—	⁵⁄₂₃₂	—	4.2%	0.129	23.5
Cactus	—	1–4	—	—	⁵⁄₂₃₂	—	4.2%	0.108	23.5
Carrot	—	1–4	—	—	⁵⁄₂₃₂	—	4.2%	0.108	23.5
Dark Oak Sapling	—	1–4	—	—	⁵⁄₂₃₂	—	4.2%	0.108	23.5
Jungle sapling	—	1–4	—	—	⁵⁄₂₃₂	—	4.2%	0.108	23.5
Potato	—	1–4	—	—	⁵⁄₂₃₂	—	4.2%	0.108	23.5
Wheat seeds	—	1–4	—	—	⁵⁄₂₃₂	—	4.2%	0.108	23.5
Acacia sapling	—	1–2	—	—	⁵⁄₂₃₂	—	4.2%	0.065	23.5
Birch sapling	—	1–2	—	—	⁵⁄₂₃₂	—	4.2%	0.065	23.5
Cherry Sapling	—	1–2	—	—	⁵⁄₂₃₂	—	4.2%	0.065	23.5
Mangrove Propagule	—	1–2	—	—	⁵⁄₂₃₂	—	4.2%	0.065	23.5
Oak sapling	—	1–2	—	—	⁵⁄₂₃₂	—	4.2%	0.065	23.5
Spruce sapling	—	1–2	—	—	⁵⁄₂₃₂	—	4.2%	0.065	23.5
Beetroot seeds	—	1	—	—	⁵⁄₂₃₂	—	4.2%	0.043	23.5
Brown Mushroom	—	1	—	—	⁵⁄₂₃₂	—	4.2%	0.043	23.5
Chorus Flower	—	1	—	—	⁵⁄₂₃₂	—	4.2%	0.043	23.5
Fern	—	1	—	—	⁵⁄₂₃₂	—	4.2%	0.043	23.5
Glow Berries	—	1	—	—	⁵⁄₂₃₂	—	4.2%	0.043	23.5
Kelp	—	1	—	—	⁵⁄₂₃₂	—	4.2%	0.043	23.5
Melon Seeds	—	1	—	—	⁵⁄₂₃₂	—	4.2%	0.043	23.5
Moss Block	—	1	—	—	⁵⁄₂₃₂	—	4.2%	0.043	23.5
Mycelium	—	1	—	—	⁵⁄₂₃₂	—	4.2%	0.043	23.5
Pumpkin seeds	—	1	—	—	⁵⁄₂₃₂	—	4.2%	0.043	23.5
Red Mushroom	—	1	—	—	⁵⁄₂₃₂	—	4.2%	0.043	23.5
Sweet Berries	—	1	—	—	⁵⁄₂₃₂	—	4.2%	0.043	23.5
Cobweb	1–4	—	—	²⁄₁₀₀	—	—	3.9%	0.100	25.3
Echo Shard	1–4	—	—	²⁄₁₀₀	—	—	3.9%	0.100	25.3
Elytra	1	—	—	²⁄₁₀₀	—	—	3.9%	0.040	25.3
Powder Snow Bucket	1	—	—	²⁄₁₀₀	—	—	3.9%	0.040	25.3
Pufferfish Bucket	1	—	—	²⁄₁₀₀	—	—	3.9%	0.040	25.3
Sculk Catalyst	1	—	—	²⁄₁₀₀	—	—	3.9%	0.040	25.3
Sheep Spawn Egg	1	—	—	²⁄₁₀₀	—	—	3.9%	0.040	25.3
Spyglass	1	—	—	²⁄₁₀₀	—	—	3.9%	0.040	25.3
Turtle Egg	1	—	—	²⁄₁₀₀	—	—	3.9%	0.040	25.3
Golden Apple	1	—	—	²⁄₁₀₀	—	—	3.9%	0.040	25.3
Diamond Pickaxe^[F]	1	—	—	²⁄₁₀₀	—	—	3.9%	0.040	25.3
Nautilus Shell	—	—	1–4	—	—	²⁄₁₄₃	2.8%	0.070	36.1
Ghast Tear	—	—	1–3	—	—	²⁄₁₄₃	2.8%	0.056	36.1
Rabbit's Foot	—	—	1–3	—	—	²⁄₁₄₃	2.8%	0.056	36.1
Packed Air	—	—	1	—	—	²⁄₁₄₃	2.8%	0.028	36.1
Brain Coral Block	1–4	—	—	¹⁄₁₀₀	—	—	2.0%	0.050	50.3
Bubble Coral Block	1–4	—	—	¹⁄₁₀₀	—	—	2.0%	0.050	50.3
Fire Coral Block	1–4	—	—	¹⁄₁₀₀	—	—	2.0%	0.050	50.3
Horn Coral Block	1–4	—	—	¹⁄₁₀₀	—	—	2.0%	0.050	50.3
Tube Coral Block	1–4	—	—	¹⁄₁₀₀	—	—	2.0%	0.050	50.3
Bell	1	—	—	¹⁄₁₀₀	—	—	2.0%	0.020	50.3
Heart of the Sea	1	—	—	¹⁄₁₀₀	—	—	2.0%	0.020	50.3
Sniffer Egg	1	—	—	¹⁄₁₀₀	—	—	2.0%	0.020	50.3
Ender Pearl	—	2–4	—	—	²⁄₂₃₂	—	1.7%	0.052	58.3
Spore Blossom	—	1	—	—	²⁄₂₃₂	—	1.7%	0.017	58.3
Wither Skeleton Skull	—	3	—	—	¹⁄₂₃₂	—	0.9%	0.026	116.3
Allium	—	1	—	—	¹⁄₂₃₂	—	0.9%	0.009	116.3
Azure Bluet	—	1	—	—	¹⁄₂₃₂	—	0.9%	0.009	116.3
Big Dripleaf	—	1	—	—	¹⁄₂₃₂	—	0.9%	0.009	116.3
Blue Orchid	—	1	—	—	¹⁄₂₃₂	—	0.9%	0.009	116.3
Cornflower	—	1	—	—	¹⁄₂₃₂	—	0.9%	0.009	116.3
Crimson Nylium	—	1	—	—	¹⁄₂₃₂	—	0.9%	0.009	116.3
Dandelion	—	1	—	—	¹⁄₂₃₂	—	0.9%	0.009	116.3
Large Fern	—	1	—	—	¹⁄₂₃₂	—	0.9%	0.009	116.3
Lilac	—	1	—	—	¹⁄₂₃₂	—	0.9%	0.009	116.3
Lily of the Valley	—	1	—	—	¹⁄₂₃₂	—	0.9%	0.009	116.3
Orange Tulip	—	1	—	—	¹⁄₂₃₂	—	0.9%	0.009	116.3
Oxeye Daisy	—	1	—	—	¹⁄₂₃₂	—	0.9%	0.009	116.3
Peony	—	1	—	—	¹⁄₂₃₂	—	0.9%	0.009	116.3
Pink Petals	—	1	—	—	¹⁄₂₃₂	—	0.9%	0.009	116.3
Pink Tulip	—	1	—	—	¹⁄₂₃₂	—	0.9%	0.009	116.3
Pointed Dripstone	—	1	—	—	¹⁄₂₃₂	—	0.9%	0.009	116.3
Poppy	—	1	—	—	¹⁄₂₃₂	—	0.9%	0.009	116.3
Red Tulip	—	1	—	—	¹⁄₂₃₂	—	0.9%	0.009	116.3
Rose Bush	—	1	—	—	¹⁄₂₃₂	—	0.9%	0.009	116.3
Sunflower	—	1	—	—	¹⁄₂₃₂	—	0.9%	0.009	116.3
Warped Nylium	—	1	—	—	¹⁄₂₃₂	—	0.9%	0.009	116.3
White Tulip	—	1	—	—	¹⁄₂₃₂	—	0.9%	0.009	116.3

↑ The size of stacks (or for unstackable items, number) of this item on any given roll.
↑ The weight of this item relative to other items in the pool.
↑ The odds of finding any of this item in a single chest.
↑ The number of items expected per chest, averaged over a large number of chests.
↑ The average number of chests the player should expect to search to find any of this item.
↑ All enchantments are equally probable, including treasure enchantments (except Soul Speed, Swift Sneak, and Wind Burst), and any level of the enchantment is equally probable.

Blocks

The structure contains the following blocks:

The dropper that activates the structure building has a special tag 'Lunar', and can be obtained through the command setblock ~ ~ ~ dropper{Lunar:1b}, and can be activated by a light weighted pressure plate or heavy weighted pressure plate placed above it.

Sounds

Sounds
Sound	Subtitles	Source	Description	Resource location	Translation key	Volume	Pitch	Attenuation distance
	Explosion	Blocks	When a lunar base is activated	`entity.generic.explode`	`subtitles.entity.generic.explode`	4.0	0.56-0.84	16
	None^{[sound 2]}	Blocks	When the copper ball appears	`ambient.basalt_deltas.mood`	None^{[sound 2]}	0.2	1.0	16
	Fireball whooshes	Blocks	When the copper ball begins moving down	`item.firecharge.use`	`subtitles.item.firecharge.use`	0.4	1.4	16
	Beacon power selected	Blocks	When the copper ball collides with the lunar base	`block.beacon.power_select`	`subtitles.block.beacon.power_select`	1.0	1.4	16
	Beacon activates	Blocks	When a copper arm extends	`block.beacon.activate`	`subtitles.block.beacon.activate`	0.3, 0.8 ^{[sound 1]}	0.3-0.6, 1.5-2.0 ^{[sound 1]}	16
	Sculk spreads	Blocks	When copper spleaves are generated	`block.sculk.spread`	`subtitles.block.sculk.spread`	0.6	0.45-0.63	16
	Block placed	Blocks	When soul lanterns, polished blackstone buttons, shulker boxes, end rods, or chests are generated	`block.nether_wood.place`	`subtitles.block.generic.place`	0.6	0.6-0.8	16

↑ ^a ^b Plays simultaneously
↑ ^a ^b MC-179833

Data values

ID

Java Edition:

Configured feature	Identifier
[No displayed name]	`lunar_base`

Issues

Issues relating to "Lunar Base" are not maintained on the bug tracker because it is an April Fools' joke, and is therefore not in the newest stable version or snapshot. Issues reported there are closed as "Invalid".

Trivia

The "ACME" at the beginning of the lunar base's full name is likely a reference to the "Acme" threading put at the beginning of various' companies' names in the late 19th and early 20th centuries as a way of having said companies' names appear near the top of alphabetical lists, popularized as a generic company name by the fictional Acme Corporation of the Wile E. Coyote and the Road Runner cartoons.
- While stylized as an acronym in-game, the term "acme" comes from the Greek ἀκμή (acmḗ), meaning "peak", "zenith" or "prime", though backronyms such as "A Company Making Everything" and "An American Company that Manufactures Everything" are popular folk etymologies.
At the time of releasing the snapshot, the Lunar Laboratory Equipment loot table was the largest among all loot tables in the game.

Gallery

The lunar base in a structure block.
During the progress of building the enormous lunar base.
Ditto.
Ditto.
Ditto.
Ditto.
Ditto.
The enormous lunar base.
The loot chest of the enormous lunar base.
The shulker box loot of the enormous lunar base.
The enormous lunar base when the repeating command block with the command kill @e[type=block_display] is set to "Always Active". Note that the player is holding a barrier.
The lunar base located alongside a group of moon cows with the earth visible in the background