Slime

The slime is one of those mobs that teaches you Minecraft has a sense of humor. It is a bouncing, translucent green cube that splits into smaller copies of itself when you kill it — like some kind of cursed matryoshka doll that wants you dead. Slimes spawn deep underground in specific chunks and on the surface of swamp biomes at night, and they come in three sizes: large, medium, and small. Only the small ones are harmless. The other two will bounce into you with surprising enthusiasm and knock you into whatever hazard happens to be nearby.

What makes slimes genuinely interesting — and occasionally infuriating — is their spawning mechanics. They do not just appear anywhere underground. They spawn in specific “slime chunks,” which are predetermined 16×16 areas based on the world seed. This means you could mine for hours and never see one, or you could stumble into a slime chunk and suddenly feel like you are starring in a low-budget horror film about sentient gelatin. The chunk-based spawning system is completely invisible in-game, so unless you use an external tool or do some seed math, finding them underground is a guessing game.

Slimes are primarily farmed for slimeballs, which are essential for crafting sticky pistons, leads, slime blocks, and magma cream. If you have ever built anything with redstone that involves pushing blocks around, you have needed slimeballs. They are one of those resources that seems unimportant until you suddenly need 64 of them and realize you have exactly zero.

Overview / Quick Stats

Appearance

A slime is a translucent green cube with a darker green core visible through its outer layer. It has two flat, dark green eyes and a wide mouth rendered on its front face, giving it this permanently vacant expression that somehow manages to look both goofy and menacing at the same time.

Slimes come in three sizes, and each one is a perfect cube scaled up or down. The large slime is roughly two blocks tall and wide — big enough to fill a hallway and block your escape route. The medium slime is about one block, and the small slime is about half a block. All three sizes share the same model, just rescaled. There are no texture differences between them.

The bouncing animation is the slime’s signature move. It compresses slightly on landing and stretches vertically when jumping, giving it this squishy, gelatinous look despite being made of blocks. The translucent outer layer also jiggles slightly during movement, which is a nice touch for a mob that is essentially a hostile cube of jelly.

Behavior & AI

• Targeting: Large and medium slimes target the nearest player within 16 blocks. Small slimes (size 1) do not target or attack players — they just bounce around aimlessly like confused green peas.
• Movement: Slimes move exclusively by jumping. They cannot walk, sprint, or strafe. When idle, they jump in random directions every few seconds. When targeting a player, they jump directly toward the target more frequently. This means they can be kited fairly easily — just keep moving and they will awkwardly bounce behind you.
• Pathfinding: Slimes have limited pathfinding ability. They jump toward their target in a straight line and do not navigate around obstacles intelligently. They will happily bounce off a wall repeatedly if it is between them and you. They can, however, climb over blocks naturally through their jumping movement.
• Water behavior: Slimes can swim. They float in water and continue jumping to stay at the surface. They do not drown. This is important for swamp-based encounters — they will follow you right into the water.
• Despawning: Slimes follow standard hostile mob despawn rules. They despawn if no player is within 128 blocks and have a chance to despawn if no player is within 32 blocks. Slimes with persistence (name-tagged or from spawners with Persistence NBT) do not despawn.
• Splitting on death: When a large slime is killed, it spawns 2-4 medium slimes. When a medium slime is killed, it spawns 2-4 small slimes. Small slimes do not split further. This means killing one large slime can generate up to 16 small slimes in total. Plan accordingly.
• Light level independence: Unlike most hostile mobs, slimes in slime chunks can spawn regardless of light level. Underground slime spawns ignore light entirely. Swamp slimes require light level 7 or less, consistent with other hostile mob spawning rules.

Abilities, Attacks & Status Effects

• Attack type: Contact damage. Slimes deal damage by jumping into players. There is no projectile, no special attack animation — they just bonk you with their body. It is strangely undignified.
• Attack range: Melee only. Slimes must physically collide with you to deal damage. The larger the slime, the larger the hitbox, so large slimes have a deceptively wide contact area.
• Damage scaling: Damage scales directly with size. Large slimes deal 4 damage (2 hearts) on Normal, medium slimes deal 2 damage (1 heart), and small slimes deal 0 damage. On Hard, large slimes deal 6 damage (3 hearts).
• Knockback: Slimes apply knockback when they land on or collide with a player. Combined with their bouncing movement, this can push you into lava, off cliffs, or into other mobs — which is usually how slimes actually kill experienced players.
• Status effects: Slimes do not inflict any status effects. No poison, no slowness, just raw blunt force from a sentient gelatin cube.
• Immunities: Slimes take no fall damage. They can bounce off any height and land without taking a scratch. They are not immune to fire, lava, drowning, or any other damage source.
• Shield interaction: Shields block slime contact damage normally.

Variants, Jockeys & Special Forms

Size Variants

• Large slime (size 4): The biggest natural spawn. Two blocks in each dimension, 16 health, deals damage, and splits into 2-4 medium slimes on death. This is the one that blocks hallways underground and makes you reconsider your life choices.
• Medium slime (size 2): About one block in each dimension. 4 health, still deals damage, splits into 2-4 small slimes on death. Annoying in numbers.
• Small slime (size 1): Half a block. 1 health, deals no damage, drops slimeballs. These are what you actually want. They are basically loot piñatas.

Slime Jockeys

• Chicken jockey variant: In Java Edition, small slimes can rarely spawn riding a chicken, creating a slime chicken jockey. This is exceptionally rare and mostly just confusing to encounter. The slime rides the chicken, the chicken walks around, and the whole thing looks like a fever dream.

Custom Sizes

• Commands only: Using the Size NBT tag, slimes can be summoned at any size from 0 to 126. A size-126 slime is enormous — roughly 127 blocks in each dimension — and will obliterate anything in its path. This is strictly a commands/creative mode novelty, but it is spectacular.

Spawning

Interactions with Environment & Other Mobs

• Iron golems: Iron golems attack slimes on sight. Slimes do not specifically target iron golems, but they will bounce toward them if the golem is the nearest entity. This interaction makes iron golems useful in slime farm designs for automatic killing.
• Snow golems: Snow golems throw snowballs at slimes, which deal knockback but no damage. This can be useful for pushing slimes into kill chambers but not for actually killing them.
• Wolves and cats: Slimes do not have any special interactions with wolves or cats. Wolves do not attack slimes, and slimes ignore tamed animals.
• Fall damage immunity: Slimes take no fall damage, which means they can spawn or jump off underground cliffs and land without losing health. This is relevant when building farms — you cannot use fall damage as a killing method for slimes.
• Boats and minecarts: Slimes can be pushed into boats and minecarts. Once inside, they cannot jump and are effectively trapped. This can be used for transport or containment, though it is not commonly practical.
• Magma blocks: Slimes are not immune to magma block damage. They take 1 damage per half-second when standing on magma blocks, which makes magma blocks a viable killing floor for slime farms.
• Campfires: Slimes take fire damage from campfires, making campfires another option for farm kill methods, though slower than magma blocks or lava.

Drops & Loot

Player Uses & Farming

• Slimeball uses: Slimeballs are used to craft sticky pistons (essential for nearly all redstone contraptions that move blocks), leads (for transporting animals), slime blocks (bouncy, sticky, and used in flying machines), and magma cream (combined with blaze powder, used for fire resistance potions). If you build with redstone, slimeballs are non-negotiable.
• Slime block mechanics: Slime blocks are one of the most versatile redstone components in the game. They stick to adjacent blocks when pushed by pistons (except glazed terracotta, which they slide past), bounce entities that land on them, and negate fall damage. They are the backbone of flying machines, TNT duplicators, and dozens of other contraptions.
• Slime chunk farms: The most reliable slime farm design involves finding a slime chunk, excavating a large area below Y=40, lighting the space to prevent other hostile mobs from spawning, and using either iron golems or magma blocks to kill the slimes. The AFK spot should be 24-32 blocks away from the spawning platforms for optimal spawn rates. Key principle: slimes spawn regardless of light level in slime chunks, so torch-spamming the area only removes competition from other mobs.
• Swamp surface farms: Swamp-based slime farms are simpler to build but less consistent. They only work at night, are affected by moon phase (full moon is best, new moon produces zero spawns), and compete with all other surface hostile mob spawns. They are a decent early-game option before you locate slime chunks.
• Finding slime chunks: In Java Edition, slime chunks can be found using the world seed and an external tool like Chunkbase. In Bedrock Edition, the algorithm is different, but Chunkbase supports both editions. Alternatively, you can dig out large underground areas and wait to see where slimes spawn naturally — this is slower but requires no external tools.
• Farm kill methods: Magma blocks, campfires, lava (with careful control to not destroy drops), iron golems, and player-kill setups all work. Remember that slimes are immune to fall damage, so drop-based killing is not an option. Magma blocks are the most common choice because they are cheap, effective, and do not destroy item drops.
• Expected rates: A well-built single-chunk slime farm can produce roughly 2,000-4,000 slimeballs per hour depending on design and edition. Multi-chunk farms scale proportionally. Bedrock rates tend to be slightly different due to spawning algorithm differences.

Commands & NBT

Here are the most useful commands for working with slimes. The Size tag controls the slime’s size, where 0 = smallest (size 1 in-game), 1 = medium, and 3 = large. Yes, the internal Size value is one less than what you might expect.

/summon minecraft:slime ~ ~ ~ {Size:3}

Summons a large slime at your position.

/summon minecraft:slime ~ ~ ~ {Size:0}

Summons a small slime — the kind that drops slimeballs and does not fight back.

/summon minecraft:slime ~ ~ ~ {Size:10}

Summons a comically large slime. Size 10 is roughly 11 blocks in each dimension. Great for screenshots, terrible for server performance.

/summon minecraft:slime ~ ~ ~ {Size:3,NoAI:1b}

Summons a large slime that cannot move or attack. Useful for displays or mob showcases.

/summon minecraft:slime ~ ~ ~ {Size:1,Passengers:[{id:"minecraft:zombie"}]}

Summons a medium slime with a zombie riding it. Because why not.

• Size (int): Determines the slime’s size. Internal value 0 = smallest in-game size (size 1). Internal value 3 = largest natural spawn (size 4 in-game). Maximum value is 126.
• wasOnGround (byte): Tracks whether the slime was on the ground during its last tick. Used internally for jump AI calculations.

Tags, Gamerules & Datapack Hooks

• Entity type tag: minecraft:slime is not included in any default entity type tag group. It does not appear in #minecraft:raiders, #minecraft:undead, or any other standard tag.
• Mob category: Slimes count toward the hostile mob cap in Java Edition (monster category). In slime chunks, they use a separate spawning attempt but still count against the cap once spawned.
• Gamerule — doMobSpawning: Setting this to false prevents all slime spawning, including in slime chunks and swamps.
• Gamerule — mobGriefing: Does not affect slimes, as they do not modify blocks.
• Loot table path: minecraft:entities/slime — Controls drops for all slime sizes. Only small slimes produce slimeball drops by default.
• Spawn egg: The slime spawn egg is available in Creative mode and always spawns a large slime (size 3 internally).

Difficulty & Edition Differences

• Easy: Large slimes deal 3 damage (1.5 hearts). Medium slimes deal 2 damage (1 heart). Small slimes deal 0.
• Normal: Large slimes deal 4 damage (2 hearts). Medium slimes deal 2 damage (1 heart). Small slimes deal 0.
• Hard: Large slimes deal 6 damage (3 hearts). Medium slimes deal 3 damage (1.5 hearts). Small slimes deal 0.
• Java vs. Bedrock — slime chunks: The algorithm for determining slime chunks is different between editions. The same world seed will produce different slime chunk locations in Java and Bedrock. This is one of the most common sources of confusion for players who switch between editions.
• Java vs. Bedrock — swamp spawning: In Bedrock Edition, slimes also spawn on the surface in Mangrove Swamp biomes, which they do not in Java Edition.
• Java vs. Bedrock — spawn cap: Bedrock Edition handles mob spawning caps differently, which can result in different effective slime spawn rates even with identical farm designs.
• Moon phase: Both editions scale swamp slime spawn rates with the moon phase. Full moon has the highest rates, new moon has zero. This only applies to swamp/surface spawns — slime chunk spawning underground is unaffected by moon phase.

Sounds & Audio

• Jump (large): entity.slime.jump
• Jump (small): entity.slime.jump_small
• Squish (large): entity.slime.squish — Plays on landing after a jump.
• Squish (small): entity.slime.squish_small
• Attack: entity.slime.attack — Plays when a slime deals contact damage to a player.
• Hurt: entity.slime.hurt
• Death (large/medium): entity.slime.death — Followed immediately by split sounds.
• Death (small): entity.slime.death_small

The slime’s squelching, bouncy sound effects are some of the most distinctive in the game. If you hear wet squishing noises while mining underground, you are either near a slime chunk or your headphones are broken. Probably the slime chunk thing.

History & Major Changes

• Alpha v1.0.11 (2010): Slimes were added to the game. They spawned only in the lowest 16 layers of the map in specific chunks. They were extremely rare and most players never encountered one.
• Beta 1.4: Slimes became slightly more common, though still rare enough that many players had never seen one.
• 1.4.2 (Pretty Scary Update): Slimes gained the ability to spawn in swamp biomes at night. This was a massive change — it gave players a reliable surface source for slimeballs for the first time. Spawn rates were tied to moon phase.
• 1.5 (Redstone Update): Slime blocks were not added yet, but sticky pistons (crafted with slimeballs) became increasingly important, driving demand for slime farms.
• 1.8: Slime blocks were added, making slimeballs one of the most important resources in the game for redstone builders. Flying machines, bounce pads, and dozens of new contraptions became possible.
• 1.18 (Caves & Cliffs Part 2): World generation depth extended to Y=-64. Slime chunks now spawn slimes from Y=-64 to Y=40, dramatically increasing the vertical range available for slime farms. This was a big buff to slime farm efficiency.

Notable Bugs & Quirks

• Slime chunk persistence: Slime chunks are determined by the world seed and never change, even if the biome at that location changes. A slime chunk in a desert, an ocean, or a mushroom island is still a slime chunk. The biome is irrelevant for underground slime spawning.
• Split direction randomness: When a slime splits, the smaller slimes are launched in random horizontal directions. Occasionally, they clip through walls or end up in spaces they should not fit. This is a known quirk and can cause slimes to escape poorly designed farm enclosures.
• Size 0 slimes: A slime with internal Size tag 0 is the smallest possible — this is what naturally spawned “small” slimes use. A slime summoned with Size -1 or lower may cause visual glitches or crashes depending on the version. Do not try this on servers you care about.
• Spawn rate inconsistency: Slime spawn rates can feel wildly inconsistent between play sessions. This is normal — it is a product of the mob cap system, random spawn attempts, and whether nearby caves are loaded with other hostile mobs eating up the cap. Light up surrounding caves to improve rates.

Advancements / Achievements

• Monster Hunter (Java): Kill any hostile mob — slimes (large and medium sizes) count toward this advancement.
• Monsters Hunted (Java): Kill one of every hostile mob — slimes must be included. Specifically, you need to kill a slime (any hostile size counts).
• Adventure (Java): Kill any entity or be killed by one — slimes qualify.
• Monster Hunter (Bedrock): Kill a hostile mob — any hostile slime size counts.

Spin-offs, Culture & Trivia

• Inspiration: The slime’s design and splitting mechanic are directly inspired by classic RPG slime enemies, most notably the slime from Dragon Quest. The “defeat it and it becomes smaller copies” trope is a staple of fantasy gaming.
• Slime as decoration: Small slimes (size 1) are a popular choice for builds and displays because they are harmless, small, and have that endearing bouncing animation. Name-tagging a small slime and keeping it as a pet is surprisingly common in the community.
• Cultural status: Slimes are one of Minecraft’s most recognizable mobs. The slime block’s bouncing and sticky mechanics have made it iconic in the redstone community, and slime farms are considered a rite of passage for technical players.
• Minecraft Dungeons: Slimes appear as enemies in Minecraft Dungeons with similar splitting behavior but adapted for the action RPG gameplay.
• Merchandise: Slimes feature prominently in official Minecraft merchandise, including plush toys, figures, and apparel. Their simple cube design makes them one of the easiest mobs to replicate in physical form.
• The sound effect: The slime’s squelching bounce sound is one of the most instantly recognizable audio cues in Minecraft. Hearing it while caving is either exciting (free slimeballs) or terrifying (what is bouncing toward me in the dark), depending on your preparedness.

See Also

• Magma Cube — The Nether counterpart to the slime, with similar splitting behavior but fire immunity and different drops.
• Slime Block — The block crafted from slimeballs, essential for redstone contraptions and flying machines.
• Sticky Piston — Crafted with a slimeball and a piston, the foundation of most block-moving redstone builds.
• Lead — Crafted with slimeballs and string, used for transporting animals.
• Iron Golem — Commonly used in slime farm designs to automatically kill slimes.