Breeding

Breeding is how you unlock new slime types. It happens in the world: no machine and no randomness. The same parents with the same block nearby always give the same baby.

How to breed

1. Get two adult slimes (size 2 or more). See Slimes for growing them.
2. Place the catalyst block within 2 blocks of them, if the recipe needs one.
3. Right-click each slime with its own food. Each one then looks for a partner for 30 seconds.
4. When they meet, a size 1 baby appears between them.

Both parents then rest for 5 minutes before they can breed again. Feeding a resting slime does nothing; the game tells you how long it still needs.

Catalysts are not used up

Unless a recipe says otherwise, the catalyst block stays where it is, so one block can serve many breedings.

Which baby you get

The game checks the two parents and the blocks around them, in this order:

1. A recipe for these two parents whose catalyst is within 2 blocks.
2. A recipe for these two parents that needs no catalyst.
3. If both parents are the same type, a baby of that type.

If none of these match, the slimes don't breed and nothing is used up except the food. Order doesn't matter: Stone + Coal is the same as Coal + Stone.

This is why several recipes can share the same parents. Two Stone Slimes make Andesite next to Andesite, Granite next to Granite, Diorite next to Diorite, and more Stone Slimes with no catalyst at all.

All breeding recipes

Parents	Catalyst (within 2 blocks)	Baby	Tier
Stone + Stone	Andesite	Andesite	1
Sand + Oak	Cactus	Cactus	1
Stone + Stone	Calcite	Calcite	1
Mud + Sand	Clay	Clay	1
Stone + Oak	Coal Block	Coal	1
Stone + Stone	Deepslate	Deepslate	1
Stone + Stone	Diorite	Diorite	1
Stone + Stone	Granite	Granite	1
Sand + Stone	Gravel	Gravel	1
Dirt + Oak	Moss Block	Moss	1
Dirt + Dirt	Mud	Mud	1
Oak + Green	Oak Leaves	Oak Leaves	1
Sand + Sand	Red Sand	Red Sand	1
Green + Green	Snow Block	Snow	1
Stone + Stone	Tuff	Tuff	1
Mud + Moss	Brown Mushroom Block	Brown Mushroom	2
Stone + Coal	Copper Block	Copper	2
Stone + Mud	Dripstone Block	Dripstone	2
Snow + Snow	Ice	Ice	2
Stone + Coal	Netherrack	Netherrack	2
Sand + Clay	Prismarine	Prismarine	2
Mud + Moss	Red Mushroom Block	Red Mushroom	2
Deepslate + Netherrack	Basalt	Basalt	3
Deepslate + Netherrack	Blackstone	Blackstone	3
Copper + Stone	Iron Block	Iron	3
Netherrack + Coal	Magma Block	Magma	3
Sand + Netherrack	Soul Sand	Soul Sand	3
Dirt + Netherrack	Soul Soil	Soul Soil	3
Netherrack + Magma	Glowstone	Glowstone	4
Iron + Copper	Gold Block	Gold	4
Iron + Clay	Lapis Block	Lapis	4
Deepslate + Magma	Obsidian	Obsidian	4
Iron + Netherrack	Quartz Block	Quartz	4
Iron + Magma	Redstone Block	Redstone	4
Calcite + Glowstone	Amethyst Block	Amethyst	5
Gold + Lapis	Diamond Block	Diamond	5
Obsidian + Calcite	End Stone	End Stone	5
Diamond + Obsidian	Netherite Block	Netherite	6

38 breeding rules. Starting slimes found in the wild: Dirt, Oak, Sand, Green, Stone.

Planning a route

Every recipe only uses slimes from lower tiers, so you can always work your way up. For example, to get an Iron Slime:

1. Coal: Stone + Oak, next to a Block of Coal (or take a pair from a Slime Shrine)
2. Copper: Stone + Coal, next to a Block of Copper
3. Iron: Copper + Stone, next to a Block of Iron

The slime types page lists every type with its parents, so you can trace any route backwards.