SLIME BLOCK
A bouncy transparent block that sticks to adjacent blocks when pushed or pulled by pistons. Forms the backbone of flying machines. Entities bounce when landing on it.
Crafting Recipe
9 Slime Balls → 1 Slime Block
Signal Behavior
Input
InputNone (passive, moved by pistons)
Output
OutputNone
Max Signal Strength
Max Signal Strength0
Delay
DelayN/A
Modes
- Sticky (attaches to adjacent blocks when piston moves)
Overview: what the Slime Block is and does
A bouncy transparent block that sticks to adjacent blocks when pushed or pulled by pistons. Forms the backbone of flying machines. Entities bounce when landing on it.
As a mechanical component it converts a redstone signal into physical action rather than passing the signal onward. Despite the slug, this is the Slime Block — the sticky, bouncy block that glues flying machines together.
The Slime Block was added to Minecraft in 1.8 and everything described here reflects its behaviour in Java Edition 1.21.
How it works: the redstone mechanics
On the input side, none (passive, moved by pistons). It returns no redstone signal of its own — its effect is a physical action in the world.
When a piston pushes or pulls it, it drags every block stuck to its faces along with it (up to the 12-block piston limit), which is how multi-block flying machines move as one unit. It sticks to almost everything except honey blocks and glazed terracotta, and entities bounce off it instead of taking fall damage.
It operates in the following modes: sticky (attaches to adjacent blocks when piston moves).
How to set it up
- 1Craft the Slime Block: 9 Slime Balls → 1 Slime Block.
- 2Decide where the signal needs to start or land, then place the Slime Block against a solid surface so it can act on the blocks in front of it.
- 3Feed it a redstone pulse or signal from a lever, button, or circuit; it will perform its action and ignore further power until the input changes.
- 4Test in a creative-mode plot first: trigger the input and confirm the Slime Block behaves exactly as the timing above predicts before committing it to a survival build.
Uses & applications
- ▸Flying machines
- ▸Piston doors
- ▸Player launchers
- ▸Block movers
- ▸Bouncy floors
Tips & common mistakes
- !Does not stick to honey blocks
- !Adds to piston push count (12 block limit)
- !Glazed terracotta is not pulled by slime blocks
- !It will not stick to a honey block, and that deliberate non-bond is exactly how slime-and-honey machines separate cleanly.
Slime Block FAQ
What is the Slime Block used for in Minecraft redstone?
The Slime Block is most often used for flying machines, piston doors, player launchers, and block movers. As a mechanical component it converts a redstone signal into physical action rather than passing the signal onward.
What signal strength does the Slime Block output?
The Slime Block does not output a redstone signal of its own; its result is none. Its purpose is physical action, not signal generation.
How do you craft the Slime Block?
9 Slime Balls → 1 Slime Block. It was introduced in 1.8.
What is the most common mistake with the Slime Block?
Does not stick to honey blocks. Adds to piston push count (12 block limit).