The sulfur cube is a passive, slime-like mob added in Minecraft 26.2 "Chaos Cubed." It spawns in sulfur caves, has 8 HP, and moves by jumping like a slime or magma cube. Its signature trick: interact with it while holding a full block, and it absorbs that block into its body. The absorbed block changes the cube's physics entirely, turning it into one of 12 distinct archetypes, from a bouncy rubber ball to a sliding hockey puck to a live TNT charge.
This guide covers the full mechanic set: where sulfur cubes spawn, how absorption and shearing work, every archetype, the two dangerous ones, and how to move and automate cubes with buckets and dispensers.
Tip. If a cube ends up with a block you don't want (or you just want to reset it to plain sulfur), shear it. Shearing removes the absorbed block and drops it as an item, same as it started.
Where to find one and basic behaviour
Sulfur cubes spawn in sulfur caves, the biome added alongside them in 26.2. They are passive: they will not attack you, but they still count against the hostile mob cap, which matters if you're running a mob farm nearby and wondering why spawns feel throttled.
A few behaviour notes worth keeping in mind:
- They despawn like other passive-but-capped mobs when players leave the area.
- Killing a cube splits it into two smaller cubes, the same way slimes and magma cubes split.
- They drop no loot on death. Combined with the split-on-death behaviour, killing sulfur cubes is generally a bad trade: keep them alive if you want to use them for anything.
- They seek out nearby dropped block items on the ground and absorb them automatically, and they will follow a player who is holding a block type they consider compatible.
How absorption works
The core interaction is simple: hold a full block and interact with (right-click) a sulfur cube. It absorbs the block into its body. From that point, the cube's movement and physics are governed by whatever archetype that block maps to.
A few extra rules around absorption:
- Shears remove it. Shearing an absorbed cube pops the block back out as a dropped item and returns the cube to its unmodified state.
- They chase holders. A cube will follow a player carrying a block it can absorb, similar to how slimes are attracted to players.
- They scavenge drops. A cube near a dropped block item on the ground will move toward it and absorb it without a player needing to interact directly.
- Dispensers work too. A dispenser loaded with a block, or with shears, can equip or strip a cube's absorbed block without a player standing there. This is the basis for any automated sorting or archetype-switching setup.
All 12 archetypes
The absorbed block's type determines which archetype the cube becomes. The wiki groups archetypes by a movement profile (speed, bounciness, ground friction, air drag) tied to underlying entity attributes introduced in 26.2.
| Archetype | Trigger block(s) | Behaviour |
|---|---|---|
| Regular | Concrete powder, mud, dirt, coal block | Medium speed, medium bounciness: the baseline profile. |
| Bouncy | Planks, logs, bamboo blocks | Fast speed, high bounciness, medium ground friction, low air drag. |
| Slow Bouncy | Stone-type blocks and ores | Slow speed, high bounciness, medium friction, medium air drag. |
| Fast Flat | Coral blocks, sponges, froglights | Fast speed, low bounciness, medium ground friction, low air drag. |
| Slow Flat | Metal blocks and ores | Slow speed, low bounciness, medium ground friction, medium air drag. |
| Light | Wool blocks | Slow speed, high bounciness, medium ground friction, high air drag: drifts more than it should for its speed. |
| Fast Sliding | Blue ice, packed ice, snow blocks | Fast speed, no bounciness, low ground friction, low air drag: slides a long way before stopping. |
| Slow Sliding | Mushroom blocks, mycelium | Slow speed, no bounciness, low ground friction, low air drag. |
| High Resistance | Soul sand, soul soil | Very slow movement, high friction, low bounce. |
| Sticky | Honeycomb | Extremely high ground friction, no bounce: barely slides at all once it lands. |
| Explosive | TNT | Turns the cube into a fused explosive. See below. |
| Hot | Magma block | Deals contact damage like a magma block. See below. |
For the movement archetypes, membership is decided by the game's internal block tags rather than one single hardcoded list, so treat the trigger blocks above as the confirmed representative examples rather than an exhaustive list of every valid block.
The dangerous ones
Two archetypes turn a normally harmless mob into a hazard.
Explosive. Feed a sulfur cube TNT and it becomes a walking bomb. Ignite it with fire or redstone and it gets a 6-second fuse (same as placed TNT lit conventionally). If it's set off by a separate explosion instead, the fuse is randomized between roughly 0.75 and 3 seconds, which is much less forgiving if you're standing nearby. Getting a cube to absorb TNT is also tracked directly: it unlocks the "Uh Oh" advancement.
Hot. Feed it a magma block and it deals contact damage exactly like a magma block does when a player or mob touches it. If it kills you, the death message reads "didn't just the floor is lava", a nod to the magma block meme.
Tip. A cube holding any absorbed block resists fall damage, player damage, and explosion damage. That resistance does not extend to lava, so don't assume an absorbed cube is safe to drop into a lava pool for any reason.
Moving and keeping cubes
Growth. Small sulfur cubes fed slimeballs grow into large cubes.
Bucket of Sulfur Cube. Once a cube is large, an empty bucket picks it up into a "Bucket of Sulfur Cube" item, the same pattern as bucketing an axolotl or tadpole. This is currently the only confirmed way to transport a cube without walking it there.
Despawn rule. Wild sulfur cubes despawn under normal passive-mob rules when no player is nearby. This is a reason to bucket one if you want to keep a specific archetype around long-term rather than hoping it survives.
Dispenser automation. Because dispensers can equip a block onto a cube or shear one clean, a setup that cycles different blocks through a dispenser next to a captured cube is the current basis for any kind of automated archetype-swapping or sorting rig. Treat this as a building block rather than a finished design: the community farm/contraption meta around sulfur cubes is still new and forming.
Why technical players care
Chaos Cubed introduced real entity attributes behind this mob: bounciness (0.0 to 1.0), air_drag_modifier, and friction_modifier. These aren't just flavor text for the archetype table, they're the same attribute system a new bounce game event hooks into (vibration frequency 2, firing whenever an entity collides with a bouncy block or entity), and beds now bounce entities at 75% of their impact velocity using the same underlying system.
Put together, this is the first real physics-attribute toolkit for entity bounce/slide/drag behaviour in vanilla Java. Redstone and technical players are already looking at Bouncy or Fast Sliding cubes as potential building blocks for launch, sorting, or momentum-based contraptions, and the fall/explosion damage immunity on an absorbed cube adds another angle for anyone thinking about safe transport rigs. Be honest with yourself that none of this has a settled farm or contraption design yet: it's early, and there is no established meta to follow.
FAQ
Are sulfur cubes hostile?
No. They are passive and will not attack you. They do still count toward the hostile mob cap, which can matter for nearby mob farms.
How do I get the block out of a cube?
Shear it. Shears remove an absorbed block from a sulfur cube and drop it as an item, resetting the cube to its base state. A dispenser loaded with shears can do this without a player present.
Can sulfur cubes explode?
Yes, if fed TNT. Igniting it with fire or redstone gives a 6-second fuse; setting it off via another explosion gives a randomized fuse between about 0.75 and 3 seconds. Feeding a cube TNT also unlocks the "Uh Oh" advancement.
How do I move a sulfur cube?
Grow it to large size by feeding slimeballs to a small cube, then pick it up with an empty bucket to get a Bucket of Sulfur Cube, which you can carry and place elsewhere.
Do sulfur cubes despawn?
Yes, wild ones despawn under normal passive-mob rules when players leave the area, the same as other capped mobs. Bucketing a cube is the way to hold onto a specific one indefinitely.
If you want the wider picture of what else 26.2 changed, start with the Minecraft 26.2 Chaos Cubed overview, and for where to actually find sulfur cubes in the world, see the sulfur caves guide.
Sources & further reading:
