Last updated: 18 August 2026

Minecraft Sulfur Caves Chaos Cubed Update Guide

Chaos Cubed shipped June 16, 2026 as Java Edition 26.2 and Bedrock Edition 26.30, and its centerpiece is a brand-new underground biome: Sulfur Caves. Between the bouncy Sulfur Cube mob, geysers that launch you into the air, and two full sets of new building blocks, there's a lot to take in the first time you fall into one. Here's what the biome actually contains and how each new mechanic works.

01Where to Find Sulfur Caves

Sulfur Caves are an underground biome that generates in bands of sulfur and cinnabar blocks, alongside pools containing potent sulfur. Above ground, the biome creates visible sulfur springs in four size variants — small, medium, large, and extra large — so a cluster of yellow, bubbling pools on the surface is a strong sign there's a Sulfur Cave system underneath.

Like other cave biomes, the fastest way in is still digging or caving through existing tunnels until the yellow-and-red sulfur/cinnabar blocks start showing up. Cave spiders spawn here alongside the new Sulfur Cube mob, so bring combat gear, not just a pickaxe.

02The Sulfur Cube Mob: How It Works

The Sulfur Cube is a passive mob with 8 health points that spawns the way hostile mobs do (in the dark, within the biome) but won't attack you. It moves by jumping, similar to a slime.

• Absorbing blocks: hold a block and interact with a Sulfur Cube to feed it that block. It absorbs the block and enters an unmoving, damage-immune state — while absorbed, you can knock the cube around like a ball.
• Archetypes: what the cube absorbs changes its behavior. Twelve archetypes exist in total, including regular, bouncy, sticky, explosive, and hot variants, depending on the block you fed it.
• Shearing: use shears on an absorbed Sulfur Cube to remove the block it's holding and get the cube back to its normal state.
• Splitting and growing: killing a Sulfur Cube splits it into two smaller cubes. A small cube grows into a large one on its own after about 20 minutes; feeding it slimeballs speeds that timer up.

Feeding a Sulfur Cube TNT and setting it off unlocks the new "Uh Oh" advancement — worth doing once just for the achievement, but stand well back first.

03New Blocks: Sulfur and Cinnabar

Both new materials come in full block families, matching the pattern Minecraft already uses for stone-type blocks: a base block, stairs, slabs, walls, a polished variant, bricks, and a chiseled variant. Cinnabar is the red-colored counterpart to sulfur's yellow, and both are purely decorative building materials — pick whichever fits your build's color palette.

The biome also generates Sulfur Spikes: stalactite and stalagmite formations that grow out of sulfur blocks, similar to dripstone spikes in other cave biomes.

Potent Sulfur is different from the two building materials above — it's a functional block that generates in the biome's water pools and drives the geyser mechanic covered next.

04Geysers: How the Launch Mechanic Works

Geysers form where potent sulfur sits beneath 1 to 4 water source blocks with magma underneath. A full cycle runs 15 to 60 seconds between eruptions, and each eruption itself lasts 1 to 5 seconds, launching any player, mob, or item standing on top straight up.

Launch height scales with how much water sits above the potent sulfur — each water source block adds roughly 7 blocks of extra height to the eruption. If lava is underneath the potent sulfur instead of magma, the geyser erupts continuously rather than on a timer.

Practically: geysers are a free (if chaotic) way to gain height inside a cave system, and a genuine hazard if you're not expecting one — falling from a 20+ block launch without fall protection will kill you the same as any other fall.

05New Music: Bounce and Five Ambient Tracks

Chaos Cubed adds a new music disc, Bounce, which drops from mineshaft chests found inside Sulfur Caves — there's no crafting recipe, so it's loot-only. Five new ambient background tracks by composer fingerspit were also added to the game's music pool: "Memories," "Ebb," "Home," "Shores," and "Nightly." These play in normal world ambience rotation, not tied specifically to the new biome.

06Other Chaos Cubed Changes Worth Knowing

• An experimental Vulkan renderer was added on Java Edition as an alternative to OpenGL (requires Vulkan 1.2 with dynamic rendering and push descriptors), togglable in video settings with automatic fallback to OpenGL if it crashes. It's opt-in and experimental — leave it off unless you're specifically testing it.
• A new friends list was added, accessible from the title screen or pause menu (default keybind O), showing friend presence and requests.
• Beds now bounce entities that land on them at 75% of the impact velocity, and beds/signs/hanging signs switched from entity models to block models.
• A new death message — "died because not just the floor is lava" — was added for dying to a Sulfur Cube carrying the Hot archetype (one that's absorbed a magma block).
• This is a game drop, not a full version bump: it follows March 2026's Tiny Takeover update (baby mob overhaul) and doesn't touch anything from that update — see our Tiny Takeover guide if you're catching up on both at once.