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The Sulfur Cube is a passive mob from the Chaos Cubed update, and this page covers it end to end.
The cube lives in a new underground biome, the Sulfur Caves. They are easy to recognise: yellow sulfur, red cinnabar and hot sulfur lakes. Cave spiders spawn down there too, so it is worth bringing a weapon.
The core mechanic is absorption. The cube eats a full solid block and takes on its physics, turning into one of twelve archetypes with their own speed, bounciness, friction and buoyancy — from bouncy on a slime block to explosive on TNT. Shears pull the block back out and reset the cube, but once a TNT cube has been lit, nothing can be taken out of it any more.
The page also has a three-dimensional preview, cards for every archetype, a tour of the biome and a section on automation: the cube responds properly to dispensers, so archetype swapping can be built as a machine. Useful details: a big cube is caught with an empty bucket, like a fish; a small one cannot be caught; it grows up in exactly twenty minutes, and a big one splits into two small ones when it dies.
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