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Slimeballs are an essential component in many later versions of Minecraft, capable of producing Sticky Pistons, Leads, Magma Cream, and Slime Blocks. But Slimes are one of the rarest monster spawns in the game, so building a Slime Farm can dramatically increase the rate at which you collect Slimeballs.
The basic concept of building a slime farm is simple. You need to find a piece of slime, dig up the whole piece, create platforms for the slimes to appear, and then have an efficient way to kill the slimes and collect the slime balls.
However, the actual task of building it can be dangerous and difficult. You'll need a lot of Totems of Undying, be good enough to grab a bucket of water, or have a way to prevent fall damage, mobs, etc. from killing you.
Find a piece of slime and extract it
The first thing you're going to want to do is find a piece of slime and extract it whole. Use our guide to Slime Chunks to learn how it works. In the examples I used, I had a pair of slime pieces side by side, so I extracted two whole pieces.
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This is by far the longest part of the process. If you have a way to speed up the process, like a beacon or highly enchanted pickaxes, you'll definitely want to.
You need to dig down to the first level of bedrock. Slimes spawn between Y level 0 and 40, in a Slime Chunk, so you'll need to drop down to that level.
Related: How to Get Slimeballs in Minecraft
Build platforms for slimes to spawn
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Using slabs, placed on the underside of a block, you will want to create a base for your spawner. Build it level just above the bedrock. It's also a good idea to fill in all bedrock gaps so that small slimes can't appear below your spawner. Also, be sure to light up this area to prevent monsters from spawning.
Then, from Y level 8, you will have to create a platform with Slabs. This platform is a spawning platform and the slabs will need to be placed at the top level of a block. This will allow slimes to spawn. Build an additional platform every 2,5 blocks, with the slab always on top of a block.
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You need to illuminate these spawning areas as much as possible. Slimes can spawn at high light levels, but other mobs cannot, which means you'll be preventing non-slime mobs from spawning. I used torches, but using Jack o Lanterns or Sea Lanterns will work fine as Slimes can spawn on both of these blocks.
Leave a space of three blocks on two edges of the platforms. This is where the slimes will drop to be harvested.
Create a slime harvesting area
Using Magma Blocks, you will need to create a kill floor at the same level as the first spawn platform. This means that the slimes that fall, will land on the magma blocks, get damaged and die.
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To get rid of the slimes, they will need bait. Create alcoves on the open edges of the platforms and place iron golems in each one. Block them with slabs so they can't escape and the slimes can't hurt them. If a slime is within 16 blocks of a villager, player, or iron golem, they will try to attack it, so the slimes will move towards the iron golems, fall down, and be you are beautiful.
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Gather the slime
Under the magma blocks you will need to collect the Slimeballs using Hopper Minecarts. Hopper Minecarts pick up a block above and through a single layer of blocks, meaning they will collect Slimeballs that spawn when slimes die on magma.
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To achieve this, create a small track using motorized rails and a hopper placed above a chest to collect Slimeballs. Once done, add any extra features you want to your farm, such as lifts, more lighting, decoration, etc., and you'll have a fully functional mud farm. Enjoy!
Are you hesitating about pieces, extracting them and finding them? Check out How to See Chunk Borders in Minecraft on Pro Game Guides.
