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I'm having a hard time finding slimes to kill so that I can make some sticky pistons - I know that they only spawn at the bottom of the map, so I am restricting my search to this area, however I have only gotten 5 slimeballs since I started playing Minecraft!

What is the most efficient way to find, trap, and kill the blighters? Can I make a mob trap for them in the same way that I do for other creatures?

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up vote 13 down vote accepted

Any mob trap within 16 blocks of the bottom of the map will catch slimes as well, but you have to be careful to not hurt the slimes too much to get them to split the most. Punching and drowning are the safest ways to ensure that they'll split into more slimes. Also, you want a large room so that bigger slimes will spawn which can then have more splits.

The most important thing besides the depth is that it's in a chunk suitable for slimes. Slimes can only spawn in 10% of the chunks, picked randomly depending on the seed. You can calculate which chunks are suitable with this tool by trunkz though:

They only spawn a tenth as often as other mobs, but they'll also spawn in any light level, so if you're digging for diamonds at bedrock level, you'll usually find quite a few naturally.

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I think this could be a little clearer - any mob trap in slime chunks between levels 39 and 0 will spawn slimes. You can also do things in swamp biomes, however, since they can only spawn on the ground there, your potential spawning spaces are reduced. – Unionhawk Dec 22 '14 at 23:52

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