A round, dark room in a swamp where slimes spawn without a slime chunk. They jump towards an iron golem, fall into a shaft onto magma blocks, and a hopper minecart collects the slimeballs.
This design works in Minecraft Java 1.19+.
You need 14 kinds of materials (2,885 items, about 53 inventory slots) — see the shopping list.
Blocks on this layer tap a name to find it in the plan
What to do here in the guide's order
One block below the pit, lay a rail loop that snakes back and forth under the whole 7 × 7 area: 40 powered rails and 16 normal rails (see the plan). Under the powered rails, two blocks lower, place 9 redstone torches – they power the blocks the rails stand on, so all powered rails stay on.
Slimes spawn in swamps at any time of day, between Y 51 and 69, where it is dark enough – no slime chunk needed. Pick a flat spot in a swamp (or a mangrove swamp) where the ground is at about Y 63; the room's floor will be at Y 66.
Under the middle of the room, dig a 8 × 7 pit down to Y 59 for the collection system (the plan shows every layer), and a tunnel to its west side for the chests.
One block below the pit, lay a rail loop that snakes back and forth under the whole 7 × 7 area: 40 powered rails and 16 normal rails (see the plan). Under the powered rails, two blocks lower, place 9 redstone torches – they power the blocks the rails stand on, so all powered rails stay on.
Powered Rail×40
Rail×16
Redstone Torch×9On 2 layers: Y 0 (world Y 59), Y +2 (world Y 61)
Where the loop passes the west side, put 6 hoppers under the rails that lead into a double chest (sneak while placing). A hopper minecart that rolls over hoppers empties into them. Two wall torches light the tunnel.
On 3 layers: Y +1 (world Y 60), Y +2 (world Y 61), Y +3 (world Y 62)
Cover the rail loop with a 7 × 7 floor of magma blocks. Magma hurts every slime that lands on it; the hopper minecart below picks up the drops through the blocks.
Magma Block×49On the ground around the 7 × 7 magma floor, build a ring of dirt 2 blocks high, so the shaft reaches up to the floor level (Y 66). In the very middle of the shaft, at floor level, place a single smooth stone block (against a temporary block) – the iron golem will stand on it. Leave the rest of the shaft open.
Dirt1 stack×64
Smooth Stone×1On 3 layers: Y +5 (world Y 64), Y +6 (world Y 65), Y +7 (world Y 66)
Around the shaft, lay a round floor of dirt 37 blocks across at Y 66 and edge it with a ring of dirt path (place dirt and use a shovel on it – see the plan). Slimes spawn on the dirt.
Dirt14 stacks + 44×940Build a wall of smooth stone around the floor, 4 blocks high (from the floor's edge up).
Smooth Stone6 stacks + 32×416On 4 layers: Y +7 (world Y 66), Y +8 (world Y 67), Y +9 (world Y 68), Y +10 (world Y 69)
Put 8 fences 2 high around the pillar in the middle (they stand above the open shaft) and an iron golem on the pillar (4 iron blocks and a carved pumpkin – build it from the floor and push it over, or build it on the pillar). A glow lichen on the pillar under it lights the pen. Slimes attack iron golems: they jump towards it and fall into the shaft.
Place: Iron Golem
Oak Fence×16On 2 layers: Y +8 (world Y 67), Y +9 (world Y 68)
Hang glow lichen under the roof level in the pattern of the plan (place it on the wall top or on temporary blocks before the roof goes on). Its weak light (7) is too bright for zombies, skeletons, spiders and creepers, which need complete darkness – but slimes in swamps can still spawn there.
Cover the whole room with bottom slabs (1,092 – about 17 stacks). Nothing can spawn on bottom slabs, and the roof keeps the room dark.
Smooth Stone Slab17 stacks + 4×1,092Smooth Stone×1Light up the ground under and around the room with torches (the design uses a grid of torches 6 blocks apart), so that slimes and other mobs spawn in the room and not outside.
Torch×48On 2 layers: Y +4 (world Y 63), Y +5 (world Y 64)
From the middle of the roof, build a pillar (scaffolding in the design) about 120 blocks high, with a ring of 8 smooth stone at the top and a slab two blocks above it. You stand on top: the room is within 128 blocks of you, the rest of the swamp mostly is not.
Scaffolding1 stack + 55×119Smooth Stone×8Smooth Stone Slab×1On 120 layers: Y +12 (world Y 71), Y +13 (world Y 72), Y +14 (world Y 73), Y +15 (world Y 74), Y +16 (world Y 75), Y +17 (world Y 76), Y +18 (world Y 77), Y +19 (world Y 78), Y +20 (world Y 79), Y +21 (world Y 80), Y +22 (world Y 81), Y +23 (world Y 82), Y +24 (world Y 83), Y +25 (world Y 84), Y +26 (world Y 85), Y +27 (world Y 86), Y +28 (world Y 87), Y +29 (world Y 88), Y +30 (world Y 89), Y +31 (world Y 90), Y +32 (world Y 91), Y +33 (world Y 92), Y +34 (world Y 93), Y +35 (world Y 94), Y +36 (world Y 95), Y +37 (world Y 96), Y +38 (world Y 97), Y +39 (world Y 98), Y +40 (world Y 99), Y +41 (world Y 100), Y +42 (world Y 101), Y +43 (world Y 102), Y +44 (world Y 103), Y +45 (world Y 104), Y +46 (world Y 105), Y +47 (world Y 106), Y +48 (world Y 107), Y +49 (world Y 108), Y +50 (world Y 109), Y +51 (world Y 110), Y +52 (world Y 111), Y +53 (world Y 112), Y +54 (world Y 113), Y +55 (world Y 114), Y +56 (world Y 115), Y +57 (world Y 116), Y +58 (world Y 117), Y +59 (world Y 118), Y +60 (world Y 119), Y +61 (world Y 120), Y +62 (world Y 121), Y +63 (world Y 122), Y +64 (world Y 123), Y +65 (world Y 124), Y +66 (world Y 125), Y +67 (world Y 126), Y +68 (world Y 127), Y +69 (world Y 128), Y +70 (world Y 129), Y +71 (world Y 130), Y +72 (world Y 131), Y +73 (world Y 132), Y +74 (world Y 133), Y +75 (world Y 134), Y +76 (world Y 135), Y +77 (world Y 136), Y +78 (world Y 137), Y +79 (world Y 138), Y +80 (world Y 139), Y +81 (world Y 140), Y +82 (world Y 141), Y +83 (world Y 142), Y +84 (world Y 143), Y +85 (world Y 144), Y +86 (world Y 145), Y +87 (world Y 146), Y +88 (world Y 147), Y +89 (world Y 148), Y +90 (world Y 149), Y +91 (world Y 150), Y +92 (world Y 151), Y +93 (world Y 152), Y +94 (world Y 153), Y +95 (world Y 154), Y +96 (world Y 155), Y +97 (world Y 156), Y +98 (world Y 157), Y +99 (world Y 158), Y +100 (world Y 159), Y +101 (world Y 160), Y +102 (world Y 161), Y +103 (world Y 162), Y +104 (world Y 163), Y +105 (world Y 164), Y +106 (world Y 165), Y +107 (world Y 166), Y +108 (world Y 167), Y +109 (world Y 168), Y +110 (world Y 169), Y +111 (world Y 170), Y +112 (world Y 171), Y +113 (world Y 172), Y +114 (world Y 173), Y +115 (world Y 174), Y +116 (world Y 175), Y +117 (world Y 176), Y +118 (world Y 177), Y +119 (world Y 178), Y +120 (world Y 179), Y +121 (world Y 180), Y +122 (world Y 181), Y +123 (world Y 182), Y +124 (world Y 183), Y +125 (world Y 184), Y +126 (world Y 185), Y +127 (world Y 186), Y +128 (world Y 187), Y +129 (world Y 188), Y +130 (world Y 189), Y +133 (world Y 192)
Put a hopper minecart on the rail loop and give it a push. The powered rails keep it going round under the magma.
Place: Hopper Minecart
Stand on top of the pillar. Slimes spawn on the dirt floor, see the iron golem and jump towards it. They fall into the shaft and land on the magma blocks, which kill them – big slimes split into smaller ones, which die there too. The small ones drop the slimeballs, the hopper minecart collects them and empties into the chest.
Swamp slimes spawn more often around full moon and hardly at new moon, so the rate changes from night to night.
Your progress is saved in this browser. Log in to keep it on every device and earn 25 points for completing the farm.
Tick what you have gathered — it is remembered together with your build progress. A stack is 64 items (signs 16; buckets, beds and boats do not stack); a shulker box holds 27 stacks.
Smooth Stone Slab17 stacks + 5×1,093Dirt15 stacks + 44×1,004Smooth Stone6 stacks + 42×426Scaffolding1 stack + 55×119Torch×51Magma Block×49Powered Rail×40Oak Fence×16Rail×16Redstone Torch×9
Hopper×6
Chest×2
Minecart with Hopper×1moretingz gives Minecraft Java 1.19 to 26.1+ for this design; Shulkercraft's world was saved in 1.19.2. Swamp slimes spawn only between Y 51 and 69 and only in swamps and mangrove swamps (in Java Edition); the chance follows the moon phase, from full moon (most) to new moon (none), so measure over a whole 8-day moon cycle.
We measured the rate in an empty test world (a swamp with nothing but the farm) over a full moon cycle. In a real swamp, light up the ground and caves around the farm: every dark spot within 128 blocks of you competes for the mob limit.
~2,271 Slimeball/h — Measured on 26.3 (Nov 3, 2026). Measured with our automated test on a local Minecraft server (fake player at the AFK spot); your rate depends on render distance, difficulty and surroundings.
Download the original The schematic / world is offered by the creator or the tutorial author — we link to the original download.
In swamps, slimes spawn on their own between Y 51 and 69 when it is dark enough – no slime chunk needed. This farm is a large round room at that height: a dirt floor, a smooth stone wall and a roof of slabs. Glow lichen under the roof gives just enough light to stop zombies, skeletons, spiders and creepers, but slimes in swamps can still spawn.
In the middle, an iron golem stands on a pillar above a 7 × 7 shaft. Slimes attack iron golems, so they jump towards it and fall down onto magma blocks, which kill them; big slimes split into smaller ones that die there too. A hopper minecart circles on powered rails under the magma, picks up the slimeballs through the blocks and empties into a chest.
Swamp slimes depend on the moon: they spawn most around full moon and hardly at all at new moon, so the farm is faster on some nights than on others.
