Zombie Spawner XP Farm in Minecraft

Use zero-based coordinates. Keep the zombie spawner at (5, 10, 5); clear x=1..9, z=1..9, y=8..12 around it.

💡 Find a real zombie dungeon first: spawners cannot be collected or moved in survival. Keep temporary bright lighting while excavating, then remove it only after sealing the chamber. Never break the spawner.

Build the bottom platform and 3x3 shaft wall rings at x=8..10, z=8..10, y=1..6, leaving the center empty.

💡 At y=0, put south-facing hoppers at (9, 0, 9) and (9, 0, 10), feeding the chest at (9, 0, 11). Leave (9, 1, 10) empty for the later upper slab. The platform is x=7..11, z=8..12; retain the solid wall above the opening.

Build the room floor at x=1..9, z=1..8, y=7. Build the trench floor at x=1..8, z=9, y=6.

💡 Leave (9, 6, 9) and everything above the landing hopper empty: this is the dry drop. The trench is one block lower than the main floor.

Build the perimeter walls at x=0, x=10, z=0 and z=10 from y=7 through y=12, then cover y=13 with a solid 11x11 roof.

💡 Cover the roof with bottom slabs at y=14 to prevent outside spawning. Keep all interior light at zero and do not open a window into the spawn room. The modeled roof and walls can replace excavated terrain.

Place west-facing dry wall signs at (9, 7, 9) and (9, 8, 9), the upper slab at (9, 1, 10), and the bottom slab at (5, 11, 5).

💡 Attach both signs to the west faces of the x=10 wall, without waterlogging them. The attack slab must occupy the upper half of its block: the opening is at most 0.875 blocks tall above the hopper bowl and 0.5 above its rim, below baby zombie heights of 0.975 in Java and 0.95 in Bedrock. This contains babies while allowing sword hits and XP attraction. The other slab caps the spawner.

Place nine water sources at x=1..9, y=8, z=1, and one source at (1, 7, 9).

💡 Reuse two buckets and an outside infinite water supply. The nine north sources carry mobs south off the last wet floor row into the lowered trench, whose west source pushes east toward the signs. The last horizontal stream blocks are z=8 and x=8. Check that water never enters the shaft; remove accidental sources instead of adding water to the drop. Check that transported zombies do not remain submerged long enough to convert into drowned.

Remove temporary lighting and reseal every opening, then wait at the lower attack station.

💡 Use Easy, Normal or Hard, with mob spawning enabled. Observe one wave before letting mobs accumulate; check that babies stay behind the upper slab and that all zombies reach the hopper. The rendered zombie is a naturally generated example, not a mob to obtain.