37 blocks in a 7×8×1 space

Flip the lever: the sculk sensor hears its click and the 3×3 doorway opens; flip it back and it closes. It opens in 46 ticks (2.3 s) and closes in 14 ticks (0.7 s).

Uses a sculk sensor: footsteps or other noises nearby can open or close it. Keep walkways away from it, or shield it with wool.

most compact sculk doorseamless: machine hidden from both sides, closed and openno slime1 block thick

7×8×13×3 sculk door3D view loading (or not available in this browser)

Every record 10

The best door for each thing builders ask for: pick one to see it.

best at	size	speed
Most compact fully seamless door Most compact fully seamless 1-block-thick door with no slime	41 blocks in a 7×8×1 space	opens in 36 ticks (1.8 s), closes in 19 ticks (0.95 s)
Most compact gravity door (its doorway blocks are sand or gravel)	33 blocks in a 7×9×2 space	opens in 5 ticks (0.25 s), closes in 16 ticks (0.8 s)
Most compact sculk door (this page)	37 blocks in a 7×8×1 space	opens in 46 ticks (2.3 s), closes in 14 ticks (0.7 s)
Most compact stone door Most compact door with no slime Most compact 1-block-thick door Most compact door in a 3-thick wall	38 blocks in a 7×8×1 space	opens in 36 ticks (1.8 s), closes in 19 ticks (0.95 s)
Most compact door that uses entities (a minecart or the like) as moving parts	38 blocks in a 7×9×4 space	opens in 36 ticks (1.8 s), closes in 32 ticks (1.6 s)
Fastest door to open and close: a gravity door (sand or gravel door blocks)	48 blocks in a 7×10×4 space	opens in 5 ticks (0.25 s), closes in 11 ticks (0.55 s)
Fastest door to close Fastest stone door to close	90 blocks in a 9×9×5 space	opens in 12 ticks (0.6 s), closes in 7 ticks (0.35 s)
Most compact door that stands on flat ground (no digging below it)	98 blocks in a 9×5×5 space	opens in 54 ticks (2.7 s), closes in 54 ticks (2.7 s)
Fastest stone door to open and close	107 blocks in a 9×10×8 space	opens in 9 ticks (0.45 s), closes in 7 ticks (0.35 s)
Fastest door to open Fastest stone door to open	218 blocks in a 9×11×14 space	opens in 4 ticks (0.2 s), closes in 15 ticks (0.75 s)

Try it

Press play under the view: the door opens, stays open a moment and closes, again and again, like our record video. To take over, tap the lever or the Flip button under the view: once to open the door, again to close it.

Build it

Download .litematic Download the design as text

The .litematic opens in Litematica (Minecraft 26.3): every block of the design in one region. Verified in the real game. The text file is the same build written as plain text, block by block.

Blocks used: calibrated sculk sensor lever observer piston redstone lamp redstone wire sticky piston stone

Details: how it works in depth, our test in the real game, measurements and properties

Properties

Size (community volume)	56b (7x8x1)
Blocks placed	37
Category	sculk
Open / close	46 / 14 gt (2.3 s / 0.7 s), worst of 3 cycles after the lever flip
Rotations	safe
No slime or honey	yes
Flat (one block thick)	yes
Seamless	seamless: machine hidden from both sides, closed and open
Frame when open	12/12
Hallway-compatible	no
Record-eligible (community regulation)	no
Boards	Sculk
Best door for	most compact sculk door
Found by	agent track c77
Archived	2026-10-19 20:23Z
Filled from	e78st-56b-38-1s.txt (`door fill`: the same mechanism, other blocks in its free cells)
Flags	rotation-safe, no slime or honey, flat (one block thick), fits a 3-thick wall, seamless (any tier), seamless FULL or better, full frame when open, the best door for something (the most compact or the fastest of its kind), size
Design file	`e78st-56b-38-1s-fill-37b-1-37b`

Every check of the community regulation

Nothing left in the doorway	no (opening: door block 4 moves back)
Dents in the wall	none
Frame blocks in place when open	12 of 12
Lever on its own support block	no
Lever on the wall's surface	yes
Blocks that can be set off by accident	calibrated sculk sensor
Seamless	seamless: machine hidden from both sides, closed and open
Seamless even while moving	no

The design file

on GitHub

Design file (42 lines)

# verified WORKS by door leaderboard: 37 blocks, category sculk
# archived 2026-10-19 20:23Z from origin/explore/c77:designs/piston-door-3x3/tracks/c77/runs/e78st38-keep3/e78st-56b-38-1s-fill-37b-1.txt (repo at 7c5e37c16)
name: e78st-56b-38-1s-fill-37b-1
note: door fill of designs/piston-door-3x3/tracks/c77/e78st-56b-38-1s.txt: (0,-3) calibrated_sculk_sensor[facing=west,power=0,sculk_sensor_phase=inactive,waterlogged=false] (-2,-1) air
port door: 0 0 0
port lever: 1 5 0
origin: -2 0 0
palette:
  A minecraft:observer[facing=up,powered=false]
  B minecraft:observer[facing=west,powered=false]
  C minecraft:calibrated_sculk_sensor[facing=north,power=0,sculk_sensor_phase=inactive,waterlogged=false]
  D minecraft:sticky_piston[extended=false,facing=west]
  E minecraft:sticky_piston[extended=true,facing=down]
  F minecraft:stone
  L minecraft:lever[face=floor,facing=east,powered=true]
  O minecraft:observer[facing=down,powered=false]
  P minecraft:piston[extended=false,facing=up]
  R minecraft:redstone_lamp[lit=false]
  S minecraft:sticky_piston[extended=false,facing=east]
  c minecraft:calibrated_sculk_sensor[facing=west,power=0,sculk_sensor_phase=inactive,waterlogged=false]
  o minecraft:observer[facing=east,powered=false]
  p minecraft:piston_head[facing=down,short=false,type=sticky]
  r minecraft:redstone_wire[east=side,north=none,power=0,south=none,west=side]
  s minecraft:sticky_piston[extended=false,facing=up]
layer -3:
  .PcsCR
layer -2:
  ..BsOO
layer -1:
  .AF..D
layer 0:
  S.FFF.D
layer 1:
  S.FFF.D
layer 2:
  FFFFFFF
layer 3:
  ropppBr
layer 4:
  ..EEE
layer 5:
  ...L