This is a tutorial on how to make a working piston hallway in Minecraft.
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Step 1: Pistons
Add a row of 8 columns of sticky pistons, each with one space in-between them. Do the same for the other side, four blocks away.
Step 2: Power
Add 3 blocks of wool in an 'L' formation behind the pistons, then put a redstone torch on top.
Step 3: Wiring
Add a repeater to the start of the line of wool, just behind, then wire up with redstone, going up onto the wool, with every hollow block having a repeater.
Step 4: Walls
Add a custom block in front of each piston, while filling in the gaps with any block.
Step 5: Lever
Connect the wires to a lever, and pull the lever to activate the door.
Step 6: Done!
You have completed your piston hallway.