Leave the top block empty.
How to make a piston floor.
Fill in the 1x3 floor with redstone and the 2 blocks from the middle that are on the bottom fill with redstone as well.
Put a redstone torchpowering each piston and connect them both as inverters.
20 x redstone dust 12 x sticky pistons 8 x repeaters 2 x redstone torches 2 x pressure plates music.
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Still works as of 1 15 tested.
Simplest 1 2 piston door edit uses 2 pistonsto pull out the top and bottom of the door.
Http awe sm q0dqx here is the floor trap i.
Seems some people don t know how to do a floor of extendable pistons so i decided to show how to do it.
From a completely flat surface to a deep tunnel in the ground wi.
Coldplay made.
Put a leveron one block with wire on it build a wall on the front and it s done.
In the most compact way let me know if you want t.
At the block at the end of the piston place a redstone torch standing up.