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Ok It might not be the most useful thing in the world, but it can come in handy especially in custom maps. Lets say in your (adventure, map, etc) map you have a room which you don't want the player to get into. Such as a room that has the supposed key for the players escape. Normally you would just put down an iron door in which the player then couldn't reach the treasure. However lets say during that map you also have to give the player a switch for him to progress but you don't want him going back to find out the room that he thought was his destination is actually just a phony cosmetic room.

How to lock an Iron door

1. Find where you wish to put your single door and then dig out a space to the left for another door to go beside it.

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2. Next place two doors down and attach a redstone torch. Remove the torch and you will see that the right door (the one you want to use) stays open without power.

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3. Remove the junk door and repair your room.

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4. Now dig under a block of your door and place a torch to provide power, which in turn closes the door.

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5. Cover it up and now your door cannot be open with any switch, button, plate or redstone torch

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hope this helps Please THANK topic

by sharpz498