Door

Doors are blocks that are only obtainable through crafting. Upon clicking a wooden door with either the left or right mouse button the block will shift from its native closed state to an open state allowing passage; clicking the door once more will return it to being a closed door. If two doors are placed adjacent to each other, they will orient with their handles inward, creating a double door. It is possable to make a double door with pressure plates like so

Destroying the block beneath a door will break it. Swords are also effective against wooden doors, though the sword will still take double damage.

Iron Doors
An Iron Door acts the same as a wooden door with the exception of only being able to be toggled by a switching mechanism such as a Lever or a Stone Button. If an iron door has both an on and off signal connected at once, the off signal takes precedence. This creates the possibility to make doors that are only controllable from remote locations using a switch and Redstone.

Iron doors can take quite a bit of time to destroy even with a pickaxe. To destroy them even more quickly, simply break the block beneath the door.

Glitches
Because the door occupies the edge of a tile, if you stand in the center of the tile you can hit things on the other side. Make sure you place the door from the outside of your house so that you can attack monsters on the other side, but they cannot attack you. As long as you follow this rule and make sure the door is on the edge that will be exposed to danger, monsters cannot harm you from the outside, but you can fight them without opening the door.

Minecarts and boats will not move through doors. Water will not pass through either, useful for flood control. Another practical use of the door's water glitch is to leave a door open as an entrance to something underwater that is water-free on the other side.

Doors placed on doors will be lost, and nothing will happen.

Be careful when opening doors with right click while holding a filled bucket. Doing so will empty the contents of the bucket at that location.

There is also a glitch involving double doors and switches that causes right-hand doors to react inversely to switches. In other words, a right-hand door with a Pressure Plate pressed will stay closed, and when released, the door will open. A left-hand door will open when powered and close when released.

You can walk on top of doors. An easy way to make a drawbridge is to use two doors, two switches, and at least a 2 by 2 by 2 deep pit. Have the two doors on opposite sides at the bottom of the pit so that when opened the doors create a small line in the middle. Put the switches on the same sides of the door so that when pushed both doors will open and you should have just enough time to get across. There is another major glitch that can only be made by using a map editor. If the lower half of a door is copied, it is possible to get a 1 block high door.

It is also impossible to place doors on a ice block.

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