Door

Doors are blocks that are only obtainable through crafting. Upon clicking the object 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.

- Doors can take quite a bit of time to destroy. To destroy them more quickly, simply destroy the block beneath the door.

Glitches
Possibly due to a glitch in detection, monsters may attack through doors; creepers will detonate, zombies are able to reach through them and skeletons can shoot arrows through them.

Minecarts will not move through doors. Water won't either, leading to an excellent way to keep multiple rooms from flooding. 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 may be placed on doors, but it will be lost, and nothing will happen.

Destroying the top half of a door will return nothing, the lower half must be destroyed to get the door back.

There was also a duplication glitch that occurs when a door is placed onto a half step/leaf block/glass block, causing two door drops to spawn where the first door was set down. This was fixed shortly after the update containing doors was released.