- "Keep the animals out."
A wooden door is an item created at a Woodwork Bench.
When placed, a door fills the space of two vertically-stacked blocks and takes on characteristics of the local back wall, the block above it, the block below it, or just wood. When placed on top of open dirt, it may act as wood instead of dirt.
Viewed in detail, a placed door appears to be composed of two side-facing doors, a gap between them, and block-like surfaces in front and behind.
Any Blockhead passing through a door's location will automatically open and close it, although special circumstances may make it appear that the door is left open. The door will always be opened away from the Blockhead opening it, and a door with a solid block on the other side cannot be opened.
A door can make a convenient "fence" to keep animals from passing without significantly slowing down a Blockhead.
In version 1.3, a new type of door, the Iron Door, was added. It prevents Blockheads not owned by the player whose Blockheads placed the door from going through.