Trapdoor

A Trapdoor is an accessible block that can be placed on a vertical surface. It can be placed on bottom and top side of a block.

Crafting

 * 6 Wooden Planks => 2 Trapdoors
 * 4 Iron Ingots => 2 Iron Trapdoor

Uses

 * Trapdoors can be used in automatic mob farms and mob traps.
 * This is because mobs consider open trapdoors as a solid block, and they will walk through them, causing them to fall in pits beneath the trapdoor.
 * Trapdoors can be used to make secret compartments, or just for decoration.

Trivia

 * If the player destroys a block next to an open trapdoor, It will close as soon as the block is destroyed.
 * This also includes to doors. If a door is place beside a trapdoor, it will close when the player opens the door. It is unsure whether this will be fixed in future updates.
 * The player can walk on the side of an open trapdoor.
 * Iron trapdoors were added in Update 0.13.0.
 * They are harder than Wooden Trapdoors.
 * They can only be opened by a Redstone Signal.