When Were Trapdoors Added to Minecraft?

Trapdoors have been in Minecraft since Beta 1.6 in 2011, when they were added alongside maps, grass and dead bushes. Originally they only opened upward, but that was later fixed so they opened down too, and the ability to climb them as a ladder was added.

When were birch doors added to Minecraft?

Birch Planks are a type of Block added in Update 0.8.

Does lava burn trapdoors?

Lava can create fire in air blocks next to wooden trapdoors as if they were flammable, but the trapdoors will not burn up (and can't be burned by other methods either). An open trapdoor may be climbed like a ladder if it is directly above a ladder and on the same side of the block.