Dungeon/Castle Tile, 3" x 3", Trap Door, 4 Blocks

As you enter the room, you see a large trap door in the floor.  There does not appear to be any sort of lock on it.  The wood doesn't appear to be dusty from lack of use, either.

4 block wooden trap door, dual-sided tile, plain on the other side.  Random textures, cracks, and colours.