Minecraft wiki entry for Mechanisms, associated text: This is fairly easy to make. Below the floorboard's blocks, you put a face-up sticky piston that is powered when off, done by a redstone torch, and then the next block in the floor has a double-piston extender, also powered when off, and then a triple piston extender, and so on, so when the sticky pistons are powered off, then the blocks will be pulled down into a staircase.