Stairs are blocks that can be walked up without the need to jump and are an alternative to steps. Stair blocks are directional and more compact than step blocks, allowing a greater elevation change per distance. Stairs can be made from six wood or cobblestone but will only yield one upon destroying the block after placement.
They are only available in the alpha version. If a save file containing stairs built with the alpha version is loaded into infdev, the game will crash.