If you want to bring some variation in your level or are tired of straight slopes/stairs, use a spiral staircase to connect two floors. (For more information about stairs check this tutorial out) Here is how it works: Click on the block tool, select "arch" in the drop-dwon menu on the right (red arrow) Create your brush and press "enter". A window will pop up, in which you enter the following values. (You can use another value for "Wall Width", it determines the width of each step.) If you have entered every value as you want it, click OK and your staircase is done. You can adjust the width and height, so it suits your map.