Anyway, first, let's add something to the level. How about a block to jump over? What you do is, inside Sector 1, enter Linedefs mode, and right-click. Move the mouse to the left until the line hits one of the one sided linedefs, then right click. Move it up 64 units, right click, move it to the right to the other line, right click, move down 64 units, right click, and move to the left until you hit your starting point. Now, the ever helpful Sector dialog will pop up. Set the floor height to 50, and the floor flat to FLOOR0_3.