Example of stairs : 
The stair is a type of level, except that you had to climb staircases to win. Stairs are normally made of doors, so if someone touches the key (or advance to next level), everyone who is standing on a door will fall or stay in the provided firm block. Normal stairs have one straw, which is advancing to the next clump of stairs. Most stairs will also have a safe point at the end of one flight of stairs.