*Stairs are tile collision events that can interact with sprites. I think the sprite. The game is programed that Simon's Sprite x Coordinate coordinate can look onto the diagonal of the stair tile. But every 8 pixel you can fall through if you jump toward the tile cross pointstairs. Tiles are square of 8*8 pixels. You can see the gap on this example very good. It will also give you a idea on what pixels you have to watch out for. The jump close to the stair is a duck-jump since otherwise Simon will automatically hock to them. You only hock automatically to stairs when they are on a edge so you can not simply walk off. It will replace the frames where Simon has the legs close together when standing on a ledge.  [[File:StairBoss.gif]]