Bolt (Super Mario Galaxy)

Blue screws are spinnable objects in Super Mario Galaxy. They are embedded into the terrain of industrialized galaxies, such as the Battlerock Galaxy and Buoy Base Galaxy. Performing a spin while on top of a blue screw embeds it into the ground and triggers a nearby event. In Buoy Base Galaxy, a yellow screw appears in the top of a Ball Beamer that disengages it when spun. Blue screws are very similar to valves.