The Spring Ball is another crucial Morph Ball upgrade, allowing Samus to jump while in Morph Ball form. This significantly enhances your mobility and opens up even more hidden areas.
Location: The Spring Ball is often found in a chamber requiring precise Spider Ball maneuvers or a hidden passage revealed after defeating a certain number of Alpha Metroids. Look for areas with small ledges that are just out of reach for a normal Morph Ball jump. Once acquired, select the Morph Ball, then press A to jump. This allows for much greater vertical exploration.