Star Ball

The Star Ball is a large, translucent, capsule-like ball with a Power Star in it that appears in both Super Mario Galaxy and Super Mario Galaxy 2. The idea with it is to roll to the finish past through the obstacles. The Star Ball will break and will release the Power Star if landed inside the ball-opener.

Appearances
=Super Mario Galaxy=
 * Rolling Gizmo Galaxy
 * Rolling Green Galaxy
 * Melty Molten Galaxy

=Super Mario Galaxy 2=
 * Rolling Masterpiece Galaxy
 * Rolling Coaster Galaxy
 * There is also a Purple Coin Mission in the same galaxy.

Trivia

 * The faster Mario rolls with the Star Ball, the higher the pitch in the background music.
 * The Purple Coin Ball is alike to the regular but there is a Purple Coin inside the ball this time.
 * It's impossible to dismount the Star Ball, unless it lands on the ball-opener or you die.