Star Bits are common collectible items in Super Mario Galaxy and Super Mario Galaxy 2. For every 50 (Super Mario Galaxy) or 100 (Super Mario Galaxy 2) Mario collects, he receives an extra life. Mario will keep collected Star Bits after losing a life in a stage, but he will lose his coins. After completing a mission, Mario's Star Bits are added to his total amount. The stored Star Bits are then used to feed the Hungry Lumas found in the Comet Observatory and several galaxies to unlock galaxies and planets. In Super Mario Galaxy 2, they are also used at various points in the different Worlds and to spin Chance Cubes on Starship Mario. They can also be used to feed other Lumas, without any gain.
Star Bits come in many colors (red, yellow, green, blue, purple, and white), and are quite shiny. They are first introduced in the form of small rocks from space, landing when Mario arrives at Princess Peach's Castle at the beginning of the game. To collect them, the player can move the Star Cursor over them or simply run into them.
When Mario flies through space using a Launch Star and hits a Star Crystal, Star Bits appear around him. To get them, the player must act quickly and touch each of them with the Star Cursor before Mario lands on the next planet.
Pressing the button will shoot a Star Bit at location of the Star Cursor. This can be used to stun or defeat some enemies. If a player holds the button, Star Bits will be shot continuously. Fired Star Bits cannot be recovered.
The average enemy, such as a Goomba, will release three Star Bits when defeated. However, that will only happen if the Star Spin is used, as simply jumping on one produces a single Coin. This holds true for most, but not all enemies. For example, Magikoopas only release Coins no matter what method they are defeated by.
Mario can also make Star Bits appear by Ground Pounding certain buttons or activating Flipswitch Panels in various galaxies. Note that this will not always happen, as each button or Flipswitch Panel performs a different function depending on its galaxy and location.
There is a larger object thought to be somewhat related to Star Bits called the Star Crystal, many of which are normally seen in Launch Star paths. They are broken upon impact and produce at least six Star Bits that Mario must collect quickly before they fly away.
Other game appearances
Mario Kart Wii
Star Bits appear in Rainbow Road, on various parts of the track. They are absent in split-screen mode, most likely to preserve frame-rate.
Mario & Sonic at the Olympic Winter Games
Super Mario 3D World
Super Smash Bros. for Nintendo 3DS / Wii U
Star Bits are used as Rosalina's side special move in Super Smash Bros. for Nintendo 3DS / Wii U, which is called Star Bits. When used, Rosalina commands the Luma to shoot a small number of Star Bits. It is a long-ranged attack that cannot be absorbed or reflected, thus not making it a projectile attack. Nothing will happen if a Luma is not present when Rosalina uses this move.
The move has two variations that can be swapped out once the player unlocks them. Floaty Star Bit is a large Star Bit that is slow and gets in the way of fighters. Shooting Star Bit shoots only one Star Bit, but has longer range and more power. Unlike the default variation, these two variations are considered projectiles, and can be reflected or absorbed.
Mario Party 10
Star Bits make their first appearance in a Mario Party game in Mario Party 10. They appear in amiibo Party in the Rosalina Board. They act like regular Coins, in which they must be collected to get coins.
Names in other languages