Silver Star

Silver Stars are collectibles in Super Mario 64 DS, taking the appearance of gray Power Stars. They can be found being held by enemies, hiding inside boxes or trees, or jumping around the level. Collecting 5 of them will make a Power Star appear. However, if the player is damaged, they will drop a Silver Star that will have to be recollected.

Super Mario 64 Manifestation
Silver Stars have been reported to appear in personalized copies of Super Mario 64. They usually function similarly to red coins, and are commonly a reskin of the spinning beta star, though have been reported to be reskins of regular stars. They usually can be found lying around the map similarly to red coins, and reportedly only drop upon taking damage in a small amount of personalized copies. This is likely due to the Personalization A.I. being unable to fully recreate the Silver Stars.