Silver Moon Ring
From Sonic Retro
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When the player has collected all five Red Star Rings in a level, then all of the Number Rings in another playthrough of the level, they will be able to collect Silver Moon Rings in subsequent playthroughs of that level.
Similar to Number Rings, all of the Silver Moon Rings are found in a particular section of a level. They can be collected in any order, but once the first one is collected, the remaining Rings are placed on a timer and must all be collected before the timer expires. If the player runs out of time before collecting all of the Rings in the set, they must restart the stage from a point before collecting them if they wish to try again.