Studs are the main currency used in LEGO Dimensions. They function as collectible currency.
Types and value
When the player is in the Sonic the HedgehogWorld, the level from the 71244 Level Pack or have the Ring-a-Ding-Ding Extra enabled, studs will be replaced by rings. This is mostly due to rings being a main currency in Sonic the Hedgehog.
The ring chime is also heard when a ring is collected.