Medallions are used in the Treasure Shrine (Jackpot) for a chance at rewards.
How to use them
Open the Free Coins section.
Tap Play under the Jackpot area.
Your Medallion count shows on the right side of the screen.
Tap Drop to use one Medallion for one play.
If you don’t have Medallions
You can buy one for 2,500 Coins directly from the same screen.
The Treasure Shrine is the only place to spend Medallions, so try your luck there for extra rewards.