Unlimited Double Coins becomes active immediately after the purchase has been made – doing so will cause each Coin during a run to be doubled.
This is a one-time purchase and will be active for all runs thereafter!
You can purchase Unlimited Double Coins by going to the Shop and tapping the 'Store' tab. Scroll down to the Coins section and you will see Unlimited Double Coins available for purchase — for $4.99 USD or your countries currency equivalent.
