Arcade Rock is a trinket in Fiend Folio, a mod for The Binding of Isaac.

Machines have a chance to refund money spent on use.

The chance for a refund starts at 25% with 0 luck, and is increased by 2.5% for each point of luck.

Only the following machines can refund money:
• Slot Machine
• Fortune Telling Machine
• Donation Machine
• Shop Restock Machine
• Greed Donation Machine
• Crane Game
• Mining Machine
• Robot Teller

The following special synergies and interactions for Arcade Rock have been documented.

* Note that not all possible synergies and interactions are listed here.

• Check out the trinket description on the mod's external Wiki.
• Download Fiend Folio from the Steam Workshop.