Flat Penny is a trinket in The Binding of Isaac.

Grants a chance to drop a key when collecting coins.

The chance is based on the coin's worth:
• Penny: 25% chance.
• Double Penny: 43.75% chance.
• Nickel: 76.27% chance.
• Dime: 94.37% chance.

Keys can be of any type.

Can be dropped from Special Shopkeepers.

This page shows information as of the latest Repentance release.
To see latest up-to date information about this trinket for the new Repentance+ (Online Co-op) DLC, check this page instead.

Flat Penny can be found in the following item pools:

The following special synergies and interactions for Flat Penny have been documented.

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

• Check out the trinket description on the external Isaac Wiki.