Coins are the basic form of currency in The Binding of Isaac and its Rebirth remake. They can be gathered in the form of Pennies, Nickels, Dimes (Wrath of the Lamb only), the Quarter or the all-coveted Dollar. You can hold a maximum of 99 cents at any time (Binding of Issac). Any additional coins collected beyond this point will do nothing. Coins can be used to purchase items from the Shop. Beyond that, coins can also be used in gambling at the Arcade with Slot Machines or with Shell Games. Additionally, coins can be donated to Beggars for pickups and a free item. Coins can also be used with the Portable Slot item. Lastly, coins can be used to gain a damage boost from the Money Equals Power passive item.
The most common coin in the game. These add 1 cent to your total and can be found almost anywhere such as from Champion Enemies, Poop, Fireplaces,Greed/Super Greed, from completing a room, as a reward from a Slot Machine/Shell Game, in Secret Rooms, from the I AM ERROR Room, from Blood Donation Machines and from the Sack Of Pennies.
Nickels may sometimes replace Pennies with a 1/20 chance. These add 5 cents to your total.
The version on the right replaces the nickel in Wrath of the Lamb.
Dimes are the rarest normal coin in the game and can randomly replace Pennies or Nickels with a 1/100 chance. These add 10 cents to the character's total. Added in the Wrath of the Lamb DLC.
1+1 Free Pennies
Added in Rebirth. They worth 2 pennies.
Added to the Afterbirth DLC for Rebirth. They stick to the ground when the character tries to collect them. They need to use an explosion to blast them off the floor to collect them.
"Cain's Eyepatch" - Hold 55 Coins at once in a single playthrough.
"The Burnt Penny" - Complete Challenge 3.
"The Counterfeit Coin" - Complete Challenge 9.
"The Bloody Penny" - Complete the Cathedral with Samson.
"Sticky Nickels" - Complete the Throwback Boss Rush Room with Keeper (character).