Binding of Isaac: Rebirth Wiki
Binding of Isaac: Rebirth Wiki

Added in Afterbirth †

D1 is an unlockable activated item added in The Binding of Isaac: Afterbirth †.



  • By dropping a card, rune, or pill in a room with no other pickups, then using D1, this item can function similarly to 15►Blank Card Blank Card, 15►Placebo Placebo, and Added in Repentance15►Clear Rune Clear Rune.
  • Rune of Jera Rune of Jera can not be duplicated.
  • Mimic Chests will not be duplicated.
  • A normal Chest may be duplicated into a Red Chest or a Mimic Chest.
  • Opened chests will be duplicated into an unopened copy.
  • Removed in Repentance A duplicated trinket is mostly useless, as you cannot pick up two of the same trinket even with 15►Mom's Purse Mom's Purse, 15►Belly Button Belly Button, or 15►Smelter Smelter.
  • It is possible to duplicate shop pickups that have not been purchased yet.
  • With 15►Car Battery Car Battery, it is possible to infinitely generate Lil' Batteries from a single Lil' Battery.
  • In combination with a 48 Hour Energy and Paper Clip Paper Clip, the initial Locked Chests on Chest Chest can be infinitely duplicated and opened.
  • In Greed mode, if a Lil' Battery appears in the Shop and a 2 of Diamonds 2 of Diamonds is acquired, infinite money can be gained by duplicating the Two of Diamonds.
  • Added in RepentanceWith a ? Card ? Card and 15►Schoolbag Schoolbag, single use items can be used an unlimited number of times by duplicating the card.

In-game Footage[]


  • D1 is the only dice item that doesn't re-roll anything.
    • As such, its description, in certain cases, can be ironic, as the outcome is entirely predictable if there's only one pickup. This makes sense because the dice only has one pip on each of its 6 sides.
    • As an exception, Added in Repentance15►Spindown Dice Spindown Dice, although it technically does re-roll items, has a controlled and consistent result.
  • D1 is the only standard dice item that doesn't have the respective number of sides as outcomes, but rather, just a D6 with all sides having singular pips. Rather, an actual D1 would be more accurately pictured as a Mobius strip or a sphere.


PC Normal and hard modes only 34HF 9E4F (Treasure Room adjacent to spawn)

The Binding of Isaac: Rebirth The Binding of Isaac: Rebirth The Binding of Isaac: Rebirth
Achievements Achievements Attributes Attributes Bosses Bosses TarotCard.png Cards and Runes Challenges Challenges Chapters Chapters
Characters Characters MainPageBabies.png Co-op Items Items Item pools Item pools Monsters Monsters Objects Objects
Pickups Pickups Pills Pills Rooms Rooms Seeds Seeds Transformations Transformations Trinkets Trinkets