? Card

Special Cards

Rebirth	Suicide King	Chaos Card	Credit Card	Rules Card	A Card Against Humanity
Afterbirth	? Card	Get out of Jail Free Card	Emergency Contact	Dice Shard
Afterbirth †	Holy Card	Huge Growth	Ancient Recall	Era Walk

"Double active"
Entity ID	5.300.48
Type	Special card
Item Pool	None

? Card is a special card added in The Binding of Isaac: Afterbirth.

Effect

• Replicates the effect of Isaac's activated collectible.
  • Single-use items, such as Pandora's Box, will not replicate but instead activate and disappear.
  • Single-use items do not disappear after using ? Card, allowing for potential multiple uses of the items.

Notes

• The ID of this card was 43 before the Afterbirth+ expansion.
• Doesn't work with activated items in a consumable slot (such as Tainted Bethany's Lemegeton or items given by Dice Bag).

Interactions

• Car Battery: Does not influence the card's effect, activating the active item only once.
• Jar of Flies: Expends both the card and all charges with no additional benefit.

Synergies

• Alabaster Box: Causes the Alabaster Box to yield rewards without destroying the item or depleting any of it's current charges.
• Blank Card: Teleports Isaac to the I AM ERROR] room of the current floor. This will consume both the Blank Card and the ? Card. If done on Chest or Dark Room, will instead spawn an I AM ERROR shopkeeper.
• D1 + Schoolbag: ? card can be duplicated with the D1, allowing for single use items to be repeatedly used on effectively a 4 room charge.
• Diplopia: Duplicates all pedestal items and pickups in the room, without expending Diplopia.
  • If used with another ? Card dropped on the floor in the room, allows for infinite duplication.
• Glowing Hour Glass: Since the card replicates the effect of moving back one room to the previous state, Isaac keeps the card having not used it as an item until the room later. This effectively gives him charge-free uses of the Glowing Hour Glass.
  • The card is no longer refunded.
• Tarot Cloth: ? Card is used twice, giving the active item the same effect as if Isaac had Car Battery.

Trivia

• The interaction with Blank Card presents a paradox, as Blank Card and ? Card try to replicate the effects of each other. This would result in an endless loop, so a special case was put in.
• The Blank Card interaction is one of the four reliable ways to reach the I AM ERROR room in game, alongside Teleport 2.0 in certain circumstances, using Red Key to go beyond the 13x13 level grid, and Undefined.
• Before Booster Pack #5, Glowing Hour Glass was limited to 5 uses, and uses of the ? Card counted against that limit.

The Binding of Isaac: Rebirth
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