The Quarry - The Loop


Missing No. is an unlockable passive item.



  • See Collectible D4 icon.png D4 for more details of the rerolling process.
  • Like other full-reroll effects, Missing No. has a small chance to not reroll every item.
  • Dlc nr indicator.png Can cause transformations.
    • Dlc r indicator.png Transformations are lost when rerolling out of the items that caused them.
  • Missing No. cannot be re-rolled or removed by most means after being picked up, including Collectible D4 icon.png D4, Dlc a† indicator.png Collectible Clicker icon.png Clicker, Dlc r indicator.png Pickup XVII - The Stars? icon.png XVII - The Stars?, or taking damage as Character Tainted Eden icon.png Tainted Eden.


In-game footage


  • There is no real strategy to Missing No. as it randomizes all the player's items. The benefit of the randomization can be added by collecting more items to increase the chance of a good item synergy.
  • However, this item can be used to gain more health if desperately needed, as the randomization does often include items that grant you various types of hearts.
  • If the player has already obtained a large number of items (such as during a run where they have gained infinite money in greed mode), it is highly recommended to avoid this item, as it will almost always end up rerolling all the items the player has thus far collected into Collectible Breakfast icon.png Breakfast.
  • Due to losing all items every level, it is beneficial to try to gain permanent stat boosts if possible. These include using pills when equipped with Collectible PHD icon.png PHD or Collectible Virgo icon.png Virgo, sacrificing health with Dlc a† indicator.png Collectible Potato Peeler icon.png Potato Peeler to gain damage or Dlc a† indicator.png Collectible Brittle Bones icon.png Brittle Bones to gain tears, or using up Collectible Judas' Shadow icon.png Judas' Shadow.


  • This item is a reference to the infamous Missing No. glitch occurring in the first Pokémon games. The glitch would often corrupt save files, and therefore randomize various parts of the game as it would use the incomplete index values attributed to entities not included in the final release of the game. Isaac's appearance when affected by Missing No. is based on this glitch which could cause the player's sprite to become scrambled.
  • The item also resembles the painting "Composition II with Red, Blue, and Yellow" by Dutch painter Piet Mondrian.
  • The background color for the Missing No. achievement has the same color as all the challenge unlocks. This implies that Missing No. was originally intended to be unlocked via a challenge. (Or, perhaps, it was intended to be looked at as an error.)


PS4 PC FTTQ E3RZ (Secret Room directly to the right of the starting room)

PS4 X1F3 19X9 (First floor Secret Room to the left of the Shop)

PC 2QDT ALD2 (First floor Secret Room to the bottom of the Treasure Room)

PC W4Q7 JMMP (First floor Secret Room directly under the Treasure Room)


Collectible Undefined icon.png Bug! Using Dlc a indicator.png Collectible Glowing Hour Glass icon.png Glowing Hour Glass to go back to the previous floor will keep the rerolled items, which will allow to reroll them again.
Collectible Undefined icon.png Bug! Dlc r indicator.png Rerolling into Collectible PHD icon.png PHD as Character Jacob and Esau icon.png Jacob and Esau will not reveal newly acquired pills, even if using the character that took Missing No.
Collectible Undefined icon.png Bug! Dlc r indicator.png Rerolling into Collectible PHD icon.png PHD from it will not reveal newly acquired pills.
Collectible Undefined icon.png Bug! Collectible The Polaroid icon.png The Polaroid shield might not activate after the reroll

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