Missing No.

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Missing   No.
Item icon
Item altar
"Syntax error"
Table dividing line 1.png
Item ID
Character Appearance
Character appearance
Table dividing line 2.png
Table dividing line 3.png
Collection Grid
Removed in Afterbirth(page 3, column 4, row 6)
Added in Afterbirth(page 3, column 14, row 1)
Unlock Method
Missing No. Complete the Boss Rush as Lazarus Lazarus

Missing No. is an unlockable passive item.

Effects[edit | edit source]

Notes[edit | edit source]

  • See 15►D4 D4 for more details of the rerolling process.
  • Like other full-reroll effects, Missing No. has a small chance to not reroll every item.

Synergies[edit | edit source]

  • Added in Afterbirth †Butter! Butter!: Provides the only available method for getting rid of Missing No.

In-game footage[edit | edit source]

Strategy[edit | edit source]

  • 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 15►Breakfast 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 15►PHD PHD or 15►Virgo Virgo, sacrificing health with Added in Afterbirth †15►Potato Peeler Potato Peeler to gain damage or Added in Afterbirth †15►Brittle Bones Brittle Bones to gain tears, or using up 15►Judas' Shadow Judas' Shadow.

Trivia[edit | edit source]

  • 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, Yellow, and Blue" 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.)
    • The background color for the Suicide King achievement has the same color as all the boss rush unlocks. This implies that potentially Lazarus would have unlocked Suicide King for completing the Boss Rush and the Suicide King challenge would have unlocked Missing No.

Seeds[edit | edit source]

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)

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