Binding of Isaac: Rebirth Wiki
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{{infobox activated collectible
<onlyinclude>{{ItemTable | temp={{{1}}} | disp={{{2}}}
 
 
| name = Undefined
 
| name = Undefined
| type = Active
 
 
| id = 324
 
| id = 324
 
| quote = Undefined
 
| quote = Undefined
| description = Teleports Isaac to either the [[Secret Room]], [[Super Secret Room]], [[Treasure Room]], or [[I AM ERROR]].
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| description = Teleports Isaac to the [[Secret Room]], [[Super Secret Room]], [[Treasure Room]], or [[I AM ERROR]].
| grid = Afterbirth
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| quality = 2
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| tags = offensive
{{CollectionGrid|3|19|4}}
 
Rebirth
 
{{CollectionGridOld|4|9|2}}
 
 
| recharge = 6
 
| recharge = 6
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| unlocked by = Undefined
| pool = {{Treasure Room}}
 
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}}
| unlockedby = Beat the [[Boss Rush]] with [[Eden]]
 
}}</onlyinclude>
 
   
'''Undefined''' is an unlockable activated [[item]].
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'''Undefined''' is an unlockable [[Items#Activated%20Collectibles|activated item]].
   
 
==Effects==
 
==Effects==
* Upon use, teleports Isaac to the [[Treasure Room]], the [[Secret Room]], the [[Super Secret Room]], [[I AM ERROR]] or [[Black Market]] (very low chance).
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* Teleports Isaac to the [[Treasure Room]], the [[Secret Room]], the [[Super Secret Room]] or [[I AM ERROR]]. There is also a minuscule chance of teleporting into a [[Black Market]].
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** The chances for each main destination are equal.
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** {{dlc|r}} Has no effect when used in {{Stage|home}}.
   
==Ingame Footage==
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==Strategies==
 
* The [[I AM ERROR]] room in {{Stage|Cathedral}} and {{Stage|sheol}} will have a beam of light/trap door leading to the next floor, even if Isaac doesn't have {{i|The Polaroid}} or {{i|The Negative}}.
 
* {{dlc|na}} {{Stage|Chest}} and {{Stage|dark room}} are reset on exiting the I AM ERROR room, which can be done repeatedly as long as the player can gather enough charges to successfully warp to it. This can provide a ridiculous number of items from the golden chests in {{Stage|Chest}}.
 
** This makes it possible to kill [[??? (Boss)|???]] or [[The Lamb|Lamb]] multiple times. If Isaac has an item that resurrects him as a different [[Characters|character]], multiple [[achievements]] and items can be unlocked in a single run.
 
**{{dlc|a+}} {{Stage|the void}} is also reset and can be cleared repeatedly.
  +
* {{dlc|r}} As no Secret Rooms or Super Secret Rooms spawn on any floor during the [[Ascent]], this item will only warp Isaac to either the Treasure Room or the I AM ERROR room. This can be a reliable method of gaining many items on the way up to {{Stage|home}}, while also allowing the player to skip potentially difficult encounters.
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==In-game Footage==
 
{{#ev:youtube|v-u7J2_SXBI}}
 
{{#ev:youtube|v-u7J2_SXBI}}
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==Trivia==
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* The item is a reference to a bug in the original ''The Binding of Isaac'', where exhausting an [[Item Pool]] (or rarely simply by chance) would cause an item to spawn whose name and description was listed as "Undefined", and whose sprite would rapidly cycle through the sprites of every other item in the game. Undefined by itself creates no effect, but if it was ever picked up, should the game attempt to spawn an item from an exhausted item pool, the game instead crashed, as it could no longer spawn Undefined. From ''Rebirth'' onwards, an exhausted item pool will instead spawn {{I|breakfast}}, even if the item would normally never spawn from that item pool and/or Breakfast had already been obtained in the run.
 
* In programming "Undefined" refers to an unknown value.
 
* Given the Glitch theme of the item and the ability to access [[Chapters]] that have not yet been unlocked using [[I AM ERROR]], along with the ability to acquire mass upgrades in The Chest and The Dark Room, it is possible that it was intentionally made into a powerful sequence-breaking item.
 
* The sprite for Undefined appears to be, fittingly, a glitched and spliced version of other item sprites, with the bottom right part noticeably being the {{I|the compass}}, the bottom left being the {{I|blood bag}}, and the top half being {{I|contract from below}}. This may also be a reference to Undefined's sprite in the original ''The Binding of Isaac''.
   
 
==Gallery==
 
==Gallery==
 
<gallery>
 
<gallery>
3DS_Detailed_Undefined.png|{{Plat3DS}} The icon of Undefined as seen on the lower 3DS screen
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File:3DS Detailed Undefined.png|{{plat|3DS}} The icon of Undefined as seen on the lower 3DS screen
 
</gallery>
 
</gallery>
 
 
 
 
==Strategies==
 
*The [[I AM ERROR]] room in [[Cathedral]] and [[Sheol]] will have a beam of light/trap door leading to the next floor, even if Isaac doesn't have [[Polaroid]] or [[The Negative]].
 
*[[The Chest]] and [[Dark Room]] are reset on exiting the I AM ERROR room, which can be done repeatedly as long as the player is able to gather enough charges to successfully warp to it. This can provide a ridiculous number of items from the golden chests in The Chest.
 
** This makes it possible to kill [[??? (Boss)|???]] or [[The Lamb|Lamb]] multiple times. If Isaac has an item that resurrects him as a different character, multiple achievements and items can be unlocked in a single run.
 
** {{Afterbirth+}} [[The Void]] is also reset and can be cleared repeatedly.
 
*{{Afterbirth}} As there are no [[I AM ERROR]] rooms in [[The Chest]], the [[Dark Room]] and [[Ultra Greed]] in Afterbirth, these floors cannot be cleared repeatedly.
 
   
 
==Seeds==
 
==Seeds==
{{PlatPC}} TRP0 FE16 (first treasure room, adjacent to spawn)
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{{plat|PC}} TRP0 FE16 (first treasure room, adjacent to spawn)
{{PlatPC}} 9YDH V6SL (first treasure room, adjacent to spawn)
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{{plat|PC}} 9YDH V6SL (first treasure room, adjacent to spawn)
{{PlatPC}} F189 W42E (first treasure room, adjacent to spawn. Teleports to [[I AM ERROR]] room upon first use in hard mode.)
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{{plat|PC}} F189 W42E (first treasure room, adjacent to spawn. Teleports to [[I AM ERROR]] room upon first use in hard mode.)
{{PlatPC}} 0JGY 6ZWX (first treasure room near spawn)
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{{plat|PC}} 0JGY 6ZWX (first treasure room near spawn)
{{PlatPC}} W0WZ QCRJ (first treasure room, adjacent to spawn)
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{{plat|PC}} W0WZ QCRJ (first treasure room, adjacent to spawn)
{{PlatPC}} 6AGC GCCH (first treasure room, adjacent to spawn)
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{{plat|PC}} 6AGC GCCH (first treasure room, adjacent to spawn)
{{PlatPS4}} SJKJ XZB2 (first treasure room, adjacent to spawn)
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{{plat|PS4}} SJKJ XZB2 (first treasure room, adjacent to spawn)
{{PlatVita}} 4CG9 42ED (first treasure room, adjacent to spawn)
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{{plat|Vita}} 4CG9 42ED (first treasure room, adjacent to spawn)
{{Plat3DS}} 8LQF 7MT0 (first floor treasure room)
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{{plat|3DS}} YAD2 KJCM (first treasure room, adjacent to spawn)
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{{plat|3DS}} 8LQF 7MT0 (first floor treasure room)
 
==Trivia==
 
* The item is a reference to a bug in the original ''The Binding of Isaac'', where exhausting an [[Item Pool]] (or rarely simply by chance) would cause an undefined item to spawn.
 
*In programming "Undefined" refers to an unknown value.
 
*Given the Glitch theme of the item and the ability to access [[Chapters]] that have not yet been unlocked using [[I AM ERROR]], along with the ability to acquire mass upgrades in The Chest and The Dark Room, it is possible that it was intentionally made into a powerful sequence-breaking item.
 
*The sprite for Undefined appears to be, fittingly, a glitched and spliced version of other item sprites, noticeably the bottom right part being the [[The Compass|Compass]], the bottom left being the [[Blood Bag]], and the top half being [[Contract From Below]].
 
*Once all the items have been exhausted in a reset Chest run, chests will only drop [[Breakfast]] HP upgrades.
 
   
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{{nav|glitch|eden unlock}}
 
[[Category:Items]]
 
[[Category:Items]]
 
[[Category:Activated Collectibles]]
 
[[Category:Activated Collectibles]]

Revision as of 09:44, 16 May 2021

Undefined is an unlockable activated item.

Effects

Strategies

  • The I AM ERROR room in Template:Stage and Template:Stage will have a beam of light/trap door leading to the next floor, even if Isaac doesn't have Collectible The Polaroid iconThe Polaroid or Collectible The Negative iconThe Negative.
  • (in Rebirth) Template:Stage and Template:Stage are reset on exiting the I AM ERROR room, which can be done repeatedly as long as the player can gather enough charges to successfully warp to it. This can provide a ridiculous number of items from the golden chests in Template:Stage.
    • This makes it possible to kill ??? or Lamb multiple times. If Isaac has an item that resurrects him as a different character, multiple achievements and items can be unlocked in a single run.
    • (in Afterbirth † and Repentance) Template:Stage is also reset and can be cleared repeatedly.
  • (in Repentance) As no Secret Rooms or Super Secret Rooms spawn on any floor during the Ascent, this item will only warp Isaac to either the Treasure Room or the I AM ERROR room. This can be a reliable method of gaining many items on the way up to Template:Stage, while also allowing the player to skip potentially difficult encounters.

In-game Footage

Trivia

  • The item is a reference to a bug in the original The Binding of Isaac, where exhausting an Item Pool (or rarely simply by chance) would cause an item to spawn whose name and description was listed as "Undefined", and whose sprite would rapidly cycle through the sprites of every other item in the game. Undefined by itself creates no effect, but if it was ever picked up, should the game attempt to spawn an item from an exhausted item pool, the game instead crashed, as it could no longer spawn Undefined. From Rebirth onwards, an exhausted item pool will instead spawn Collectible Breakfast iconBreakfast, even if the item would normally never spawn from that item pool and/or Breakfast had already been obtained in the run.
  • In programming "Undefined" refers to an unknown value.
  • Given the Glitch theme of the item and the ability to access Chapters that have not yet been unlocked using I AM ERROR, along with the ability to acquire mass upgrades in The Chest and The Dark Room, it is possible that it was intentionally made into a powerful sequence-breaking item.
  • The sprite for Undefined appears to be, fittingly, a glitched and spliced version of other item sprites, with the bottom right part noticeably being the Collectible The Compass iconThe Compass, the bottom left being the Collectible Blood Bag iconBlood Bag, and the top half being Collectible Contract From Below iconContract From Below. This may also be a reference to Undefined's sprite in the original The Binding of Isaac.

Gallery

Seeds

PC TRP0 FE16 (first treasure room, adjacent to spawn)

PC 9YDH V6SL (first treasure room, adjacent to spawn)

PC F189 W42E (first treasure room, adjacent to spawn. Teleports to I AM ERROR room upon first use in hard mode.)

PC 0JGY 6ZWX (first treasure room near spawn)

PC W0WZ QCRJ (first treasure room, adjacent to spawn)

PC 6AGC GCCH (first treasure room, adjacent to spawn)

PS4 SJKJ XZB2 (first treasure room, adjacent to spawn)

Vita 4CG9 42ED (first treasure room, adjacent to spawn)

3DS YAD2 KJCM (first treasure room, adjacent to spawn)

3DS 8LQF 7MT0 (first floor treasure room)