Editing Red Key

<onlyinclude>{{ItemTable | temp={{{1}}} | disp={{{2}}}
 | name = Red Key
 | type = Active
 | id = 1027
 | quote = Explore the other side
 | description = Creates a red colored room on the map near Isaac's current position. The room can be anything from a regular encounter room to a Devil Room.
 | grid =
 | pool = [[boir: Secret Room|Secret Room]]<br>[[boir: Curse Room|Curse Room]]
 | recharge = 3
 | unlockedby = Red Key
}}</onlyinclude>

'''Red Key''' is an unlockable active [[items|item]]. 

==Effects==
* While held, a red outline of a door will appear on walls which a Red Key can be used on. 
** Approaching one of these outlines and activating the item creates a door that leads to a red room.
** The red room can be several types of rooms, including but not limited to: 
*** Regular enemy rooms
*** [[boir:Shop|Shops]]
*** [[boir:Arcade|Arcades]]
*** [[boir:Sacrifice Room|Sacrifice Rooms]]
*** [[boir:Secret Room|Secret Rooms]]
*** [[boir:Curse Room|Curse Rooms]]
*** [[boir:Bedroom|Bedrooms]]
*** [[boir:Treasure Room|Treasure Rooms]]
*** [[boir:Vault|Vaults]]
*** [[boir:Library|Libraries]]
*** [[boir:Dice Room|Dice Rooms]]
*** [[boir:Devil Room|Devil Rooms]]
*** [[boir:Angel Room|Angel Rooms]] 
*** [[boir:I AM ERROR|I AM ERROR Rooms]]
*** [[Planetarium|Planetariums]]

==Notes==
*You cannot use the item unless you are close to an outline.
*In rooms with multiple outlines, it only opens the closest one.
*A red room can be created through another red room.
*The red rooms have a physical presence on the floor unlike [[boir:Devil Room|Devil Rooms]] or [[boir:I AM ERROR|I AM ERROR rooms]] and can be re-entered at any time.
*Red rooms follow secret room rules, meaning that all other rooms it connects to must have clear space for a door to the red room.
**As a result, all red rooms are symmetrical, and if there's enough space you create a large area of red rooms.
*Although a red room can be adjacent to more than one room if the room type is one that requires something like a key, each entrance to the room will have its lock.
*You cannot build a red room outside the boundary of the map. Trying to do so will open a door which leads to the [[boir:I AM ERROR|I AM ERROR room]] instead, which you cannot return from.
**You can tell if a red door will lead to an [[boir:I AM ERROR|I AM ERROR room]] if it does not show up on the map.
**The max boundary size of a map is 13x13 rooms.
*The max number of rooms in a single floor is 128, counting all the rooms of the original map (including [[boir:Secret Room|Secret Room]] and [[boir:Secret Room|Super Secret Room]], also double and quadruple-sized rooms count as one) plus the rooms created. After the count of 128 rooms, the Red Key will not open new doors and the charge is wasted.
*Red rooms can be special rooms even in [[boir:The Womb|The Womb]] / [[boir:Utero|Utero]] / [[Corpse]], [[boir:Sheol|Sheol]], [[boir:Cathedral|Cathedral]], [[boir:Dark Room|Dark Room]] and [[boir:The Chest|The Chest]], where these types of rooms otherwise would not be generated.
**You can create I AM ERROR rooms on the Chest indefinitely, allowing you to restart the chest until the game inevitably crashes.
*Special Red Rooms are unique from the regular rooms of a floor (meaning that a Red Room shop will have its stock separate from the floor's regular shop.
*Item Rooms generated with the Red Key will only have one item pedestal, even on the Antibirth floors.
*Red rooms cannot be opened using Dad's Key.
*Red Rooms can be used to connect the Primary and Secondary areas of the [[Mausoleum]] to one another.
*Entering an [[boir:I AM ERROR|I AM ERROR]] room while in [[boir:Sheol|Sheol]] will take you to the [[boir:Dark Room|Dark Room]], even if you do not have the [[boir:The_Negative|Negative]].

==In-game Footage==
{{#ev:youtube|rhGa5rdzZx8}}

==Seeds==
JABM M6NE - Curse room next to spawn

T26E CR6B - Curse room next to spawn

9J99 2YMW- Curse room next to spawn

2ZX3 XKBQ - First-floor curse room

8EMD 1ASP - First-floor curse room

BZP1 7KLB - First-floor curse room

9FTC V9SK - Right red chest in first-floor curse room, if rerolled twice

2VPF Q402 - Eden spawns with this item.

9B6C 8TWY - Curse room next to spawn

78WE 8GWS - First-floor secret room, below spawn.

RNJL KHXY - Curse room next to spawn, re-roll the goat head into it.

==Gallery==
<gallery>
File:Red Key Rooms Map.jpg|An example of a floor filled with red rooms from Red Key.
</gallery>

== Trivia ==
* This item may be a reference to red rooms. Red rooms are an internet urban legend originating from the Deep Web, allegedly being hidden websites or services where viewers may pay money to torture or kill innocent victims.
* This item may be a reference to the item of the same name in the RPGMaker Game LISA: The First, in which it is used to access a red basement.
* In ''[[boir:The Binding of Isaac: Repentance|Repentance]]'', this item's unlock method was changed to reaching [[boir:Home|Home]] and opening the chest in Mom's room. It is also necessary to unlock the Tainted characters. Its original unlock method is referenced by [[boir:Soul of Cain|Soul of Cain]], which allows for a single-use Red Key effect on every available door.

==Bugs==
{{Bug|After quitting and re-entering the game, using Red Key will cause a no-room-config error until the next floor is reached.}}
{{Bug|Using the red key out of certain special rooms will crash the game.}}
{{Bug|Created rooms may interfere with the operation of the room-teleporters in Mausoleum, causing the teleporter to lead to the wrong room.}}
{{Bug|Creating a room where the entrance to Mega Satan resides makes Mega Satan inaccessible.}}
{{Bug|Using an I AM ERROR room created from the key on the last floor of the Corpse will send the player to a bugged version of the Sheol where the last boss will be Monstro and no Golden Chest will spawn after his death. Using another I AM ERROR room in Sheol will crash the game, rendering the key useless.}}
{{Bug|Exiting the game while in a red room will cause your entire run to be deleted. This may be because the original game code does not know where you are, so it assumes that the game never started.}}
[[Category:Items]]
[[Category:Activated Collectibles]]