View source for Rooms

Each [[floor]] of the game is made up of a number of '''Rooms'''. The number of Rooms on each floor generally increases as the game progresses.
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== Normal Rooms ==
Normal Rooms make up the majority of the Rooms on a floor. These Rooms typically contain enemies and may drop a [[pickup]] or chest after all enemies are killed. Many Rooms also contain various [[pickup]]s, [[chest]]s, [[item]]s, and [[obstacle]]s.

Isaac cannot leave a Room with enemies until they are all killed or until a door is opened with an explosion. If Isaac is currently holding an [[active item]], completing a Room with enemies will add one charge.

Rooms can come in various sizes; while normal-sized Rooms are the most common, double and quadruple-sized Rooms can also appear. 

{{dlc|a}} L-shaped triple-sized Rooms, narrow hallways, and tiny Rooms can also appear. Additionally, completing a quadruple-sized Room or an L-shaped Room will add two charges to Isaac's active item.
* The last wave of [[Boss Rush]] adds only one charge.

== Special Rooms ==
=== [[Boss room|Boss Room]]s ===
[[file:bossroom.png|98px|link=Boss room door opened]]

Boss Rooms contain one of the many [[Boss]]es, with victory granting Isaac an item from the [[Boss (Item Pool)|Boss pool]], [[heart]]s (depending on difficulty), and a trap door leading to the next level.

==== [[Mini-Boss room|Mini-Boss Room]] ====
Mini-Boss Rooms are identical in appearance to normal Rooms and contain one of the [[Seven Deadly Sins]].

=== [[Treasure room|Treasure Room]]s ===
{{slideshow
 | [[file:itemroomdoor.png|98px|link=Treasure Room door open]]
 | [[file:lockeditemroomdoor.png|98px|link=Treasure Room door locked]]
}}

A treasure Room, or item Room, is guaranteed to appear on all floors From Basement 1 to Depths 2. From Basement 2 and on, this Room requires a key to enter. The Room contains one item from the [[Treasure Room (Item Pool)|treasure pool]]. Various [[obstacle]]s may be present, and occasionally {{dlc|a}} [[Fly|Flies]] or {{dlc|a+}} [[Greed Gaper]]s will be present. This Room has a small chance to contain two items from the treasure pool that can both be collected, and a ''very'' small chance of containing no item pedestal at all, instead containing one poop pile, 3 [[Fly|attack flies]], and various [[pickups]], including one [[Trinkets|trinket]].

====[[Devil's Crown|Red Treasure Room]] {{dlc|r}}====
{{slideshow
 | [[File:Devil Treasure Room door.png|98px|link=Devil Treasure Room door opened]]
 | [[File:Devil Treasure Room door locked.png|98px|link= Devil Treasure Room door locked]]
}}
With the {{t|Devil's Crown}} picked up/in your trinket slot, Any newly found Treasure Room becomes a Devil/Red Treasure Room, 
containing items from the Devil Room pool that can be bought for the usual number of Heart containers requested in devil rooms.

=== [[Shop]]s ===
{{Dlc|r}}<br />{{slideshow
 | [[file:Shop door locked.png|98px|link=Repentance Shop door locked]]
 | [[file:Shop door.png|98px|link=Repentance Shop door opened]]}}
[[file:Locked Door.png|98px|link=Shop door locked]]

Shops sell various items in exchange for coins. Shops start at level 0 and only sell 2 items, but shops at higher levels sell more items. They can be upgraded through the [[donation machine]], which can be commonly found in the shops and sometimes in an [[arcade]].
Shops also have a chance of being replaced by a miniboss Room containing [[Greed]] or [[Super Greed]].

=== [[Arcade]]s ===
[[file:Arcade Door.png|98px|link=Arcade Door insert coin]]

These Rooms are locked and require one coin to be opened. Arcades can only spawn on even floors (Basement II, Caves II, Depths II, Utero II) or XL floors if the previous floor was completed with 5 or more coins. [[Arcade]]s can contain [[machine]]s, [[beggar]]s, and other objects.

=== Challenge Rooms ===

==== [[Normal challenge room|Normal Challenge Room]] ====
[[file:Challenge Room.png|98px|link=Normal Challenge Room door opened]]

Challenge Rooms can only be entered if Isaac's total health (red, black, and soul hearts) is equal to or greater than his number of heart containers. Upon picking up its contents, Isaac has to fight three waves of enemies.

==== [[Boss challenge room|Boss Challenge Room]] ====
[[file:Boss Challenge Room Door.png|98px|link=Boss Challenge Room door opened]]

Boss challenge Rooms can only be entered if Isaac has one or less red heart. Its contents are similar to the Normal Challenge Room, but upon picking up its contents, Isaac has to fight two waves of [[Boss]]es instead of normal monsters.

{{dlc|r}} Boss Challenge Rooms now can only be entered normally if Isaac's total health (red, black, and soul hearts) is equal to or less than 1 full heart, but now always contain an item from [[Boss (Item Pool)|the Boss Item Pool]].

=== [[Curse room|Curse Room]]s ===
[[file:Curse Room Door.png|98px|link=Curse Room door opened]]

Curse Rooms feature spikes on the door that hurt Isaac when entering and exiting the Room. Curse Rooms can contain various things, ranging from enemies to [[item]]s.

=== [[Sacrifice room|Sacrifice Room]]s ===
[[file:Sacrifice Room door.png|98px|link=sacrifice Room Door opened]]

Sacrifice Rooms have a chance to spawn a [[chest]] after Isaac damages himself on the spikes featured at the center of the Room.

{{dlc|a}} Sacrifice Rooms now can pay with a much wider variety of rewards.

===[[Secret room|Secret Room]]s===
[[file:Secret Room Door.png|98px|link=Secret Room Passage bombed]]

Secret Rooms must be bombed into, and are usually surrounded by 3 or 4 Rooms. Secret Rooms usually contain [[shopkeeper]]s and various [[pickup]]s.

=== [[Super secret room|Super Secret Room]]s ===
[[file:Secret Room Door.png|98px|link=Super Secret Room Passage bombed]]

Super secret Rooms must be bombed into, and are only located next to one other Room. Super Secret Rooms can contain a variety of [[pickup]]s.

=== [[Secret Room|Ultra Secret Rooms]] {{Dlc|r}} ===
[[file:Secret Room Door.png|98px|link=Ultra Secret Room Passage opened?]]

Ultra secret Rooms are very secret rooms, found when venturing one Red Room outside the normal map using the [[Red Key]],  [[Crystal Key]],  [[Cracked Key]] or the  [[Cards and Runes|Soul of Cain]]. These map expanding items allows you to create red rooms, and if correctly found, one of those new rooms will have a secret room passageway to the ultra secret room already opened. The ultra secret room itself contains [[keys]], [[Blocks|key blocks]] and/or [[Shopkeeper|shopkeepers]], and one item from the [[Angel Room (Item Pool)|Angel Room item pool]] for it's pedestal rewards.

=== [[Library|Libraries]] ===
{{Dlc|r}}{{slideshow
 | [[file:Library door locked.png|98px|link=Repentance Library door locked]]
 | [[file:Library door.png|98px|link=Repentance Library door opened]]}}
[[file:Locked Door.png|98px|link=Library door locked]]

Libraries require a key to be entered and can contain books, [[card]]s, [[rune]]s, and [[trinket]]s.

=== [[Devil room|Devil Room]]s ===
[[file:Devil Room.png|98px|link=Devil Room Door]]

These Rooms allow the player to make deals with the [[Satan|Devil]] by trading [[health]] for [[Devil Room (Item Pool)|items]]. Devil Rooms can also contain [[red chest]]s, [[black heart]]s, [[spikes]], or [[monster]]s.

=== [[Angel room|Angel Room]]s ===
[[file:Angel Room.png|98px|link=Angel Room Door]]

Angel Rooms contain an angel statue and an [[item]], [[soul heart]]s, or [[eternal heart]]s. The Angel Room has a chance to replace the Devil Room if certain conditions are met.

=== [[Vault]]s ===
{{Dlc|r}}{{slideshow
 | [[file:Vault door locked.png|98px|link=Repentance Vault Room door double locked]]
 | [[file:Vault door.png|98px|link=Repentance Vault Room door]]}}
[[file:Double Locked Room.png|98px|link=Vault Room door double locked]]

Vaults require two keys to open and can contain various things, ranging from [[item]]s to [[donation machine]]s.

=== [[Dice room|Dice Room]]s ===
{{Dlc|r}}{{slideshow
 | [[file:Dice Room door locked.png|98px|link=Repentance Dice Room door double locked]]
 | [[file:Dice Room door.png|98px|link=Repentance Dice Room door opened]]}}
[[file:Double Locked Room.png|98px|link=Dice Room door double locked]]

Dice Rooms require two keys to open. Depending on the number imprinted on the large red die embedded in the floor, stepping onto the center of the die activates an [[dice room#effects|effect]].

=== [[Bedroom]]s ===
[[file:Double Boarded Room.png|98px|link=Bedroom door boarded shut]]

Bedrooms require two bombs to open. Bedrooms contain a bed that can be used once to restore all of the player's health, or if they have no red hearts they give you 3 soul hearts {{dlc|na}}and add one charge their active item. 

Depending on if the Bedroom is clean or dirty, bombing the center of the carpet will reveal a [[crawl space]] or a trapdoor leading to the next floor.

=== [[Crawl space]]s ===
[[file:Secret_Trap_Door.png|98px|link=Crawl Space ladder Trapdoor]]

These Rooms are entered through trapdoors with ladders in them. They can rarely be found under destroyed rocks. They can also be found using {{i|We Need to Go Deeper!}}, {{p|Rune of Ehwaz}}, or in a [[clean bedroom]]. These Rooms are viewed from the side, rather than the top like the rest of the Rooms in the game. Crawl Spaces usually contain an item or various [[pickup]]s. Rarely, the Crawl Space will lead to a [[black market]].

===[[Red Key|Red Rooms]] {{dlc|r}}       ===
Red Rooms are special rooms created when using the [[Red Key]],  [[Crystal Key]],  [[Cracked Key]] or the  [[Cards and Runes|Soul of Cain]]. The red key rooms don't open without these items, and are spawned into existence at the closest red outline door when the item is used. The new Red Room can be a normal room on this floor, or any special room, aside from secret and boss rooms.

Red rooms can only be spawned 6 times from the center room of the map, any farther and the game takes you to a I AM ERROR Room.
<br />
=== [[Black market]]s ===

Black markets are accessed through Crawl Spaces. These Rooms are 2 Rooms wide and have 5 shop items that can all be bought for 1 heart container. Black Markets also have a trapdoor to the next floor and various [[machine]]s or [[beggar]]s.

==== Underground Shops {{dlc|r}} ====
Underground shops are accessed by buying a [[Member Card]], opening up a 'special' Shop Trapdoor that leads to the floors' underground shop. Underground shops have a wider variety of items and pickups, sold at various expensive prices.

=== [[I AM ERROR|I AM ERROR Rooms]] ===
I AM ERROR Rooms have a small chance of being reached upon teleporting. Every I AM ERROR Room contains a trapdoor to the next floor along with various [[pickup]]s or [[item]]s. The only way out of an I AM ERROR Room is through this trapdoor or by teleporting out.

=== [[Boss Rush]] ===
[[file:Boss Rush Door.png|98px|link=Boss Rush Passageway]]

If the player manages to beat [[Mom]] in under 20 minutes (visually indicated by the clock icon that appears during the cutscene between floors), a crack will open in the wall of the boss Room upon defeating her, allowing entry to a large Room with 2 or 4 item pedestals in the center or the corners, often blocked by [[rock]]s or [[spikes]]. Taking one of the presented items will destroy the others and begin the Boss Rush.

=== [[Mega Satan|Mega Satan Arena]] ===
[[file:Mega_Satan_Door.png|98px|link=Mega Satan Golden Key door]]

This Room is only found in the starting Room of {{s|The Chest}} and {{s|Dark Room}}. Opening this door requires {{i|Dad's Key}} or the two key pieces from [[Angel]]s. Once the Room is entered, Isaac will have to face off against [[Mega Satan]].

=== {{dlc|a}} [[??? (Floor)|??? Entrance]] ===
[[file:Blue Womb Door.png|98px|link=??? (floor)|??? entrance]]

If the player manages to beat [[Mom's Heart]] or [[It Lives]] in under 30 minutes (visually indicated by the clock icon that appears during the cutscene between floors), a crack will open in the wall of the boss Room upon defeating it, with a trapdoor to {{s|???}}.

=== {{dlc|r}} Exit Rooms ===
{{slideshow
 | [[file:Downpour entrance door.png|98px|link=Chapter 1.5(Downpour?) Entrance door opened]]
 | [[file:Downpour entrance door locked.png|98px|link=Chapter 1.5(Downpour?) Entrance door locked]]
}}{{slideshow
 | [[file:Mines entrance door.png|98px|link=Chapter 2.5(Mines?) Entrance door bombed open]]
 | [[file:Mines entrance door locked 2.png|98px|link=Chapter 2.5(Mines?) Entrance door boarded shut]]
 | [[file:Mines entrance door locked 1.png|98px|link=Chapter 2.5(Mines?) Entrance door bombed once]]
}}{{slideshow
 | [[file:Mausoleum entrance door.png|98px|link=Chapter 3.5(Mausoleum?)Entrance door sacrificed open]]
 | [[file:Mausoleum entrance door locked.png|98px|link=Chapter 3.5(Mausoleum?)Entrance door locked]]
}}

When unlocked, these Rooms appear next to a main path boss once the boss is defeated (or at the end of alternate path [[Chapters|chapter]]). They contain an entrance to the alternate path floors. In floors 1-2, they require a key to enter, in floors 3-4, they require two bombs and in floors 5-6, they require two hearts.

Exit room is also present in Greed mode which can be accessed once enough waves of enemies are defeated.

Exit Rooms may contain coins and enemies.

=== {{dlc|a}} [[Closet]]s ===

Closets are rare, small, dead end Rooms. They will often contain a unique arrangement of items, objects, or pickups.

=== {{dlc|a+}} [[Grave room|Grave Room]]s ===

Grave Rooms are Rooms that appear in the [[Dark Room]] which contain [[dirt patch]]es.
{{slideshow
 | [[file:DirtPatch.png|link=Grave Room Dirt Patch]]
 | [[file:DirtPatchForgotten.png|link=Grave Room Dirt Patch dug]]
}}

=== {{dlc|r}} [[Planetarium]]s ===
{{slideshow
 | [[file:Planetarium door locked.png|98px|link=Planetarium door locked]]
 | [[file:Planetarium door.png|98px|link=Planetarium door opened]]}}
Planetariums are similar to Treasure Rooms, but only contain one special item belonging to [[Planetarium (Item Pool)]] that is only available through Planetariums.

== Notes ==
* In regular Rooms with unreachable enemies, the doors will automatically open after a while to prevent Isaac from becoming unable to progress.
** This will not occur if Isaac has [[flight]] or if there is a boss or miniboss in the Room.
** This will not occur in Rooms with [[silver button]]s that do not have enemies or only have indestructible enemies such as [[Wall Hugger]]s or [[Grimace]]s.

== Gallery ==
<gallery>
File:Binding Of Octorock.jpg| [https://twitter.com/edmundmcmillen/status/1235474907489689601 The original concept art] for "Octorock," an early model of Isaac, and gameplay features. Interestingly enough, XL Rooms and L-shaped Room layouts were shown but never implemented until Rebirth and its first DLC, Afterbirth, respectively.
File:Room Concepts.jpg| Afterbirth Room layout concepts on the upper left side by Edmund McMillen.
</gallery>

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