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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.

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 pickups, chests, items, and obstacles.

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.

Added in Afterbirth 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 Rooms


Boss Rooms contain one of the many Bosses, with victory granting Isaac an item from the Boss pool, hearts (depending on difficulty), and a trap door leading to the next level.

Mini-Boss Room

Mini-Boss Rooms are identical in appearance to normal Rooms and contain one of the Seven Deadly Sins.

Treasure Rooms


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 pool. Various obstacles may be present, and occasionally Added in Afterbirth Flies or Added in Afterbirth † Greed Gapers 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 attack flies, and various pickups, including one trinket.

Red Treasure Room Added in Repentance

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With the Added in RepentanceDevil's Crown 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.


Added in Repentance

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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 Door.png

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. Arcades can contain machines, beggars, and other objects.

Challenge Rooms

Normal Challenge Room

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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

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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 Bosses instead of normal monsters.

Added in Repentance 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 the Boss Item Pool.

Curse Rooms

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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 items.

Sacrifice Rooms

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

Added in Afterbirth Sacrifice Rooms now can pay with a much wider variety of rewards.

Secret Rooms

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Secret Rooms must be bombed into, and are usually surrounded by 3 or 4 Rooms. Secret Rooms usually contain shopkeepers and various pickups.

Super Secret Rooms

Secret Room Door.png

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

Ultra Secret Rooms Added in Repentance

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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  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, key blocks and/or shopkeepers, and one item from the Angel Room item pool for it's pedestal rewards.


Added in Repentance

Library door locked.png
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Libraries require a key to be entered and can contain books, cards, runes, and trinkets.

Devil Rooms

Devil Room.png

These Rooms allow the player to make deals with the Devil by trading health for items. Devil Rooms can also contain red chests, black hearts, spikes, or monsters.

Angel Rooms

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


Added in Repentance

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Vaults require two keys to open and can contain various things, ranging from items to donation machines.

Dice Rooms

Added in Repentance

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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 effect.


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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 Removed in Afterbirthand 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 spaces

Secret Trap Door.png

These Rooms are entered through trapdoors with ladders in them. They can rarely be found under destroyed rocks. They can also be found using 15►We Need to Go Deeper! We Need to Go Deeper!, Rune of Ehwaz 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 pickups. Rarely, the Crawl Space will lead to a black market.

Red Rooms Added in Repentance

Red Rooms are special rooms created when using the Red Key,  Crystal Key,  Cracked Key or the  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.

Black markets

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 machines or beggars.

Underground Shops Added in Repentance

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 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 pickups or items. The only way out of an I AM ERROR Room is through this trapdoor or by teleporting out.

Boss Rush

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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 rocks or spikes. Taking one of the presented items will destroy the others and begin the Boss Rush.

Mega Satan Arena

Mega Satan Door.png

This Room is only found in the starting Room of and Dark Room Dark Room. Opening this door requires 15►Dad's Key Dad's Key or the two key pieces from Angels. Once the Room is entered, Isaac will have to face off against Mega Satan.

Added in Afterbirth ??? Entrance

??? 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 ??? ???.

Added in Repentance Exit Rooms

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When unlocked, these Rooms appear next to a main path boss once the boss is defeated (or at the end of alternate path 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.

Added in Afterbirth Closets

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

Added in Afterbirth † Grave Rooms

Grave Rooms are Rooms that appear in the Dark Room which contain dirt patches.

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Added in Repentance Planetariums

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Planetariums are similar to Treasure Rooms, but only contain one special item belonging to Planetarium (Item Pool) that is only available through Planetariums.


  • 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 buttons that do not have enemies or only have indestructible enemies such as Wall Huggers or Grimaces.


SmallIsaac.png Rooms SmallIsaac.png

Unlocked Added in Afterbirth Added in Afterbirth †
Boss Room Icon.png
Boss Room
Mini-Boss Room Icon.png
Mini-Boss Room
Curse Room Icon.png
Curse Room
Sacrifice Room Icon.png
Sacrifice Room
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Room 1x1.png
Grave Room
Locked Added in Repentance
Treasure Room Icon.png
Treasure Room
Shop Icon.png
Library Icon.png
Planetarium Icon.png
Slotted Arcade Icon.png
Barred Challenge Room Icon.png
Challenge Room
Boss Challenge Room Icon.png
Boss Challenge Room
Double-locked Vault Icon.png
Dice Room Icon.png
Dice Room
Double-boarded Bedroom Icon.png Bedroom2 Icon.png
Hidden Added in Repentance
Secret Room Icon.png
Secret Room
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Super Secret Room
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Crawl Space
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Black Market
Super Secret Room Icon.png
Ultra Secret Room Icon.png
Ultra Secret Room
Post-boss Added in Afterbirth
Devil Room Icon.png
Devil Room
Angel Room Icon.png
Angel Room
Super Secret Room Icon.png
Boss Rush
Super Secret Room Icon.png
Blue Womb Entrance
The Binding of Isaac: Rebirth The Binding of Isaac: Rebirth The Binding of Isaac: Rebirth
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