Secret Room

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Secret Room Door.png

Secret Rooms are rooms that are not normally visible on the map and must be bombed into to access. Regular secret rooms are usually located next to 2 to 4 rooms, while super secret rooms can only be next to one room. Very rarely, the regular secret room may also be located next to only one room. Entrances to Secret Rooms will never have rocks or gaps in the way. Secret Rooms usually contain at least one shopkeeper. Secret Rooms stay open after bombing them.

Variations[edit | edit source]

The following room maps were made using Basement Renovator for cleaner viewing; note that all Urns you see will be Mushrooms when encountered in-game.

Standard[edit | edit source]

ID Weight Contents Image preview
0 1.0 One item. SecretRoom 0.png
1 1.0 Three coins. SecretRoom 1.png
2 1.0 Six coins. SecretRoom 2.png
3 1.0 Nine coins. SecretRoom 3.png
4 1.0 A slot machine. SecretRoom 4.png
5 1.0 Three random pickups and five mushrooms. SecretRoom 5.png
6 1.0 A chest and two TNT barrels. SecretRoom 6.png
7 1.0 Three pills and two mushrooms. SecretRoom 7.png
8 1.0 Three coins. SecretRoom 8.png
9 1.0 Three bomb pickups. SecretRoom 9.png
10 1.0 A lil' battery. SecretRoom 10.png
11 1.0 Two keys. SecretRoom 11.png
12 1.0 Two bomb pickups and four shopkeepers. SecretRoom 12.png
13 1.0 A key, a key master, and two mushrooms. This is the only regular secret room that doesn't have a shopkeeper. SecretRoom 13.png
14 1.0 A golden poop and three shopkeepers. SecretRoom 14.png
15 1.0 A Double bomb and twenty mushrooms. SecretRoom 15.png
16 1.0 A corny poop. SecretRoom 16.png
17 Added in Afterbirth 1.0 Two reward plates. SecretRoom 17.png
18 Added in Afterbirth 1.0 Four spiders and four random pickups. SecretRoom 18.png
19 Added in Afterbirth 1.0 An item behind gaps. The four rocks have equal, independent chances of being rocks, spikes, fireplaces, or iron blocks. SecretRoom 19.png
20 Added in Afterbirth 1.0 A reward plate. SecretRoom 20.png
21 Added in Afterbirth 1.0 Two rewards behind rocks and key blocks. The rewards have equal, independent chances of being a sack, item, chest, locked chest, or random pickup. SecretRoom 21.png
22 Added in Afterbirth 1.0 A nickel and three shopkeepers. SecretRoom 22.png
23 Added in Afterbirth † 1.0 A sack and a restock box. SecretRoom 23.png
24 Added in Afterbirth † 1.0 Ten mushrooms. SecretRoom 24.png
25 Added in Afterbirth † 1.0 Two sacks. SecretRoom 25.png
26 Added in Afterbirth † 1.0 Six mushrooms, two poops, and a troll bomb, which will blow up three of the mushrooms. SecretRoom 26.png
27 Added in Afterbirth † 1.0 Two reward plates. SecretRoom 27.png
28 Added in Afterbirth † 0.1 An item, two chests, a poop, and three black flies. SecretRoom 28.png
29 Added in Afterbirth † 0.1 An item behind iron blocks, four purple fireplaces, and five shopkeepers. SecretRoom 29.png

On Caves 2 and later, Greed and Super Greed have a chance to replace secret rooms.

Seeds[edit | edit source]

PC Normal mode only 927Q 481S (Secret Room above Treasure Room is not attached to any others)

PC Hard mode only 2CC7 S7YG (Secret room is attached to only one room; located on the eastern wall in the most eastern room starting from the spawn room)

Super Secret Rooms[edit | edit source]

Secret Room Door.png

Super Secret Rooms are only located next to one other room, and this room can't be a special room (item, shop, boss, etc.). Each Super Secret room has set drops depending on the floor. Note that the type of Super Secret Room is not limited to certain floors it mimics (e.g. one can find a Womb-themed Super Secret Room in the Depths).

Possible Spawns[edit | edit source]

ID Floor layout Contents Image preview
0 The Womb The Womb 8 Red Hearts. Only red hearts can spawn in this room, regardless of any items. If you let 15►Dark Bum Dark Bum collect the hearts, he will drop red hearts instead of soul hearts. Allow him to pick up the hearts and leave the room quickly, where he will drop the soul hearts or black hearts outside. Secretheart.png
1 Cathedral Cathedral Eternal Heart. Only eternal hearts can spawn in this room, regardless of any items used. For example, using 15►The Jar The Jar will drop Eternal Hearts on the ground instead of regular hearts. Using VI - The Lovers VI - The Lovers or V - The Hierophant V - The Hierophant will do the same, too. Eternalheartroom.png
2 Sheol Sheol Red Chest. Secretredchest.png
3 Necropolis Necropolis Fortune Telling Machine. Secretmachine.png
4 The Cellar The Cellar Random trinket. Secrettricket.png
5 The Basement The Basement 5 pills. Secretpills.png
6 Added in Afterbirth Library Black Heart. Only black hearts can spawn in this room, regardless of items used. This applies to VI - The Lovers VI - The Lovers, V - The Hierophant V - The Hierophant and similar items. SecretLibrary.png
7 Dark Room Dark Room Removed in Afterbirth Black Heart. Blackheartroom.png
Added in Afterbirth 4 Nulls and 5 pills or runes. SecretDarkRoom.png
8 Burning Basement Burning Basement A Shopkeeper, 2 Bomb Chests, 3 TNT, and 18 Fire Places, including Red Fire Places.
Added in Repentance All Fire Places in the room will be extinguished if this room appears in Downpour Downpour or Dross Dross.
9 Flooded Caves Flooded Caves A black poop surrounded by 6 spikes. SecretBlackPoop.png
10 Added in Afterbirth I AM ERROR Can include any of the following: Mom's Hand, Rag Man, random pickups, chests, cards, trinkets, pills and items. Unknown Room.png
11 Added in Afterbirth The Womb The Womb 4 red poops and 3 Double Hearts. SecretOnePlusOneFree.png
12 Added in Afterbirth † Cathedral Cathedral 3 Soul Hearts, 2 Blue Fire Places and an angel Statue in the center which will drop its key piece upon death. SecretAngel.png
13 Sheol Sheol 3 Black Hearts and 2 Black Globin's Heads. SecretGlobinHeads.png
14 Shop A Beggar and a Blood Donation Machine. SecretShop.png
15 Added in Afterbirth † The Womb The Womb A red poop, 3 Black Flies and a random amount of Red Hearts and Half Red Hearts. It can also contain a random amount of any other heart types, except Double Hearts. SecretWombNew.png
16 Added in Afterbirth † Cathedral Cathedral A rainbow poop, 3 Black Flies and 2 Eternal Hearts. SecretRainbow.png
17 Added in Afterbirth † Sheol Sheol A black poop, 3 Black Flies and 6 Red Chests. SecretSheolNew.png
18 Added in Afterbirth † Shop 3 Slot Machines and 2 Fortune Telling Machines. SecretShopMachines.png
19 Added in Afterbirth † The Basement The Basement A red poop, 9 pills and 3 Black Flies. SecretBasementNew.png

Added in Afterbirth Greed Mode[edit | edit source]

In Greed Mode, Super Secret Rooms have different layouts.

ID Floor layout Contents Image preview
0 The Womb The Womb 5 Red Hearts; only Red Hearts can spawn in this room, regardless of items used. SuperSecret Greed0.png
1 Arcade 5 Pennies. SuperSecret Greed1.png
2 The Caves The Caves 3 Keys. SuperSecret Greed2.png
3 Burning Basement Burning Basement 3 Bombs. SuperSecret Greed3.png
4 Cathedral Cathedral 2 Soul Hearts. SuperSecret Greed4.png
5 Library A Black Heart. SuperSecret Greed5.png
6 The Chest The Chest A Chest; small chance to spawn another type of chest instead. SuperSecret Greed6.png
7 The Chest The Chest A Bomb Chest. SuperSecret Greed7.png
8 Sheol Sheol A Red Chest. SuperSecret Greed8.png
9 The Basement The Basement 4 pills. SuperSecret Greed9.png
10 Library 2 cards. SuperSecret Greed10.png
11 The Cellar The Cellar 4 Lil' Batteries. SuperSecret Greed11.png
12 Dark Room Dark Room 2 runes. SuperSecret Greed12.png
13 Sheol Sheol 2 Red Chests. SuperSecret Greed13.png
14 The Cellar The Cellar 2 trinkets. SuperSecret Greed14.png
15 The Cellar The Cellar A trinket. SuperSecret Greed15.png
16 Bedroom A bed. SuperSecret Greed16.png
17 I AM ERROR A trapdoor to the next floor. SuperSecret Greed17.png
18 The Basement The Basement 17 piles of poop. SuperSecret Greed18.png
19 The Shop The Shop A Golden Bomb. SuperSecret Greed19.png
20 The Shop The Shop A golden poop. SuperSecret Greed20.png
21 The Shop The Shop A Golden Key. SuperSecret Greed21.png
22 The Catacombs The Catacombs A random item from the Greed mode Treasure Room pool. SuperSecret Greed22.png
23 The Chest The Chest 2 Locked Chests. SuperSecret Greed23.png
24 Cathedral Cathedral 1 Eternal Heart. SuperSecret Greed24.png
25 The Womb The Womb 1 Half Red Heart. SuperSecret Greed25.png

Added in Repentance Ultra Secret Rooms[edit | edit source]

Ultra secret rooms are special rooms that are not connected to any other rooms on the map. They can only be entered by using 15►Red Key Red Key, Crystal Key Crystal Key, Cracked Key Cracked Key or Soul of Cain Soul of Cain to get to a red room adjacent to it, or teleporting directly into it with XVIII - The Moon? XVIII - The Moon?. Ultra secret room doors are automatically open and do not have to be opened. If teleported into with the card, the pathway back to the rest of the level is also opened. All items generated in them will be from the Angel Room item pool.

Ultra Secret Rooms always generate connected to two valid red room locations that are directly next to any non-red room on the floor. Standard methods of mapping such as 15►Blue Map Blue Map and 15►The Mind The Mind do not reveal them, but they can be located by 15►Cracked Orb Cracked Orb or 15►Book of Virtues Book of Virtues wisps with the 15►Book of Secrets Book of Secrets effect, or a Rune shard. When found, they are marked by a red ? on the map.

Most of times Isaac can find two red rooms which are adjacent to both the Ultra Secret Room and non-red rooms. These red rooms may not connect to the same non-red room though. Use this mechanic to figure out the possible location of the Ultra Secret Room.

  • However, in rare condition, only one red room connects the Ultra Secret Room and normal rooms.

Layouts[edit | edit source]

Notes[edit | edit source]

  • Secret rooms are found by bombing the middle of a wall in a standard size room. For larger size rooms, divide the room mentally into the size of individual rooms to figure out where to bomb. For closet-size rooms, Secret rooms will never be found by bombing the sides but may be found by bombing the wall at the end of the closet.
  • Rooms adjacent to secret rooms will always have a clear, walkable path to the middle of the wall where you can set a bomb. Secret Room entrances are never found in front of gaps, obstacles, or spikes. All the rooms next to a Secret Room must satisfy these requirements, so if one room near a suspicious gap in the map fails these requirements, then look elsewhere.
    • Cobwebs are sometimes next to Secret Room entrances.
  • If there are no valid Secret Room locations surrounded by 3 or 4 rooms, it is possible for a Secret Room to be adjacent to only 1 or 2 rooms.
A secret room adjacent to only one room
A secret room adjacent to only one room
  • 15►X-Ray Vision X-Ray Vision opens all available entrances to both the secret room and the super secret room. The I Can See Forever pill does the same for the floor on which the pill was used. Added in Afterbirth †15►Dog Tooth Dog Tooth will play a howl sound effect if adjacent to a Secret Room or Super Secret room, and Added in Afterbirth †15►YO LISTEN! YO LISTEN! will hover over secret room entrances.
  • Teleportation items can randomly teleport Isaac into Secret Rooms, and XVIII - The Moon XVIII - The Moon card will always teleport Isaac to the Secret Room.
  • Secret Rooms are revealed on the map with 15►Crystal Ball Crystal Ball, 15►Book of Secrets Book of Secrets, XXI - The World XXI - The World card, XIX - The Sun XIX - The Sun card, 15►Spelunker Hat Spelunker Hat, 15►Blue Map Blue Map, or 15►The Mind The Mind, but you'll still need to open their entrance.
  • Added in Repentance15►Red Key Red Key can be used to find secret rooms. Lack of red door frame means a secret room could have generated on the other side.
  • If Greed or Super Greed spawn into the Secret Room, you won't be able to exit it (like a Mini-Boss room), but once the fight ends, all the exits of the Secret Room will be accessible.
  • Secret Rooms can exist next to all types of rooms except Boss Rooms, allowing certain restricted rooms to be entered.
    • Even if you have no keys, it is possible to bomb into a locked special room should there exist an adjacent Secret Room. Leaving through the door will unlock the room without requiring a key.
    • It is possible to enter Curse Rooms without taking damage by bombing in from a secret room.
    • It is possible to access Challenge Rooms even if you don't meet the health requirements, but it is not possible to "steal" the items, as the hole will be blocked up as soon as the fighting stage begins. However, items can still be stolen by using Telepills or other teleportation items. The Challenge Room will not be accessible from the Secret Room if the Secret Room contained a fight with Super Greed. Boards will remain over the entrance to the challenge room even after the fight is over.
  • Super secret rooms replace the dead-end room that would require the 2nd most rooms walked through from the start room to access, and cannot be connected to the secret room.
    • For reference, the Boss Room takes the dead-end room that would require the most rooms walked through, and the Shop takes the room that would require the 3rd most. This means that the Super Secret Room is equally as far or further from the start room than the Shop. It also means the Super Secret Room tends to be close to the Boss Room. Loops and large rooms connected to more than one room on any given side can tamper with this logic, however.
  • Super Secret Rooms can have layouts from floors the player hasn't unlocked yet.

Trivia[edit | edit source]

  • In the original Binding of Isaac, secret rooms worked differently; if the player left a room after opening a secret room entrance, the entrance would close. To open the room, the player needed another bomb to open the entrance.

Bugs[edit | edit source]

Bug Bug! After defeating an Angel spawned in a Super Secret Room, the music will not return to the floor's regular music.
Bug Bug! Teleporting to the Super Secret Room in Greed or Greedier Mode, when the room is generated behind a still-locked Treasure Room, will trap the player inside.

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
Room 1x1 small.png
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
Super Secret Room Icon.png
Super Secret Room
Super Secret Room Icon.png
Crawl Space
Super Secret Room Icon.png
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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