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Secret Room Door Secret RoomSecret Rooms are rooms that are not normally visible on the map and are usually accessed by bombing a wall leading to them. Regular Secret Rooms are usually located next to 3 or 4 rooms, while Super Secret RoomSuper Secret Rooms can only be next to one room; they are placed on one of the dead ends generated on the map, similar to other Special Rooms. 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 ShopkeeperShopkeeper. Secret Rooms stay open after bombing them.

Variations[ | ]

The following room maps were made using Basement Renovator[1] for cleaner viewing; note that all Urns you see will be Mushrooms when encountered in-game.

Possible Layouts[ | ]

ID Weight Contents Image preview
0 1.0 1 ShopkeeperShopkeeper, 2 Fire PlaceFire Places, and 1 Secret Room item. SecretRoom 0
1 1.0 1 Shopkeeper, 2 Fire Places, and 3 random Coins. SecretRoom 1
2 1.0 1 Shopkeeper, 2 Fire Places, 4 Rocks and 6 random Coins. SecretRoom 2
3 1.0 1 Shopkeeper, 2 Fire Places, 4 Rocks, and 9 random Coins. SecretRoom 3
4 1.0 1 Shopkeeper, 4 Rocks, and 1 Slot MachineSlot Machine. SecretRoom 4
5 1.0 1 Shopkeeper, 5 Mushrooms, 4 Cobwebs, and 3 random Pickups. SecretRoom 5
6 1.0 1 Shopkeeper, 2 TNTTNT, 4 Rocks, and 1 ChestChest. SecretRoom 6
7 1.0 1 Shopkeeper, 2 Mushrooms, and 3 random Pills. SecretRoom 7
8 1.0 1 Shopkeeper surrounded by 4 Cobwebs, and 3 random Coins. SecretRoom 8
9 1.0 1 Shopkeeper, 2 Fire Places, 4 Rocks in each corner, and 3 random BombBomb pickups. SecretRoom 9
10 (except in Repentance)
1.0
(in Repentance)
0.75
1 Shopkeeper, 2 Fire Places, 2 Red Fire Places, and a Lil' BatteryLil' Battery. SecretRoom 10
11 1.0 1 Shopkeeper, and 2 random KeyKey pickups. SecretRoom 11
12 1.0 4 Shopkeepers, 1 Red Fire Place, and 2 random Bomb pickups. SecretRoom 12
13 1.0 1 Key MasterKey Master, 2 Mushrooms, and 1 random Key pickup.
(except in Repentance) This is the only Secret Room that doesn't have a Shopkeeper.
SecretRoom 13
14 (except in Repentance)
1.0
(in Repentance)
0.5
3 Shopkeepers, and 1 Golden PoopGolden Poop. SecretRoom 14
15 1.0 1 Shopkeeper, 20 Mushrooms, and 1 Double BombDouble Bomb. SecretRoom 15
16 (except in Rebirth) (except in Repentance)
1.0
(in Repentance)
0.25
1 Shopkeeper, 2 Fire Places, and 1 Corny Poop. SecretRoom 16
17 (except in Rebirth) (except in Repentance)
1.0
(in Repentance)
0.25
1 Shopkeeper, 2 Fire Places, 2 Rocks, and 2 Reward PlateReward Plates. SecretRoom 17
18 (except in Rebirth) 1.0 1 Shopkeeper, 2 Fire Places, 20 Cobwebs, 4 SpiderSpiders, and 4 random pickups. SecretRoom 18
19 (except in Rebirth) (except in Repentance)
1.0
(in Repentance)
0.5
2 Shopkeepers in the upper 2 corners, with 4 more plus a Secret Room item on the other side of several gap in the floor. There are four obstacles that have equal, independent chances of being Blocks, Fire Places, Rocks, and/or Spikes; if they are Rocks, they can be bombed to bridge the gap and allow access to the room's center. SecretRoom 19
20 (except in Rebirth) (except in Repentance)
1.0
(in Repentance)
0.25
1 Shopkeeper, 2 Fire Places, and 1 Reward Plate. SecretRoom 20
21 (in Afterbirth † and Repentance) 1.0 1 Shopkeeper, 2 Fire Places, and several Rocks and Key Blocks blocking access to 2 rewards in the upper corners. The rewards have equal, independent chances of being Chests, Locked ChestLocked Chests, (except in Rebirth) Grab BagGrab Bags, Secret Room items, and/or random pickups. SecretRoom 21
22 (in Afterbirth † and Repentance) 1.0 3 Shopkeepers, 2 Fire Places, and 1 NickelNickel. SecretRoom 22
23 (in Afterbirth † and Repentance) (except in Repentance)
1.0
(in Repentance)
0.5
1 Shopkeeper, 2 Fire Places, 1 Grab Bag, and 1 Shop Restock MachineShop Restock Machine. SecretRoom 23
24 (in Afterbirth † and Repentance) (except in Repentance)
1.0
(in Repentance)
0.25
1 Shopkeeper, 2 Blocks, and 10 Mushrooms. SecretRoom 24
25 (in Afterbirth † and Repentance) (except in Repentance)
1.0
(in Repentance)
0.5
1 Shopkeeper, 2 Fire Places, and 2 Grab Bags. SecretRoom 25
26 (in Afterbirth † and Repentance) (except in Repentance)
1.0
(in Repentance)
0.5
1 Shopkeeper, 2 Fire Places, 2 Poops, 6 Mushrooms, and 1 Troll BombTroll Bomb which will blow up 3 of the Mushrooms and the Shopkeeper. SecretRoom 26
27 (in Afterbirth † and Repentance) (except in Repentance)
1.0
(in Repentance)
0.25
1 Shopkeeper, 2 Fire Places, and 2 Reward PlateReward Plates. SecretRoom 27
28 (in Afterbirth † and Repentance) 0.1 1 Shopkeeper, 2 Fire Places, 2 ChestChests, 1 Poop surrounded by 3 FlyFlies, and 1 Secret Room item. SecretRoom 28
29 (in Afterbirth † and Repentance) 0.1 5 Shopkeepers, and 1 Secret Room item behind 4 Blocks and 4 Purple Fire Places. SecretRoom 29
30 (in Repentance) 0.1 1 Shopkeeper, 2 Fire Places, 2 Poops, and 1 Mega BatteryMega Battery. SecretRoom 30
31 (in Repentance) 0.25 1 Shopkeeper, 4 Fire Places, 44 Rocks, and 1 Rainbow PoopRainbow Poop. SecretRoom 31
32 (in Repentance) 1 1 Shopkeeper, 2 Poops, 10 Mushrooms, and 5 random Coins. SecretRoom 32
33 (in Repentance) 0.5 2 Shopkeepers, 4 Fire Places, 2 Rocks, and 3 Mushrooms and 1 rock which surround 1 random Card. SecretRoom 33
34 (in Repentance) 0.5 2 Shopkeepers, 2 Fire Places, 1 Spiked Rock in each corner, and 1 Secret Room item behind Blocks, Key Blocks, and Spikes. SecretRoom 34
35 (in Repentance) 1 1 Shopkeeper, 3 random Coins, along with 1 ChestChest and 1 Locked ChestLocked Chest each in the upper corners that are both blocked by 2 Spiked Rocks. SecretRoom 35
36 (in Repentance) 1 2 Shopkeepers, 1 Spiked Rock in each corner, and 1 random Chest that is surrounded by Rocks, which can be destroyed with 1 nearby TNTTNT which is itself behind Spikes on each side. SecretRoom 36
37 (in Repentance) 0.5 One Rotten BeggarRotten Beggar, 4 Mushrooms, and 3 random Coins. SecretRoom 37
38 (in Repentance) 0.5 1 Shopkeeper, 2 Fire Places, 1 Block in each corner, and 1 Wooden ChestWooden Chest. SecretRoom 38

Starting from the first floor of Chapter 3 onward, GreedGreed and Super GreedSuper Greed have a chance to replace Secret Rooms.

(in Repentance) Alternate Variations[ | ]

Secret Rooms in alternate chapters (DownpourDownpour, DrossDross, MinesMines, AshpitAshpit, MausoleumMausoleum, GehennaGehenna and CorpseCorpse) differ from the standard layouts. Each alternate floor has 11 unique layouts (12 in DownpourDownpour). Regular Secret Room layouts cannot appear on these floors.

Super Secret Rooms[ | ]

Secret Room Door

Super Secret RoomSuper Secret Rooms are only located next to one other room, and this room can't be a Special Room; in other words, it is placed on one of the floor's dead ends, like any other Special Room. 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. Isaac can find a WombWomb-themed Super Secret Room in DepthsDepths).

Super Secret Rooms are most likely to be found either at the end of a series of rooms that lead to a dead-end, and are particularly likely to appear near the Boss RoomBoss Room, as they are the second room type to be placed on a map during Map Generation, and are therefore placed far away from the room Isaac starts in. Because Shops are the third type of room generated, super secret rooms are also likely to spawn near the shop, and are likely to spawn in between the shop and the Boss Room.

Possible Layouts[ | ]

ID Weight Room theme Contents Image preview
0 1 WombWomb 8 random Red HeartRed Hearts. Only Red Hearts can be created in this room, regardless of what item is used to create said Hearts (e.g. V - The HierophantV - The Hierophant will create 2 Red Hearts rather than Soul Hearts). SuperSecretRoom 0
1 1 CathedralCathedral 1 Eternal HeartEternal Heart. Only Eternal Hearts can be created in this room, regardless of what item is used to create said Hearts (e.g. V - The HierophantV - The Hierophant will drop 2 Eternal Hearts rather than Soul Hearts). SuperSecretRoom 1
2 1 SheolSheol 1 Red ChestRed Chest. SuperSecretRoom 2
3 1 NecropolisNecropolis 1 Fortune Telling MachineFortune Telling Machine. SuperSecretRoom 3
4 1 CellarCellar 1 random trinket. SuperSecretRoom 4
5 1 BasementBasement 5 random Pills. SuperSecretRoom 5
6 (in Rebirth) 1 (in Rebirth) Dark RoomDark Room 1 Black HeartBlack Heart. Only Black Hearts can be created in this room, regardless of what item is used to create said Hearts (e.g. V - The HierophantV - The Hierophant will drop 2 Black Hearts rather than Soul Hearts). SuperSecretRoom 7 Rebirth
(except in Rebirth) 0.5 (except in Rebirth) LibraryLibrary SuperSecretRoom 6
7 (except in Rebirth) (in Rebirth and Afterbirth)
1
(in Afterbirth †)
0.25
(in Repentance)
0.1
Dark RoomDark Room 1 NullsNulls in each corner, and 5 random Runes. SuperSecretRoom 7 Afterbirth
8 (except in Rebirth) (except in Repentance)
1
(in Repentance)
0.5
(except in Rebirth)Burning BasementBurning Basement 1 ShopkeeperShopkeeper, 2 Bomb ChestBomb Chests, 3 TNTTNT, 13 Fire PlaceFire Places, and 5 Red Fire PlaceRed Fire Places.
(in Repentance) All Fire Places in the room will be extinguished if this room appears in (in Repentance)DownpourDownpour or (in Repentance)DrossDross.
SuperSecretRoom 8
9 (except in Rebirth) (except in Repentance)
1
(in Repentance)
0.1
(except in Rebirth)Flooded CavesFlooded Caves 1 Black PoopBlack Poop surrounded by 6 retracting Spikes. SuperSecretRoom 9
10 (except in Rebirth) (in Rebirth and Afterbirth)
1
(in Afterbirth †)
0.25
(in Repentance)
0.5
I AM ERRORI AM ERROR room Can contain any of the following: Mom's HandMom's Hand, Boss Rag Man ingameRag Man, random pickups, ChestChests, Cards, trinkets, Pills, and/or items. SuperSecretRoom 10
11 (in Afterbirth † and Repentance) 1 WombWomb 4 Red PoopRed Poops, and 3 Double HeartDouble Hearts. SuperSecretRoom 11
12 (in Afterbirth † and Repentance) 0.1 CathedralCathedral 3 Soul HeartSoul Hearts, 2 Blue Fire PlaceBlue Fire Places, and an Angel Statue which will summon an Angel if blown up, who will then drop a Key Piece upon death. Only Soul Hearts can be created in this room, regardless of what item is used to create said Hearts (e.g. The Lovers will drop 2 Soul Hearts rather than Red Hearts). SuperSecretRoom 12
13 (in Afterbirth † and Repentance) 0.1 SheolSheol 3 Black HeartBlack Hearts, and 2 Black Globin's HeadBlack Globin's Heads. Only Black Hearts can be created in this room, regardless of what item is used to create said Hearts (e.g. V - The HierophantV - The Hierophant will drop 2 Black Hearts rather than Soul Hearts). SuperSecretRoom 13
14 (in Afterbirth † and Repentance) 1 ShopShop 1 BeggarBeggar, and 1 Blood Donation MachineBlood Donation Machine. SuperSecretRoom 14
15 (in Afterbirth † and Repentance) 0.1 (except in Repentance) WombWomb 1 Red Poop surrounded by 3 FlyFlies, and a random number of various types Red HeartRed Hearts, except Double HeartDouble Hearts. SuperSecretRoom 15
(in Repentance) (except in Rebirth)Scarred WombScarred Womb SuperSecretRoom 15 Repentance
16 (in Afterbirth † and Repentance) 0.1 CathedralCathedral 1 Rainbow PoopRainbow Poop surrounded by 3 FlyFlies, and 2 Eternal HeartEternal Hearts. Only Eternal Hearts can be created in this room, regardless of what item is used to create said Hearts (e.g. V - The HierophantV - The Hierophant will drop 2 Eternal Hearts rather than Soul Hearts). SuperSecretRoom 16
17 (in Afterbirth † and Repentance) 0.1 SheolSheol 1 (except in Rebirth) Black PoopBlack Poop surrounded by 3 FlyFlies, and 6 Red ChestRed Chests. SuperSecretRoom 17
18 (in Afterbirth † and Repentance) 0.1 ShopShop 2 Fortune Telling MachineFortune Telling Machines and 3 Slot MachineSlot Machines. SuperSecretRoom 18
19 (in Afterbirth † and Repentance) 0.1 BasementBasement 1 Red PoopRed Poop surrounded by 3 FlyFlies, and 9 random Pills. SuperSecretRoom 19
20 (in Repentance) 0.5 LibraryLibrary 1 Battery BumBattery Bum, 4 Urns, 2 Cobwebs, and 3 random Coins. SuperSecretRoom 20
21 (in Repentance) 0.5 (except in Rebirth)Burning BasementBurning Basement 1 Bomb BumBomb Bum, 3 Rocks and 3 Fire Places in each corner, and 4 random BombBomb pickups. SuperSecretRoom 21
22 (in Repentance) 0.25 BasementBasement 1 ShopkeeperShopkeeper, and 4 Greed GaperGreed Gapers. SuperSecretRoom 22
23 (in Repentance) 0.5 (in Repentance)CorpseCorpse 1 Spiked Rock in each corner, and 3 Rotten HeartRotten Hearts. Only Rotten Hearts can be created in this room, regardless of what item is used to create said Hearts (e.g. V - The HierophantV - The Hierophant will drop 2 Rotten Hearts rather than Soul Hearts). SuperSecretRoom 23
24 (in Repentance) 0.5 ArcadeArcade 5 Micro BatteryMicro Batteries. The middle one has a 50% chance to be a Lil' BatteryLil' Battery. SuperSecretRoom 24
25 (in Repentance) 0.25 (except in Rebirth)Dank DepthsDank Depths 1 pickup which has an 83% chance to be a Golden KeyGolden Key and a 17% chance to be a Golden BombGolden Bomb, surrounded diagonally by 4 Skulls. SuperSecretRoom 25
26 (in Repentance) 0.01 (in Repentance)AshpitAshpit 8 Mushrooms, and 1 lit Giga BombGiga Bomb that explodes shortly after. SuperSecretRoom 26
27 (in Repentance) 1 (in Repentance)CorpseCorpse 1 Rotten BeggarRotten Beggar, and 1 Blood Donation MachineBlood Donation Machine. SuperSecretRoom 27
28 (in Repentance) 0.5 (in Repentance)MausoleumMausoleum 3 Urns in each corner, and 2 Black SackBlack Sacks. SuperSecretRoom 28
29 (in Repentance) 0.25 (in Repentance)GehennaGehenna 4 Spikes, and 1 Golden BatteryGolden Battery. SuperSecretRoom 29
30 (in Repentance) 0.25 ChestChest 1 Mega ChestMega Chest, and 2 random KeyKey pickups. SuperSecretRoom 30
31 (in Repentance) 0.5 CellarCellar 4 Rocks, and 2 Wooden ChestWooden Chests. SuperSecretRoom 31
32 (in Repentance) 1 CathedralCathedral 1 ConfessionalConfessional. SuperSecretRoom 32

(except in Rebirth) Greed Mode Layouts[ | ]

Greed Mode has its own set of Super Secret Room layouts.

ID Weight Room theme Contents Image preview
0 1 WombWomb 5 Red HeartRed Hearts. Only Red Hearts can be created in this room, regardless of what item is used to create said Hearts (e.g. V - The HierophantV - The Hierophant will create 2 Red Hearts rather than Soul Hearts). SuperSecret Greed0
1 1 ArcadeArcade 5 PennyPennies. (in Repentance) One of which can be any type of Coin. SuperSecret Greed1
2 1 CatacombsCatacombs 3 KeyKeys. SuperSecret Greed2
3 1 (except in Rebirth)Burning BasementBurning Basement 3 BombBombs. SuperSecret Greed3
4 1 CathedralCathedral 2 Soul HeartSoul Hearts. Only Soul Hearts can be created in this room, regardless of what item is used to create said Hearts (e.g. VI - The LoversVI - The Lovers will create 2 Soul Hearts rather than Red Hearts). SuperSecret Greed4
5 1 Library 1 Black HeartBlack Heart. Only Black Hearts can be created in this room, regardless of what item is used to create said Hearts (e.g. V - The HierophantV - The Hierophant will create 2 Black Hearts rather than Soul Hearts). SuperSecret Greed5
6 1 ChestChest 1 ChestChest; small chance to spawn another type of Chest instead. SuperSecret Greed6
7 1 ChestChest 1 Bomb ChestBomb Chest. SuperSecret Greed7
8 1 SheolSheol (except in Repentance) 1 Red ChestRed Chest. SuperSecret Greed8 Afterbirth
(in Repentance) 2 Red Chests. SuperSecret Greed8 Repentance
9 1 BasementBasement 4 random Pills. SuperSecret Greed9
10 1 LibraryLibrary 2 random Cards. SuperSecret Greed10
11 1 CellarCellar 4 Lil' BatteryLil' Batteries. (in Repentance) Each battery has a 50% chance to be a Random Battery instead. SuperSecret Greed11
12 1 Dark RoomDark Room 2 random Runes. SuperSecret Greed12
13 1 SheolSheol (except in Repentance) 2 Red ChestRed Chests. SuperSecret Greed8 Repentance
0.5 (in Repentance) 3 Red Chests. SuperSecret Greed13 Repentance
14 1 CellarCellar 2 random trinkets. SuperSecret Greed14
15 (except in Repentance)
1.0
(in Repentance)
0.5
CellarCellar 1 random trinket. SuperSecret Greed15
16 1 Clean BedroomClean Bedroom 1 bed. SuperSecret Greed16
17 1 I AM ERRORI AM ERROR room 1 trapdoor to the next floor. SuperSecret Greed17
18 (except in Repentance)
1
(in Repentance)
0.5
BasementBasement 17 PoopPoops. SuperSecret Greed18
19 (except in Repentance)
1
(in Repentance)
0.25
(except in Rebirth)The ShopThe Shop 1 Golden BombGolden Bomb. SuperSecret Greed19
20 1 (except in Rebirth)The ShopThe Shop 1 Golden PoopGolden Poop. SuperSecret Greed20
21 (except in Repentance)
1
(in Repentance)
0.25
(except in Rebirth)The ShopThe Shop 1 Golden KeyGolden Key. SuperSecret Greed21
22 1 Secret RoomSecret Room (except in Repentance) 1 Greed Mode Treasure Room item.
(in Repentance) 1 Greed Mode Secret Room item.
SuperSecret Greed22
23 1 ChestChest 2 Locked ChestLocked Chests. SuperSecret Greed23
24 1 CathedralCathedral 1 Eternal HeartEternal Heart. Only Eternal Hearts can be created in this room, regardless of what item is used to create said Hearts (e.g. V - The HierophantV - The Hierophant will create 2 Eternal Hearts rather than Soul Hearts). SuperSecret Greed24
25 (except in Repentance)
1
(in Repentance)
0.1
WombWomb 1 Half Red HeartHalf Red Heart. Only Half Red Hearts can be created in this room, regardless of what item is used to create said Hearts (e.g. V - The HierophantV - The Hierophant will create 2 Half Red Hearts rather than Soul Hearts). SuperSecret Greed25
26 (in Repentance) 0.1 ArcadeArcade 1 Golden PennyGolden Penny. SuperSecret Greed26
27 (in Repentance) 0.5 NecropolisNecropolis 1 Greed Mode Secret Room item surrounded by pits and 2 spike rocks that can fill up pits when destroyed from a certain direction. SuperSecret Greed27

(in Repentance) Ultra Secret Rooms[ | ]

Ultra Secret RoomUltra Secret Rooms are special rooms that are not connected to any other room on the map directly. They are not revealed by most mapping effects (Collectible The Mind iconThe Mind, etc.) and can only be revealed on the map with Collectible Cracked Orb iconCracked Orb, Collectible Book of Secrets iconBook of Secrets, wisps, and Rune ShardRune Shard. They can be accessed directly by opening Red RoomRed Rooms adjacent to them using Collectible Red Key iconRed Key or Red Key wisps, Crystal KeyCrystal Key, Cracked KeyCracked Key, and Soul of CainSoul of Cain: entering a Red Room next to the Ultra Secret room will reveal its position and automatically open the doorway leading into it. It can also be entered by teleporting to it using XVIII - The Moon?XVIII - The Moon?; when teleported into, a pathway of Red Rooms back to the rest of the level will be opened automatically. Ultra Secret rooms contain items from the Ultra Secret Room item pool.

Common Ultra Secret Room locations

Common Ultra Secret Room locations

Ultra Secret rooms are most likely generated in spots that connect to 3+ non-red rooms through its adjacent red rooms (different squares in L rooms count as 2). They can be connected to 2 or 1 non-red rooms through its adjacent red rooms, but a specific 3+ room location is 11.5x more likely than a specific 2 room location, and 1 room locations being virtually impossible if there is a 3+ location available. If there is no 3+ room location available then a specific 2 room location is 11.5x more likely than a specific 1 room location.

Ultra Secret Rooms can't be connected to red rooms that connect to Secret Rooms, Super Secret Rooms, or Curse RoomCurse Rooms, and can't be in a location where any of its adjacent red rooms are invalid, such as next to a Boss RoomBoss Room (Boss Rooms in The VoidThe Void can have red rooms next to them, but the Ultra Secret Room will never be connected to one), next to the sides of narrow rooms, or any room that can't have a red room opened on that specific side, however locations on the 13x13 border where a red room would normally open to an I AM ERRORI AM ERROR room are allowed.

Notes[ | ]

  • Generally, the best strategy for finding Ultra Secret Rooms is by checking a location that connects to at least 3 non-red rooms through its adjacent red rooms (in which all sides can have red rooms created, and isn't next to a Secret, Super Secret, or Curse Room), and if it's not in any 3+ locations, checking the spots connected to 2 rooms, then 1.
    • When choosing which side to open from, the best way to increase your odds is to open the red room that connects to the highest number of other potential Ultra Secret Room locations.
      • However, there is also value in choosing to open a red room that connects to an otherwise hard-to-access room, such as a Boss Challenge RoomBoss Challenge Room.
    • If the only remaining valid locations are connected to a single non-red room, it's just as likely for the Ultra Secret Room to be connected to the side of a single room as it is connected to a corner.
  • The doors of the Ultra Secret Room are opened automatically only when approached from the outside. If other rooms exist adjacent to it, the doors will not open from inside the Ultra Secret Room without bombing them or returning from the outside.
    • Red Key or Cracked Keys must be used before the bombs, as otherwise explosions won't have an effect.
  • The Ultra Secret Room can generate north of the Mega Satan door, despite not being able to create a red room there.
  • In the Mirrored World, the Ultra Secret Room will be empty, same as any Special Room.
  • It's possible for the Ultra Secret Room to not generate if there are no valid locations.

Layouts[ | ]

ID Weight Contents Image preview
0 1.0 2 ShopkeeperShopkeepers, 4 PoopPoops behind Key Blocks, some Cobwebs, 2 random KeyKeys, and 1 Ultra Secret Room item. UltraSecretRoom 0
1 1.0 Several Key Blocks and Metal Blocks along the walls, and 1 Ultra Secret Room item. UltraSecretRoom 1
2 1.0 2 Shopkeepers, several Key Blocks, and 1 Ultra Secret Room item. UltraSecretRoom 2
3 1.0 1 Shopkeeper behind Key Blocks, a few Cobwebs, and 1 Ultra Secret Room item blocked off by Key Blocks and Metal Blocks. UltraSecretRoom 3
4 0.75 1 Shopkeeper, a few Cobwebs, and Rocks in the shape of a Key, with 1 Ultra Secret Room item inside the Key's 'loop'. UltraSecretRoom 4
5 0.5 2 Shopkeepers, a few Cobwebs, several Urns, 3 random Coins, and 4 Greed GaperGreed Gapers guarding 1 Ultra Secret Room item. UltraSecretRoom 5
6 0.25 10 Shopkeepers, 2 Fire PlaceFire Places, a Rock, some Cobwebs, and 2 Ultra Secret Room items. UltraSecretRoom 6
7 0.1 2 Shopkeepers, some Cobwebs, a Rock, 10 KeyKeys, and 2 Key RingKey Rings. UltraSecretRoom 7
8 1.0 1 Shopkeeper, some Cobwebs, 1 Key Block in each corner, and an item between some Retractable Spikes. UltraSecretRoom 8

Notes[ | ]

  • 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.
  • One easy strategy to place the bomb correctly in large rooms is to position Isaac in a corner, walk along a wall, then place the bomb at the spot where the camera starts moving.
  • 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 Isaac can place a bomb. Secret Room entrances are never found in front of gaps, obstacles, spikes, or places that enemies spawned when the room was originally entered. Each room adjacent 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.
  • Secret Rooms are equally as likely to be in a valid location with 3 neighbors, as it is with 4 neighbors. 2 neighbor locations are rare but possible, even when there are locations with 3+ neighbors available. 1 neighbor locations can only happen if there are no valid 3+ neighbor locations, and are very rare.
A secret room adjacent to only one room

A secret room adjacent to only one room

  • Collectible X-Ray Vision iconX-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. (in Afterbirth † and Repentance)Collectible Dog Tooth iconDog Tooth will play a howl sound effect when Isaac enters a room adjacent to a Secret Room or Super Secret Room, and (in Afterbirth † and Repentance)Collectible YO LISTEN! iconYO LISTEN! will hover over Secret Room entrances.
  • Teleportation items can randomly teleport Isaac into Secret Rooms, and XVIII - The MoonXVIII - The Moon will always teleport Isaac to the Secret Room.
  • Secret Rooms are revealed on the map with Collectible Blue Map iconBlue Map, Collectible Book of Secrets iconBook of Secrets, Collectible Crystal Ball iconCrystal Ball, Collectible The Mind iconThe Mind, Collectible Spelunker Hat iconSpelunker Hat, XIX - The SunXIX - The Sun, or XXI - The WorldXXI - The World, but Isaac will still need to open their entrance.
  • (in Repentance)Collectible Red Key iconRed Key can be used to find Secret Rooms. The lack of Red door frame means a Secret Room could have generated on the other side.
  • (in Repentance)Collectible Star of Bethlehem iconStar of Bethlehem sometimes reveals Secret Rooms as it can travel through them.
  • If GreedGreed or Super GreedSuper Greed spawn inside a Secret Room, Isaac won't be able to exit it (like a Mini-Boss RoomMini-Boss Room), but once the fight ends, all the exits of the Secret Room will be accessible.
    • An exception to this is that Challenge RoomChallenge Rooms and Boss Challenge RoomBoss Challenge Rooms will be inaccessible; the metal bars won't be removed from walls that lead to them after the fight concludes.
  • Secret Rooms can exist next to all types of rooms except Boss RoomBoss Rooms, Super Secret Rooms, and other Secret Rooms; allowing certain restricted rooms to be entered.
    • Even if Isaac has 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 RoomCurse Rooms without taking damage by bombing in from a Secret Room.
    • It is possible to access Challenge RoomChallenge Rooms even if Isaac doesn'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.
  • (in Repentance) Secret Rooms of all types do not exist in the Ascent.
  • (in Repentance) Once Corrupted Data Corrupted Data is achieved (beating Boss Delirium ingameDelirium as Character Tainted Eden iconTainted Eden), items that spawn in Secret Rooms have a chance to be "glitched" as if affected by Collectible TMTRAINER iconTMTRAINER.
  • 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 RoomBoss Room takes the dead-end room that would require the most rooms walked through, and the ShopShop 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.
    • Sometimes, the Boss Room will not be the furthest dead-end room; usually, in these cases, the Boss Room has one side blocked off and the Super Secret Room will be connected to the furthest normal room, with the wall leading to it being on the opposite side of the blocked off side in the Boss Room.
      • For example, if the blocked off side in the Boss Room is to the north, the Super Secret Room will be to the south of the furthest normal room.
  • Super Secret Rooms can have layouts with themes from floors that Isaac hasn't unlocked yet.

Trivia[ | ]

  • In the original The Binding of Isaac, Secret Rooms worked differently; if the player left a room after opening a Secret Room entrance, the entrance would disappear. To access the room again for any purpose, the player needed another BombBomb to reopen the entrance.
  • Prior to V1.7.5, Ultra Secret Rooms used the Angel Room Item Pool. This was meant as a placeholder.

Bugs[ | ]

Bug Bug! After fighting Greed/Super Greed spawn inside a Secret Room, if there is an adjacent Challenge Room or Boss Challenge Room, the metal bars from the Greed/Super Greed fight will not disappear after the fight has ended, making it impossible to enter the Challenge/Boss Challenge room this way.
Bug Bug! (except in Rebirth) Teleporting to the Super Secret Room in Greed or Greedier Mode, when the room is generated behind a still-locked Treasure Room, can trap Isaac inside.
Bug Bug! (in Repentance) Curse of the MazeCurse of the Maze can move a room in a way that prevents creating a red room that connects to the Ultra Secret Room leading to a softlock.

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