Secret Room

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Secret Room Door.png 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 Shopkeeper.pngShopkeeper. 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 Shopkeeper.pngShopkeeper, 2 Fire Place.pngFire Places, and 1 Secret Room item. SecretRoom 0.png
1 1.0 1 Shopkeeper, 2 Fire Places, and 3 random Coins. SecretRoom 1.png
2 1.0 1 Shopkeeper, 2 Fire Places, 4 Rocks and 6 random Coins. SecretRoom 2.png
3 1.0 1 Shopkeeper, 2 Fire Places, 4 Rocks, and 9 random Coins. SecretRoom 3.png
4 1.0 1 Shopkeeper, 4 Rocks, and 1 Slot Machine.pngSlot Machine. SecretRoom 4.png
5 1.0 1 Shopkeeper, 5 Mushrooms, 4 Cobwebs, and 3 random Pickups. SecretRoom 5.png
6 1.0 1 Shopkeeper, 2 TNT.pngTNT, 4 Rocks, and 1 Chest.pngChest. SecretRoom 6.png
7 1.0 1 Shopkeeper, 2 Mushrooms, and 3 random Pills. SecretRoom 7.png
8 1.0 1 Shopkeeper surrounded by 4 Cobwebs, and 3 random Coins. SecretRoom 8.png
9 1.0 1 Shopkeeper, 2 Fire Places, 4 Rocks in each corner, and 3 random Bomb.pngBomb pickups. SecretRoom 9.png
10 (except in Repentance and Repentance+)
1.0
(in Repentance and Repentance+)
0.75
1 Shopkeeper, 2 Fire Places, 2 Red Fire Places, and a Lil' Battery.pngLil' Battery. SecretRoom 10.png
11 1.0 1 Shopkeeper, and 2 random Key.pngKey pickups. SecretRoom 11.png
12 1.0 4 Shopkeepers, 1 Red Fire Place, and 2 random Bomb pickups. SecretRoom 12.png
13 1.0 1 Key Master.pngKey Master, 2 Mushrooms, and 1 random Key pickup.
(except in Repentance and Repentance+) This is the only Secret Room that doesn't have a Shopkeeper.
SecretRoom 13.png
14 (except in Repentance and Repentance+)
1.0
(in Repentance and Repentance+)
0.5
3 Shopkeepers, and 1 Golden Poop.pngGolden Poop. SecretRoom 14.png
15 1.0 1 Shopkeeper, 20 Mushrooms, and 1 Double Bomb.pngDouble Bomb. SecretRoom 15.png
16 (except in Rebirth) (except in Repentance and Repentance+)
1.0
(in Repentance and Repentance+)
0.25
1 Shopkeeper, 2 Fire Places, and 1 Corny Poop. SecretRoom 16.png
17 (except in Rebirth) (except in Repentance and Repentance+)
1.0
(in Repentance and Repentance+)
0.25
1 Shopkeeper, 2 Fire Places, 2 Rocks, and 2 Reward Plate.pngReward Plates. SecretRoom 17.png
18 (except in Rebirth) 1.0 1 Shopkeeper, 2 Fire Places, 20 Cobwebs, 4 Spider.pngSpiders, and 4 random pickups. SecretRoom 18.png
19 (except in Rebirth) (except in Repentance and Repentance+)
1.0
(in Repentance and 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.png
20 (except in Rebirth) (except in Repentance and Repentance+)
1.0
(in Repentance and Repentance+)
0.25
1 Shopkeeper, 2 Fire Places, and 1 Reward Plate. SecretRoom 20.png
21 (except in Rebirth and Afterbirth) 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 Chest.pngLocked Chests, (except in Rebirth) Grab Bag.pngGrab Bags, Secret Room items, and/or random pickups. SecretRoom 21.png
22 (except in Rebirth and Afterbirth) 1.0 3 Shopkeepers, 2 Fire Places, and 1 Nickel.pngNickel. SecretRoom 22.png
23 (except in Rebirth and Afterbirth) (except in Repentance and Repentance+)
1.0
(in Repentance and Repentance+)
0.5
1 Shopkeeper, 2 Fire Places, 1 Grab Bag, and 1 Shop Restock Machine.pngShop Restock Machine. SecretRoom 23.png
24 (except in Rebirth and Afterbirth) (except in Repentance and Repentance+)
1.0
(in Repentance and Repentance+)
0.25
1 Shopkeeper, 2 Blocks, and 10 Mushrooms. SecretRoom 24.png
25 (except in Rebirth and Afterbirth) (except in Repentance and Repentance+)
1.0
(in Repentance and Repentance+)
0.5
1 Shopkeeper, 2 Fire Places, and 2 Grab Bags. SecretRoom 25.png
26 (except in Rebirth and Afterbirth) (except in Repentance and Repentance+)
1.0
(in Repentance and Repentance+)
0.5
1 Shopkeeper, 2 Fire Places, 2 Poops, 6 Mushrooms, and 1 Troll Bomb.pngTroll Bomb which will blow up 3 of the Mushrooms and the Shopkeeper. SecretRoom 26.png
27 (except in Rebirth and Afterbirth) (except in Repentance and Repentance+)
1.0
(in Repentance and Repentance+)
0.25
1 Shopkeeper, 2 Fire Places, and 2 Reward Plate.pngReward Plates. SecretRoom 27.png
28 (except in Rebirth and Afterbirth) 0.1 1 Shopkeeper, 2 Fire Places, 2 Chest.pngChests, 1 Poop surrounded by 3 Fly.pngFlies, and 1 Secret Room item. SecretRoom 28.png
29 (except in Rebirth and Afterbirth) 0.1 5 Shopkeepers, and 1 Secret Room item behind 4 Blocks and 4 Purple Fire Places. SecretRoom 29.png
30 (in Repentance and Repentance+) 0.1 1 Shopkeeper, 2 Fire Places, 2 Poops, and 1 Mega Battery.pngMega Battery. SecretRoom 30.png
31 (in Repentance and Repentance+) 0.25 1 Shopkeeper, 4 Fire Places, 44 Rocks, and 1 Rainbow Poop.pngRainbow Poop. SecretRoom 31.png
32 (in Repentance and Repentance+) 1 1 Shopkeeper, 2 Poops, 10 Mushrooms, and 5 random Coins. SecretRoom 32.png
33 (in Repentance and Repentance+) 0.5 2 Shopkeepers, 4 Fire Places, 2 Rocks, and 3 Mushrooms and 1 rock which surround 1 random Card. SecretRoom 33.png
34 (in Repentance and 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.png
35 (in Repentance and Repentance+) 1 1 Shopkeeper, 3 random Coins, along with 1 Chest.pngChest and 1 Locked Chest.pngLocked Chest each in the upper corners that are both blocked by 2 Spiked Rocks. SecretRoom 35.png
36 (in Repentance and 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 TNT.pngTNT which is itself behind Spikes on each side. SecretRoom 36.png
37 (in Repentance and Repentance+) 0.5 One Rotten Beggar.pngRotten Beggar, 4 Mushrooms, and 3 random Coins. SecretRoom 37.png
38 (in Repentance and Repentance+) 0.5 1 Shopkeeper, 2 Fire Places, 1 Block in each corner, and 1 Wooden Chest.pngWooden Chest. SecretRoom 38.png

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

(in Repentance and 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.png

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 Heart.pngRed 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.png
1 1 CathedralCathedral 1 Eternal Heart.pngEternal 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.png
2 1 SheolSheol 1 Red Chest.pngRed Chest. SuperSecretRoom 2.png
3 1 NecropolisNecropolis 1 Fortune Telling Machine.pngFortune Telling Machine. SuperSecretRoom 3.png
4 1 CellarCellar 1 random trinket. SuperSecretRoom 4.png
5 1 BasementBasement 5 random Pills. SuperSecretRoom 5.png
6 (in Rebirth) 1 (in Rebirth) Dark RoomDark Room 1 Black Heart.pngBlack 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.png
(except in Rebirth) 0.5 (except in Rebirth) LibraryLibrary SuperSecretRoom 6.png
7 (except in Rebirth) (in Rebirth and Afterbirth)
1
(in Afterbirth †)
0.25
(in Repentance and Repentance+)
0.1
Dark RoomDark Room 1 Nulls.pngNulls in each corner, and 5 random Runes. SuperSecretRoom 7 Afterbirth.png
8 (except in Rebirth) (except in Repentance and Repentance+)
1
(in Repentance and Repentance+)
0.5
(except in Rebirth)Burning BasementBurning Basement 1 Shopkeeper.pngShopkeeper, 2 Bomb Chest.pngBomb Chests, 3 TNT.pngTNT, 13 Fire Place.pngFire Places, and 5 Red Fire Place.pngRed Fire Places.
(in Repentance and Repentance+) All Fire Places in the room will be extinguished if this room appears in (in Repentance and Repentance+)DownpourDownpour or (in Repentance and Repentance+)DrossDross.
SuperSecretRoom 8.png
9 (except in Rebirth) (except in Repentance and Repentance+)
1
(in Repentance and Repentance+)
0.1
(except in Rebirth)Flooded CavesFlooded Caves 1 Black Poop.pngBlack Poop surrounded by 6 retracting Spikes. SuperSecretRoom 9.png
10 (except in Rebirth) (in Rebirth and Afterbirth)
1
(in Afterbirth †)
0.25
(in Repentance and Repentance+)
0.5
I AM ERRORI AM ERROR room Can contain any of the following: Mom's Hand.pngMom's Hand, Boss Rag Man ingame.pngRag Man, random pickups, Chest.pngChests, Cards, trinkets, Pills, and/or items. SuperSecretRoom 10.png
11 (except in Rebirth and Afterbirth) 1 WombWomb 4 Red Poop.pngRed Poops, and 3 Double Heart.pngDouble Hearts. SuperSecretRoom 11.png
12 (except in Rebirth and Afterbirth) 0.1 CathedralCathedral 3 Soul Heart.pngSoul Hearts, 2 Blue Fire Place.pngBlue 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.png
13 (except in Rebirth and Afterbirth) 0.1 SheolSheol 3 Black Heart.pngBlack Hearts, and 2 Black Globin's Head.pngBlack 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.png
14 (except in Rebirth and Afterbirth) 1 ShopShop 1 Beggar.pngBeggar, and 1 Blood Donation Machine.pngBlood Donation Machine. SuperSecretRoom 14.png
15 (except in Rebirth and Afterbirth) 0.1 (except in Repentance and Repentance+) WombWomb 1 Red Poop surrounded by 3 Fly.pngFlies, and a random number of various types Red Heart.pngRed Hearts, except Double Heart.pngDouble Hearts. SuperSecretRoom 15.png
(in Repentance and Repentance+) (except in Rebirth)Scarred WombScarred Womb SuperSecretRoom 15 Repentance.png
16 (except in Rebirth and Afterbirth) 0.1 CathedralCathedral 1 Rainbow Poop.pngRainbow Poop surrounded by 3 Fly.pngFlies, and 2 Eternal Heart.pngEternal 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.png
17 (except in Rebirth and Afterbirth) 0.1 SheolSheol 1 (except in Rebirth) Black Poop.pngBlack Poop surrounded by 3 Fly.pngFlies, and 6 Red Chest.pngRed Chests. SuperSecretRoom 17.png
18 (except in Rebirth and Afterbirth) 0.1 ShopShop 2 Fortune Telling Machine.pngFortune Telling Machines and 3 Slot Machine.pngSlot Machines. SuperSecretRoom 18.png
19 (except in Rebirth and Afterbirth) 0.1 BasementBasement 1 Red Poop.pngRed Poop surrounded by 3 Fly.pngFlies, and 9 random Pills. SuperSecretRoom 19.png
20 (in Repentance and Repentance+) 0.5 LibraryLibrary 1 Battery Bum.pngBattery Bum, 4 Urns, 2 Cobwebs, and 3 random Coins. SuperSecretRoom 20.png
21 (in Repentance and Repentance+) 0.5 (except in Rebirth)Burning BasementBurning Basement 1 Bomb Bum.pngBomb Bum, 3 Rocks and 3 Fire Places in each corner, and 4 random Bomb.pngBomb pickups. SuperSecretRoom 21.png
22 (in Repentance and Repentance+) 0.25 BasementBasement 1 Shopkeeper.pngShopkeeper, and 4 Greed Gaper.pngGreed Gapers. SuperSecretRoom 22.png
23 (in Repentance and Repentance+) 0.5 (in Repentance and Repentance+)CorpseCorpse 1 Spiked Rock in each corner, and 3 Rotten Heart.pngRotten 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.png
24 (in Repentance and Repentance+) 0.5 ArcadeArcade 5 Micro Battery.pngMicro Batteries. The middle one has a 50% chance to be a Lil' Battery.pngLil' Battery. SuperSecretRoom 24.png
25 (in Repentance and Repentance+) 0.25 (except in Rebirth)Dank DepthsDank Depths 1 pickup which has an 83% chance to be a Golden Key.pngGolden Key and a 17% chance to be a Golden Bomb.pngGolden Bomb, surrounded diagonally by 4 Skulls. SuperSecretRoom 25.png
26 (in Repentance and Repentance+) 0.01 (in Repentance and Repentance+)AshpitAshpit 8 Mushrooms, and 1 lit Giga Bomb.pngGiga Bomb that explodes shortly after. SuperSecretRoom 26.png
27 (in Repentance and Repentance+) 1 (in Repentance and Repentance+)CorpseCorpse 1 Rotten Beggar.pngRotten Beggar, and 1 Blood Donation Machine.pngBlood Donation Machine. SuperSecretRoom 27.png
28 (in Repentance and Repentance+) 0.5 (in Repentance and Repentance+)MausoleumMausoleum 3 Urns in each corner, and 2 Black Sack.pngBlack Sacks. SuperSecretRoom 28.png
29 (in Repentance and Repentance+) 0.25 (in Repentance and Repentance+)GehennaGehenna 4 Spikes, and 1 Golden Battery.pngGolden Battery. SuperSecretRoom 29.png
30 (in Repentance and Repentance+) 0.25 ChestChest 1 Mega Chest.pngMega Chest, and 2 random Key.pngKey pickups. SuperSecretRoom 30.png
31 (in Repentance and Repentance+) 0.5 CellarCellar 4 Rocks, and 2 Wooden Chest.pngWooden Chests. SuperSecretRoom 31.png
32 (in Repentance and Repentance+) 1 CathedralCathedral 1 Confessional.pngConfessional. SuperSecretRoom 32.png

(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 Heart.pngRed 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.png
1 1 ArcadeArcade 5 Penny.pngPennies. (in Repentance and Repentance+) One of which can be any type of Coin. SuperSecret Greed1.png
2 1 CatacombsCatacombs 3 Key.pngKeys. SuperSecret Greed2.png
3 1 (except in Rebirth)Burning BasementBurning Basement 3 Bomb.pngBombs. SuperSecret Greed3.png
4 1 CathedralCathedral 2 Soul Heart.pngSoul 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.png
5 1 Library 1 Black Heart.pngBlack 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.png
6 1 ChestChest 1 Chest.pngChest; small chance to spawn another type of Chest instead. SuperSecret Greed6.png
7 1 ChestChest 1 Bomb Chest.pngBomb Chest. SuperSecret Greed7.png
8 1 SheolSheol (except in Repentance and Repentance+) 1 Red Chest.pngRed Chest. SuperSecret Greed8 Afterbirth.png
(in Repentance and Repentance+) 2 Red Chests. SuperSecret Greed8 Repentance.png
9 1 BasementBasement 4 random Pills. SuperSecret Greed9.png
10 1 LibraryLibrary 2 random Cards. SuperSecret Greed10.png
11 1 CellarCellar 4 Lil' Battery.pngLil' Batteries. (in Repentance and Repentance+) Each battery has a 50% chance to be a Random Battery instead. SuperSecret Greed11.png
12 1 Dark RoomDark Room 2 random Runes. SuperSecret Greed12.png
13 1 SheolSheol (except in Repentance and Repentance+) 2 Red Chest.pngRed Chests. SuperSecret Greed8 Repentance.png
0.5 (in Repentance and Repentance+) 3 Red Chests. SuperSecret Greed13 Repentance.png
14 1 CellarCellar 2 random trinkets. SuperSecret Greed14.png
15 (except in Repentance and Repentance+)
1.0
(in Repentance and Repentance+)
0.5
CellarCellar 1 random trinket. SuperSecret Greed15.png
16 1 Clean BedroomClean Bedroom 1 bed. SuperSecret Greed16.png
17 1 I AM ERRORI AM ERROR room 1 trapdoor to the next floor. SuperSecret Greed17.png
18 (except in Repentance and Repentance+)
1
(in Repentance and Repentance+)
0.5
BasementBasement 17 Poop.pngPoops. SuperSecret Greed18.png
19 (except in Repentance and Repentance+)
1
(in Repentance and Repentance+)
0.25
(except in Rebirth)The ShopThe Shop 1 Golden Bomb.pngGolden Bomb. SuperSecret Greed19.png
20 1 (except in Rebirth)The ShopThe Shop 1 Golden Poop.pngGolden Poop. SuperSecret Greed20.png
21 (except in Repentance and Repentance+)
1
(in Repentance and Repentance+)
0.25
(except in Rebirth)The ShopThe Shop 1 Golden Key.pngGolden Key. SuperSecret Greed21.png
22 1 Secret RoomSecret Room (except in Repentance and Repentance+) 1 Greed Mode Treasure Room item.
(in Repentance and Repentance+) 1 Greed Mode Secret Room item.
SuperSecret Greed22.png
23 1 ChestChest 2 Locked Chest.pngLocked Chests. SuperSecret Greed23.png
24 1 CathedralCathedral 1 Eternal Heart.pngEternal 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.png
25 (except in Repentance and Repentance+)
1
(in Repentance and Repentance+)
0.1
WombWomb 1 Half Red Heart.pngHalf 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.png
26 (in Repentance and Repentance+) 0.1 ArcadeArcade 1 Golden Penny.pngGolden Penny. SuperSecret Greed26.png
27 (in Repentance and 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.png

(in Repentance and 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 icon.pngThe Mind, etc.) and can only be revealed on the map with Collectible Cracked Orb icon.pngCracked Orb, Collectible Book of Secrets icon.pngBook of Secrets, wisps, and Rune ShardRune Shard. They can be accessed directly by opening Red RoomRed Rooms adjacent to them using Collectible Red Key icon.pngRed 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 Shopkeeper.pngShopkeepers, 4 Poop.pngPoops behind Key Blocks, some Cobwebs, 2 random Key.pngKeys, and 1 Ultra Secret Room item. UltraSecretRoom 0.png
1 1.0 Several Key Blocks and Metal Blocks along the walls, and 1 Ultra Secret Room item. UltraSecretRoom 1.png
2 1.0 2 Shopkeepers, several Key Blocks, and 1 Ultra Secret Room item. UltraSecretRoom 2.png
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.png
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.png
5 0.5 2 Shopkeepers, a few Cobwebs, several Urns, 3 random Coins, and 4 Greed Gaper.pngGreed Gapers guarding 1 Ultra Secret Room item. UltraSecretRoom 5.png
6 0.25 10 Shopkeepers, 2 Fire Place.pngFire Places, a Rock, some Cobwebs, and 2 Ultra Secret Room items. UltraSecretRoom 6.png
7 0.1 2 Shopkeepers, some Cobwebs, a Rock, 10 Key.pngKeys, and 2 Key Ring.pngKey Rings. UltraSecretRoom 7.png
8 1.0 1 Shopkeeper, some Cobwebs, 1 Key Block in each corner, and an item between some Retractable Spikes. UltraSecretRoom 8.png

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 icon.pngX-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. (except in Rebirth and Afterbirth)Collectible Dog Tooth icon.pngDog Tooth will play a howl sound effect when Isaac enters a room adjacent to a Secret Room or Super Secret Room, and (except in Rebirth and Afterbirth)Collectible YO LISTEN! icon.pngYO 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 icon.pngBlue Map, Collectible Book of Secrets icon.pngBook of Secrets, Collectible Crystal Ball icon.pngCrystal Ball, Collectible The Mind icon.pngThe Mind, Collectible Spelunker Hat icon.pngSpelunker Hat, XIX - The SunXIX - The Sun, or XXI - The WorldXXI - The World, but Isaac will still need to open their entrance.
  • (in Repentance and Repentance+)Collectible Red Key icon.pngRed 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 and Repentance+)Collectible Star of Bethlehem icon.pngStar of Bethlehem sometimes reveals Secret Rooms as it can travel through them.
  • If Greed.pngGreed or Super Greed.pngSuper 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 and Repentance+) Secret Rooms of all types do not exist in the Ascent.
  • (in Repentance and Repentance+) Once Corrupted Data Corrupted Data is achieved (beating Boss Delirium ingame.pngDelirium as Character Tainted Eden icon.pngTainted Eden), items that spawn in Secret Rooms have a chance to be "glitched" as if affected by Collectible TMTRAINER icon.pngTMTRAINER.
  • 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 Bomb.pngBomb 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 and Repentance+) Curse of the Maze.pngCurse 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.

References