Xxx form2Isaac RebirthKeeper sprite


The Catacombs is an alternate chapter added with the Wrath of the Lamb expansion. Its appearance is similar to the Caves, but has pillars and cobwebs on the walls, as well as stones in the ground.


  • 1: The room will always appear once in this floor
  • 2: The room will always appear twice in this floor
  • Possible: There is a chance for this room to appear, usually due to certain criteria being met
  • -: The room cannot appear in this floor.

Rooms from the core game
Rooms Catacombs 1 Catacombs 2 Catacombs XL Note
Regular Rooms 9 - 11 13 - 14 21-25
Treasure room icon Treasure Room 1 1 2
Shop icon Shop 1 1 1 There is always one shop, even in XL floors.
Secret room icon Secret Room 1 1 1
BossRoomIcon Boss Room 1 1 2 Boss Rooms are always linked in XL floors.
Challegne room icon Challenge Room Possible Possible Possible Will only be generated if Isaac has full health while entering the floor.
Arcade icon Arcade Possible Possible Possible Only generated when Isaac has 5 Coins upon entering a new floor or part.
Super secret room icon Devil Room Possible Possible Possible
Super secret room icon I AM ERROR Possible Possible Possible Only reachable by using the Telepills, which have a 6.66% chance to teleport Isaac to this room.
Rooms with Wrath of the Lamb
Rooms Catacombs 1 Catacombs 2 Catacombs XL Note
Super secret room icon Super Secret Room 1 1 1
Curse room icon Curse Room Possible Possible Possible
Sacrifice room icon Sacrifice Room Possible Possible Possible
Angel room icon Angel Room Possible Possible Possible
Libary icon Library Possible Possible Possible 5% base chance to spawn, 25% if Isaac is holding a book.
Boss challenge room Boss Challenge Room Possible Possible Possible


Monster Description WotL DLC
Eternal Fly
White fly
Invulnerable Fly that circles Corny PoopNuttypoop, Holy LeechesHoly leech or HangersHang man.
Fat Fly
Alternate version of PootersPouter. Fires 2 shots in a V-formation and does not deal touch damage.
Red Boom Fly
Flies around the room diagonally, dealing touch damage and exploding into 6 directional blood shots upon death.
Black spider
Moves erratically around the room, damaging Isaac by touch.
Big Spider
Big spider
Moves erratically around the room, splitting into two SpidersBlack spider upon death.
Spider hopper
Quickly jumps towards Isaac with high distance.
Green boil
Stationary enemy that shrinks upon being hit. Will quickly swell up if not killed in time. Fires an IPECAC shot at Isaac when fully swollen.
White boil
Stationary enemy that shrinks upon being hit. Swells up slower than Guts and Boils. Spawns a SpiderBlack spider when fully swollen.
Walking Boil
Walking boil
Mobile Boil that cannot shrink, but has a finite amount of health. Fires short-ranged blood shots with varying sizes at a reduced fire rate.
Walking Gut
Walking green boil
Mobile Gut that cannot shrink, but has a finite amount of health. Fires IPECAC shots at a reduced fire rate.
Walking Sack
Walking cocoon
Mobile Sack that cannot shrink, but has a finite amount of health. Spawns SpidersBlack spider.
Slowly walks towards Isaac, firing short-ranged IPECAC shots at him. Has much more health than regular Gapers.
Moves erratically around the room. Can only be damaged from behind.
Moves around the room, firing 4 tar shots in an X pattern.
B. Licker
Attaches itself to other B. Lickers, erratically moving around the room, similar to Larry Jr.
Chubby Vis
Fires a Little Chubby-like familiar that deals one heart of damage when Isaac gets in its line of sight.
Hops around the room, firing 2 blood shots in a V formation at Isaac.
Red Host
Stationary enemy that can be damaged even when its head is lowered. Fires 5 blood shots instead of 3 when rising, and fires more frequently.
Bosses found in normal rooms:
Floats around the room diagonally, splitting into smaller, faster versions every time it takes damage. Smallest versions spawn a Charger when killed.




  • In real life, Catacombs are human-made subterranean passageways for religious practice.

Normal & Hard Mode
Chapter 1
The BasementThe CellarBurning Basement
Chapter 2
The CavesThe CatacombsFlooded Caves
Chapter 3
The DepthsNecropolisDank Depths
Chapter 4
The WombUteroScarred Womb
Chapter 5
SheolCathedralBlue Womb
Chapter 6
The Dark RoomThe ChestThe Void
Greed & Greedier Mode
The BasementThe CavesThe DepthsThe WombSheolThe ShopUltra Greed
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