The Binding of Isaac Wiki

The dungeon structure is randomly generated. However, there are some rules when it comes to the generation of a new Floor.

Rooms in the Basic Game[]

Common Room[]


The default type of room has no special symbol on the map, and this type of room makes up the majority of the map. They can have up to four adjacent rooms, which can have any type. Most of them will contain monsters 'indigenous' to the current chapter. Upon clearing such a room, a player might be rewarded with a random pickup or chest that will spawn in the center of the room (unless there's an obstacle like a stone, in which case it will spawn at the nearest free space to the top left).

Aside from the generic monster rooms, there are also some notable types that are still somewhat different: They are mostly void of monsters, and for example present an object like a chest, or a game of chance in the center. As with every common room, it is possible for them to exist multiple times on the same level, since technically speaking they are no special kind of room.


Rooms that will always appear:

 

Icon

Name

Rooms that are always present in the first 3 chapters

Treasure Room

Shop
Secret Room
Boss Room

Rooms of that type added in Wrath of the Lamb

Curse Room

Sacrifice Room
Super Secret Room

Challenge Room (may appear in Sheol)

Arcade

(may appear in Sheol) Mini-Boss Room
Rooms that may occasionally appear

Rooms of that category added in Wrath of the Lamb

Boss Challenge Room

Library

Rooms that need special conditions to be met to appear
Error Room

Devil Room

Rooms of that type added in Wrath of the Lamb

Angel Room

Rooms of that type added in the Eternal edition
Eternal Challenge Room
Rooms
Unlocked Rooms

Boss Room


Curse Room
Wrath of the Lamb DLC


Sacrifice Room
Wrath of the Lamb DLC

Devil Room


Angel Room
Wrath of the Lamb DLC
Locked Rooms


Treasure
Room

Shop

Arcade


Library
Wrath of the Lamb DLC
Hidden Rooms

Secret Room


Super Secret Room
Wrath of the Lamb DLC


I AM ERROR
Wrath of the Lamb DLC
Barred Rooms

Challenge Room



Boss Challenge
Room

Wrath of the Lamb DLC