The Binding of Isaac: Wrath of the Lamb/The Catacombs

Introduction
The Catacombs is the alternate version of The Caves, added in the Wrath of the Lamb expansion pack.

However, this level is much harder than its original counterpart.

Rooms
Regular Room

Catacombs 1: 9-12 rooms| Catacombs 2: 11-14 rooms| Catacombs XL: 20-26 rooms

Treasure Room

Catacombs 1: 1 room| Catacombs 2: 1 room| Catacombs XL: 2 rooms

Boss Room

Catacombs 1: 1 room| Catacombs 2: 1 room| Catacombs XL: 2 rooms

Cursed Room

It's possible for this room to appear on any floor.| Note: This door will damage the player for a full heart damage (both entering and exiting).

Arcade Room

It's possible for this room to appear on any floor (except Catacombs 1).| Note: This room will only spawn if the player has at least 5 coins while entering the floor.

Shop

Catacombs 1: 1 room| Catacombs 2: 1 room| Catacombs XL: 1 room| Note: The player can buy items here with coins.

Challenge Room

It's possible for this room to appear on any floor.| Note: This room will only open if the player has full health while entering the floor.

Boss Challenge Room

It's possible for this room to appear on any floor.| Note: This room will only open if the player has one full red heart or less remaining.

Devil Room

This room has a chance to spawn after defeating a boss.| Note: The player can exchange hearts for much better items here.

Angel Room

This room acts similar to the Devil Room. However, it might replace it.| Note: The player can get some effective items here for free.

Secret Room|Super Secret Room

This room is not visible in the map without some specific items. However, the player can reveal it by bombing the middle part of a wall.