It generally features harder versions of enemies from The Depths. Necropolis is an alternative form of The Depths. The Catacombs contain tougher enemies than the Caves, such as Keepers and B.

The Catacombs replaces The Caves in a similar fashion to how The Cellar can replace The Basement. The Cellar's enemies/bosses are arguably harder than that of the Basement's, making it a challenge for newer players.

Areas of webbing appear in the terrain which slow Isaac's movement and the speed of tears that pass through. The enemies differ from those appearing in the Basement, featuring an increase in the number of Spider-themed Enemies. The Cellar is an alternative version of The Basement which can randomly replace one or both Basement levels in a playthrough. What they are and their unlock requirements can be found on the Secrets page. What they are and their unlock requirements can be found on the Achievements page.ģ4 Secrets were added with the Wrath of the Lamb DLC. 47 achievements (originally 24) were added with the Wrath of the Lamb DLC.

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