Wikia

Bosses
Basement	Larry Jr. • Monstro • The Duke of Flies • Gemini • Steven • Famine
Cellar	Widow • Pin • The Duke of Flies • Famine • Gurdy Jr. • The Blighted Ovum
The Caves	Fistula • Peep • Gurdy • Chub • C.H.A.D. • Pestilence
Catacombs	The Husk • The Hollow • The Blighted Ovum • The Carrion Queen • Peep • Pestilence • The Wretched • Gurdy Jr.
The Depths	Loki • Monstro II • Gish • War • Mom
Necropolis	Mask of Infamy • Daddy Long Legs • The Carrion Queen • The Bloat • Loki • War • The Wretched • Mom
The Womb	Scolex • Blastocyst • The Bloat • Death • Conquest • Daddy Long Legs • Triachnid • Teratoma • Mom's Heart • It Lives
Utero	Teratoma • The Bloat • Death • Conquest • Daddy Long Legs • Triachnid • Lokii • Mom's Heart • It Lives
Sheol	The Fallen • Satan
Cathedral	Isaac
The Chest	???
First to fifth and seventh level	The Fallen • Headless Horseman
Devil Room	Krampus

Bosses