The Basement is the first floor in The Binding of Isaac, which takes the appearance of an unfinished basement, that possibly has brick walls. The monsters "Indigenous" to the chapter are flies.
Number of roomsEdit
Basement 1: 9-11 rooms
Basement XL: ?? -26 with 2 boss and item rooms
Basement 2: 13-14 rooms
(TODO: Confirm range [Progress: Possibly 50%> ] )
Bosses found in normal rooms:
List of Bosses
- Larry Jr.
- The Duke of Flies
- Steven (once unlocked)
- Famine (once unlocked)
- The Headless Horseman (once unlocked)
See the The Basement/Room Layouts page for details
- Locked treasure rooms cannot spawn on Basement 1 unless it is the XL version of it.
- A Challenge Room or Boss Challenge Room cannot spawn on Basement 1
- A devil room or Angel Room cannot spawn on The Basement 1, but you can teleport there.
- An arcade cannot spawn on The Basement 1
- In Isaac's Last Will, it will say, "I was killed by this thing in some Basement".
|1||Basement · Cellar|
|2||The Caves · Catacombs|
|3||The Depths · Necropolis|
|4||The Womb · Utero|
|5||Sheol · Cathedral|