The Basement is the first floor of Chapter 1 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.
Rooms[]
- 1: The room will always appear once in this floor
- 2: The room will always appear twice in this floor
- Possible: There is a chance for this room to appear, usually due to certain criteria being met
- *: This room can only appear due to a bug or special item
- -: The room cannot appear in this floor
Rooms with the core game | ||||
Rooms | Basement 1 | Basement 2 | Basement XL | Note |
---|---|---|---|---|
Regular Rooms | 7 - 11 | 13 - 14 | 21-25 | The player must have Wrath of the Lamb installed for The Basement XL to appear. |
Treasure Room | 1 | 1 | 2 | |
Shop | 1 | 1 | 1 | There is always one shop (except in The Womb / Utero), even in XL floors. |
Secret Room | 1 | 1 | 1 | |
Boss Room | 1 | 1 | 2 | Boss Rooms are always linked in XL floors. |
Challenge Room | Possible | Possible | Possible | Will only be generated if Isaac has full health while entering the floor. |
Arcade | - | Possible | - | Only generated when Isaac has 5 or more Coins upon entering a new floor or part. |
Devil Room | * | Possible | Possible | *Only reachable by The Joker card. |
I AM ERROR | Possible | Possible | Possible | Only reachable by using the Telepills, which have a 6.66% chance to teleport Isaac to this room. |
Rooms with Wrath of the Lamb | ||||
Rooms | Basement 1 | Basement 2 | Basement XL | Note |
Super Secret Room | 1 | 1 | 1 | |
Curse Room | Possible | Possible | Possible | |
Sacrifice Room | Possible | Possible | Possible | |
Angel Room | * | Possible | Possible | *Only reachable by The Joker card. |
Library | Possible | Possible | Possible | 5% base chance to spawn, 25% if Isaac is holding a book. |
Boss Challenge Room | * | Possible | Possible | Can spawn on The Basement 1, probably due to a bug. |
Monsters[]
Monster | Description | WotL DLC | |
---|---|---|---|
Black Fly |
Tiny black flies that do not hurt Isaac upon touch. | ||
Attack Fly |
Red Flies that follow Isaac and deal touch damage. | ||
Moter |
Follows Isaac, similar to Attack Flies. Will split into 2 Attack Flies upon death. | ||
Eternal Fly |
Invulnerable Fly that sticks to corny poop , Holy Leeches , Hangmans , Psychic Maws , rarely Mr. Maws and very rarely Maws . | ✔ | |
Pooter |
Moves slowly around, shooting 1 projectile at Isaac when he gets near. | ||
Sucker |
Flies slowly towards Isaac, exploding into 4 projectiles in a + formation upon death. | ||
Mulligan |
Harmless enemy that walks around the room, avoiding Isaac. Will spawn multiple flies upon death. | ||
Mulligoon |
Harmless enemy that walks around the room, avoiding Isaac. Will drop a Troll Bomb upon death. | ||
Hopper |
Jumps around the room slowly, damaging Isaac by touch. | ||
Flaming Hopper |
Jumps around the room quickly, covering a large distance, similar to Trites. | ||
Pacer |
Walks aimlessly around the room. Usually spawned after killing a Gaper/Frowning Gaper. | ||
Gusher |
Walks aimlessly around the room, firing extremely short-ranged blood projectiles from its head. Usually spawned after killing a Gaper/Frowning Gaper. | ||
Gaper |
Walks towards Isaac, dealing contact damage. Usually turns into a Pacer or Gusher upon death. | ||
Frowning Gaper |
Walks towards Isaac, dealing contact damage. Usually turns into a Pacer or Gusher upon death. | ||
Horf |
Stationary enemy that fires medium ranged blood shots at Isaac. | ||
Clotty |
Moves around the room, firing 4 blood shots in a plus pattern. | ||
Clot |
Moves around the room, firing 4 tar shots in an X pattern. | ||
I. Blob |
Moves around the room, firing 8 shots in all directions. | ✔ | |
Bosses found in normal rooms: | |||
Embryo |
Aimlessly hops around the room, damaging Isaac by contact damage. |
Bosses[]
Notes[]
- Locked treasure rooms cannot spawn on Basement 1 unless it is the XL version of it.
- A Challenge Room cannot spawn on Basement 1. However, Boss Challenge Rooms can.
- 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.
- There will be no tutorial if you spawned in a XL floor.
Room-layouts[]
Related Achievements[]
The Radioactive Spider - Complete The Basement once.
Monstro's Tooth - Defeat all of the bosses in The Basement. (Duke of Flies, Monstro, Gemini, Larry Jr.)
Basement Boy - Complete The Basement without taking damage.
Chapters | |||||
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Chapter 1 | Chapter 2 | Chapter 3 | Chapter 4 | Chapter 5 | Chapter 6 |
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