Binding of Isaac: Rebirth Wiki
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Binding of Isaac: Rebirth Wiki

The Basement is one of the environments in Chapter 1. Unlocked at the beginning of the game, it is considered the easiest of the environments in the game. The theme of the Basement is flies and poop.

The Basement's harder unlockable variants are Cellar Cellar and the Added in AfterbirthBurning Basement Burning Basement.

After Added in RepentanceA Secret Exit A Secret Exit is unlocked, a locked door similar to the one leading to a Treasure Room will appear in this floor's Boss Room upon defeating the boss leading to Downpour Downpour / Dross Dross. Like a Treasure Room, this door requires a key to be unlocked. Unlike Angel Rooms and Devil Rooms, this door never disappears.

Monsters[]

Entity ID Description
Clotty
Clotty
15.0 Randomly wanders around the room, firing 4 blood shots in the cardinal directions.
Clot
Clot
15.1 Randomly wanders around the room, firing 4 tar shots in the ordinal directions.
I.Blob
I.Blob
15.2 Randomly wanders around the room, firing 8 shots in all directions.
Dip
Dip
217.0 Slowly dashes in random directions, dealing contact damage.
Squirt
Squirt
220.0 Dashes towards Isaac and deals contact damage. Spawns 2 Dips upon death.
Embryo
Embryo
77.0 Aimlessly hops around the room, dealing contact damage.
Fatty
Fatty
208.0 Slowly walks towards Isaac. Occasionally farts, which pushes Isaac and adjacent enemies away.
Pale Fatty
Pale Fatty
208.2 Slowly walks towards Isaac. Occasionally farts and shoots 6 blood shots in all directions. Has a chance to turn into a Blubber or Half Sack upon death.
Blubber
Blubber
210.0 Walks around aimlessly and randomly spews a cluster of blood shots in all directions. Has a chance to turn into a Half Sack when killed.
Fly
Fly
13.0 Hovers in place. Does not deal contact damage and is harmless but can turn into Pooters if they stay around Poop.
Attack Fly
Attack Fly
18.0 Red fly that follows Isaac and deals contact damage.
Ring Fly
Ring Fly
222.0 Gathers with any other Ring Flies in the room. These flies orbit around themselves while following Isaac. Deals contact damage.
Moter
Moter
80.0 Follows Isaac, similar to Attack Flies. Deals contact damage. Splits into 2 Attack Flies upon death.
Pooter
Pooter
14.0 Slowly drifts toward Isaac, occasionally firing a single blood shot at him. Does not deal contact damage.
Super Pooter
Super Pooter
14.1 Slowly drifts toward Isaac, occasionally firing two blood shots in a V-formation at him. Does not deal contact damage.
Level 2 Fly
Level 2 Fly
214.0 Flies toward Isaac erratically, dealing contact damage.
Full Fly
Full Fly
249.0 Flies toward Isaac erratically, dealing contact damage. Releases 6 bullets in all directions upon death.
Sucker
Sucker
61.0 Flies slowly towards Isaac, exploding into 4 shots in the cardinal directions upon death.
Gaper
Gaper
10.1 Walks towards Isaac, dealing contact damage. Usually turns into a Pacer or a Gusher upon death.
Frowning Gaper
Frowning Gaper
10.0 Walks towards Isaac, dealing contact damage. Upon getting near Isaac, it will open its eyes and pursue Isaac faster. Usually turns into a Pacer or a Gusher upon death.
Skinny
Skinny
226.0 Slowly walks towards Isaac, leaving short-lasting Red Creep behind itself.
Hopper
Hopper
29.0 Slowly hops around the room, doing contact damage. Can turn into a Flaming Hopper by jumping into fire.
Flaming Hopper
Flaming Hopper
54.0 Quickly hops around the room, doing contact damage. Covers a larger distance than the regular Hopper.
Horf
Horf
12.0 Stationary enemy that fires a medium-ranged blood shot at Isaac when he gets in range of them.
Psychic Horf
Psychic Horf
248.0 Stationary enemy that fires a homing shot at Isaac when he gets in range of them.
Mulligan
Mulligan
16.0 Walks around the room, avoiding Isaac. Upon death, spawns several flies, which can be Black Flies, Attack Flies, and/or Pooters. Can suicide to explode and launch four projectiles in the cardinal directions while still releasing flies.
Mulligoon
Mulligoon
16.1 Walks around the room, avoiding Isaac. Upon death, spawns a Troll Bomb and fires four shots in the ordinal directions. Can suicide to explode, spawn a Troll bomb, and launch eight projectiles in all directions.
Mulliboom
Mulliboom
16.2 Chases Isaac and explodes upon death or upon touching Isaac. The explosion deals a half-heart of damage instead of the regular full heart.
Nest
Nest
205.0 Wanders around the room, avoiding Isaac and spawning Spiders if he gets close. Spawns a Big Spider or Trite upon death.
Nerve Ending
Nerve Ending
231.0 Static enemy which acts as a meat shield.
Pacer
Pacer
11.1 Walks aimlessly around the room.
Gusher
Gusher
11.0 Walks aimlessly around the room, occasionally firing a short-ranged blood shot.
Round Worm
Round Worm
244.0 Pops out of the ground in random locations and spits a blood shot at Isaac if he is in sight.
Spider
Spider
85.0 Erratically moves around the room. If Isaac gets close to it, it chases him, trying to deal contact damage.
Level 2 Spider
Level 2 Spider
215.0 Crawls around the room erratically, following Isaac and dealing contact damage. Can jump small distances.
Ticking Spider
Ticking Spider
250.0 Crawls around the room erratically, following Isaac and dealing contact damage. Can jump small distances. Explodes upon death.
Baby Long Legs
Baby Long Legs
206.0 Runs away from Isaac and frequently spawns Spiders.
Small Baby Long Legs
Small Baby Long Legs
206.1 Runs away from Isaac and occasionally spawns Sacks.
Crazy Long Legs
Crazy Long Legs
207.0 Chases Isaac, dealing touch damage. Occasionally stops to spit 8 blood shots in all directions.
Small Crazy Long Legs
Small Crazy Long Legs
207.1 Chases Isaac, dealing touch damage. Occasionally stops to spit 4 blood shots in the diagonal directions.
Wall Creep
Wall Creep
240.0 Crawls along walls to try to line up with Isaac and shoots three blood shots in a line.
Blind Creep
Blind Creep
242.0 Randomly crawls along walls and shoots three spread blood shots.
Wall Hugger
Wall Hugger
218.0 Moves around the room like Guts, damaging Isaac by contact. Cannot be destroyed.
Brownie Corn
Brownie Corn
Added in Afterbirth
217.2 Quickly dashes in random directions, dealing contact damage.
Dart Fly
Dart Fly
Added in Afterbirth
256.0 Flies towards Isaac and attempts to predict his movements. Deals contact damage.
Swarm Fly
Swarm Fly
Added in Afterbirth
281.0 Follows Isaac in large, tightly-clustered groups and deals contact damage.
Cyclopia
Cyclopia
Added in Afterbirth
284.0 Walks towards Isaac, dealing contact damage and leaving behind a short-lasting trail of damaging Red Creep. Occasionally shoots a blood shot towards Isaac.
Blue Gaper
Blue Gaper
Added in Afterbirth
297.0 Walks towards Isaac, dealing contact damage.
Greed Gaper
Greed Gaper
Added in Afterbirth
299.0 Walks towards Isaac, dealing contact damage.
Conjoined Fatty
Conjoined Fatty
Added in Afterbirth
257.0 Slowly walks towards Isaac. Occasionally pauses to fart out a line of damaging Green Creep towards Isaac. Chance to turn into a regular Fatty upon death.
Suction Pitfall
Suction Pitfall
Added in Afterbirth
291.2 Invulnerable and stationary enemy which sucks Isaac towards itself. Isaac falls into it when walked over, taking damage and popping back out after a short delay.
Rag Man's Ragling
Rag Man's Ragling
Added in Afterbirth
246.1 Quickly leaps towards Isaac and deals contact damage. Randomly shoots two purple shots that orbit around it.
Roundy
Roundy
Added in Afterbirth
276.0 Pops out of the ground in random locations, creating a small rock wave. Fires an explosive Ipecac shot at Isaac if he is in sight.
Ulcer
Ulcer
Added in Afterbirth
289.0 Pops out of the ground in random locations and spawns a Dart Fly if Isaac is in sight. Fires a blood shot after spawning 6 Dart Flies.
Stoney
Stoney
Added in Afterbirth †
302.0 Chases Isaac and blocks tears, but does not deal contact damage. Temporarily pauses in exhaustion after a certain amount of time. Invulnerable; dies when the room is cleared.
Ministro
Ministro
Added in Afterbirth †
305.0 Hops towards Isaac, occasionally spitting out a cluster of disorganized shots.
Portal
Portal
Added in Afterbirth †
306.0 Spawns various enemies from the current floor until it either vanishes or is killed.
Army Fly
Army Fly
Added in Repentance
868.0 Chases Isaac, moving along the cardinal directions. Forms a line with other Army Flies in the room. Deals contact damage.
Bulb
Bulb
Added in Repentance
61.5 Flies in erratic, angled movements toward Isaac if his active item has charges. Drains active item charges instead of dealing damage.
Degraded Bosses

Bosses[]

Boss Dingle.png
Boss The Duke of Flies.png
Boss Gemini.png
Boss Gurglings.png
Dingle The Duke of Flies Gemini Gurglings
Boss Larry Jr..png
Boss Monstro.png
Boss The Fallen.png
Boss Famine.png
Larry Jr. Monstro The Fallen Requires previous entry into a devil room Famine Needs to be unlocked
Boss The Headless Horseman.png
Boss Steven.png
Boss Dangle.png
Boss Little Horn.png
The Headless Horseman Needs to be unlocked Steven Needs to be unlocked Dangle Added in Afterbirth Needs to be unlocked Little Horn Added in Afterbirth Needs to be unlocked
Boss Rag Man.png
Boss Turdlings.png
Boss Baby Plum.png
Rag Man Added in Afterbirth / Removed in Repentance Needs to be unlocked Turdlings Added in Afterbirth Needs to be unlocked Baby Plum Added in Repentance

Unlockable Achievements[]





  • Basement Boy
    Basement Boy - Beat chapter 1 without taking damage.

Music[]

The music for the Basement is titled Diptera Sonata. Diptera is the order of true flies. Thus, Diptera Sonata literally means "Fly Sonata".

Binding of Isaac: Rebirth OST


SmallIsaac.pngChaptersSmallIsaac.png
Chapter 1 Chapter 2 Chapter 3 Chapter 4 Optional Chapter 5 Chapter 6 Endgame
Normal and hard modes only Stage Basement icon.png Stage Caves icon.png Stage Depths icon.png Stage Womb icon.png Stage Sheol icon.png
Sheol


Stage Cathedral icon.png
Cathedral
Stage Dark Room icon.png
Dark Room


Stage Chest icon.png
The Chest
The Basement The Caves The Depths The Womb
Added in Afterbirth Added in Afterbirth †
Stage Cellar icon.png Stage Catacombs icon.png Stage Necropolis icon.png Stage Utero icon.png ??? Stage The Void icon.png
The Cellar The Catacombs Necropolis Utero ??? The Void
Added in Afterbirth Added in Afterbirth Added in Afterbirth Added in Afterbirth
Stage Burning Basement icon.png Stage Flooded Caves icon.png Stage Dank Depths icon.png Stage Scarred Womb icon.png
Burning Basement Flooded Caves Dank Depths Scarred Womb
Added in Repentance Added in Repentance Added in Repentance Added in Repentance Added in Repentance
Stage Downpour.png Stage Mines icon.png Stage Mausoleum icon.png Stage Corpse icon.png Stage Home icon.png
Downpour Mines Mausoleum Corpse Home
Added in Repentance Added in Repentance Added in Repentance
Stage Dross icon.png Stage Ashpit icon.png Stage Gehenna icon.png
Dross Ashpit Gehenna
Added in Afterbirth
Greed and greedier modes only
Added in Afterbirth Added in Afterbirth
Stage Basement icon.png Stage Caves icon.png Stage Depths icon.png Stage Womb icon.png Stage Sheol icon.png The Shop Ultra Greed
The Basement The Caves The Depths The Womb Sheol The Shop Ultra Greed
The Binding of Isaac: Rebirth The Binding of Isaac: Rebirth The Binding of Isaac: Rebirth
Achievements Achievements Attributes Attributes Bosses Bosses TarotCard.png Cards and Runes Challenges Challenges Chapters Chapters
Characters Characters MainPageBabies.png Co-op Items Items Item pools Item pools Monsters Monsters Objects Objects
Pickups Pickups Pills Pills Rooms Rooms Seeds Seeds Transformations Transformations Trinkets Trinkets