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Boom Fly

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IsaacHDIsaac Rebirth

Boom Flies are round flies appearing in The Binding of Isaac and the Rebirth remake. They are large flies with small wings and large, beady eyes. They are mainly found in The Caves and The Depths.


Boom Flies are much larger than normal Flies. Rather than trying to follow Isaac, they will instead fly around the room diagonally, bouncing off walls. They still deal contact damage. They have considerable health, taking at least 6 initial tears to go down. They explode upon death, typically killing all other monsters and dealing a full heart of damage in a small radius.

With a correct timing, they can be used to destroy Rocks or open up Secret Rooms.

When fighting a Boom Fly, it is advised to keep Isaac's distance from it and maintain considerable range; if he stay too close to it when he kill it, it will explode and deal damage to Isaac. Due to this, fighting a Boom Fly when the player has very low range is quite risky.


  • The Skatole item slows down Boom Flies and Red Boom Flies drastically, but they will still explode on death and can damage Isaac.
  • They can be spawned by the blue champion variant of Fistula.


  • Boom Flies' eyes are larger from the original game. In Rebirth, however, their eyes are smaller.


  • If Isaac collected Bob's Curse and kill a Boom Fly after (at any given time), the Boom Fly's explosion will be green, and its the same for all the Boom Flies he encounter after picking up Bob's Curse. Does not apply for Red Boom Flies.
Normal monsters
I Blob-button

I. Blob
More monsters coming soon...
Flies Black FlyAttack FlyMoterEternal FlyPooterFat FlyBoom FlyRed Boom FlyDrowned Boom FlySuckerSpitDart FlySwarm FlyRing FlyLevel 2 FlyFull FlyHush FlyBall of Flies
Spiders SpiderBig SpiderTriteRaglingRag TriteLevel 2 SpiderTicking SpiderBaby Long LegsCrazy Long LegsWall CreepBlind CreepRage Creep
Spheres BoilGutSackBlue BoilWalking Variants
Mulligans MulliganMulligoonMulliboomHiveSwarmerNestDrowned Hive
Headless HopperFlaming HopperLeaperPacerGusherSplasher
Gapers GaperFrowning GaperGurgleMr. MawFlaming GaperCyclopiaSkinnyRottyNullGreed GaperBlue GaperSwinger
Heads HorfPsychic HorfMawRed MawPsychic Maw
Globins GlobinGazing GlobinBlack GlobinDank Globin
Knights KnightSelfless KnightFloating KnightBone Knight
Blobs ClottyClotMega Clotty
Maggots MaggotChargerSpittyConjoined SpittyDrowned ChargerGrub
Body parts Mask + HeartBrainMemBrainGutsMama GutsEyeBloodshot EyeMom's HandDead Mom's HandScarred GutsNerve EndingStone Eye
Worms Para-BiteCod WormScarred Para-BiteRound WormNightcrawlerRoundyUlcer
Leeches LeechKamikaze LeechHoly Leech
Poop DipCorn DipBrown DipSquirtDank SquirtDinga
Skeletons BonyBlack BonyDeath's HeadDank Death's HeadFlesh Death's Head
Ghosts Lil' HauntWizoobRed Ghost
Bats One ToothFat Bat
Fatties FattyFlaming FattyConjoined FattyBlue Conjoined FattyPale Fatty
Hosts HostRed HostWalking HostWalking Red Host
Vises VisDouble VisChubberCage VisScarred Double Vis
Tumors TumorPsy TumorCamillo Jr.
Spikes Wall HuggerSlidePoky
Babies BabyAngelic BabyEmbryoImp
Homunculuses HomunculusBegotten
Keepers KeeperHanger
Grimaces Stone GrimaceVomit GrimaceGaping MawTurret GrimaceBrimstone Grimace
Oobs OobBlack Maw
Others FredLumpB. LickerDukieDopleEvil TwinMeatball

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