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For other uses, see Fly (disambiguation).
For the monster from The Legend of Bum-bo, see Fly.

Black Flies (ブラックフライ Burakkufurai), also known as Flies for short, are one of the most common enemies, found in almost all chapters. They can naturally spawn in The Basement. They also come in sort of multiple variants.

Behavior

Black Flies buzz around the room randomly, making buzzing noises, often moving away from the player. They cannot damage Isaac at all, even by touch, making them completely harmless. However, they can turn into relatively dangerous Pooters if they fly around the Poop for too long or come in contact with a golden poop.

Notes

Trivia

  • They appear in the original game.
  • Black Flies, along with other type of flies, are one of the enemies with lack of champion variants.
    • Same apply to Spiders and few other monsters.
  • From the original game, few Black Flies can be seen from the menu screen before starting the game.
    • In Rebirth, however, never appear in the menu screen but few sprites still can be found in the game files.
Monsters
Insects
Black FlyAttack FlyMoterEternal FlyPooterFat FlyBoom FlyRed Boom FlyDrowned Boom FlySuckerSpitDart FlySwarm FlyRing FlyLevel 2 FlyFull FlyHush FlyBall of FliesSpiderBig SpiderTriteRaglingRag TriteLevel 2 SpiderTicking SpiderBaby Long LegsCrazy Long LegsWall CreepBlind CreepRage CreepPara-BiteCod WormScarred Para-BiteRound WormNightcrawlerRoundyUlcerMaggotChargerSpittyConjoined SpittyDrowned ChargerGrubClottyClotMega ClottyLeechKamikaze LeechHoly Leech
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Humanoids
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Poop
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Flyers
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Others
FredLumpEmbryoB. Licker