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Boom Fly

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Boom Fly


In-game sprite

Related Monsters:
Red Boom Fly
Drowned Boom Fly


  • Damages Isaac upon contact
  • Explodes upon death

Effective item(s):

Boom Flies 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 you, they will instead fly around the room diagonally, bouncing off walls. They have considerable health, taking at least six 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 your distance from it and maintain considerable range; if you stay too close to it when you 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.

Champion Varieties


  • The Skatole item slows down Boom Flies and Red Boom Flies drastically, but they will still explode on death and can damage Isaac.


  • If you 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 you encounter after picking up Bob's Curse. Does not apply for Red Boom Flies.

More info coming soon.

More info coming soon.

More info coming soon.

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