Jar of Flies

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(except in Rebirth)

Jar of Flies is an activated item added in The Binding of Isaac: Afterbirth.

Effects

  • Killing an enemy adds a fly to the jar, up to a maximum of 20.
  • Upon use, releases Blue Flies equal to the number of flies in the jar.
  • This item belongs to the BeelzebubBeelzebub set. Collecting three items from this set will transform Isaac into a giant humanoid fly.

Notes

  • Kills by blue flies and locusts (including flies from the jar) and certain familiars (including (except in Repentance)Collectible Incubus icon.pngIncubus and the launch attack from (in Repentance) Character Tainted Lilith icon.pngTainted Lilith's fetus) do not add flies to the jar.
Items that add to Jar of Flies
(in Afterbirth † and Repentance)Collectible 7 Seals icon.png7 Seals contact
(in Repentance)Collectible Abyss icon.pngAbyss locusts
(in Afterbirth † and Repentance)Collectible Angry Fly icon.pngAngry Fly
(in Repentance)Apollyon's Best FriendApollyon's Best Friend
Collectible Ball of Bandages icon.pngBall of Bandages contact
Collectible BBF icon.pngBBF
Collectible Big Fan icon.pngBig Fan
(in Afterbirth † and Repentance)Collectible Bloodshot Eye icon.pngBloodshot Eye contact
Blue Spiders
Collectible Bob's Brain icon.pngBob's Brain
(in Afterbirth † and Repentance)Collectible Book of the Dead icon.pngBook of the Dead bone orbitals
(in Afterbirth † and Repentance)Collectible Book of the Dead icon.pngBook of the Dead bony contact
(in Repentance)Collectible Book of Virtues icon.pngBook of Virtues / (in Repentance)Collectible Jar of Wisps icon.pngJar of Wisps Wisp contact
Collectible Bumbo icon.pngBumbo level 4
(in Repentance)Collectible Cain's Other Eye icon.pngCain's Other Eye
Collectible Daddy Longlegs icon.pngDaddy Longlegs
(in Afterbirth † and Repentance)Collectible Depression icon.pngDepression
Collectible Distant Admiration icon.pngDistant Admiration
Collectible Dry Baby icon.pngDry Baby
Collectible Farting Baby icon.pngFarting Baby
(in Afterbirth † and Repentance)Collectible Finger! icon.pngFinger!
Collectible Forever alone icon.pngForever alone
(in Repentance)Found SoulFound Soul
Collectible Friend Zone icon.pngFriend Zone
Friendly enemy contact
Friendly enemy lasers
(in Repentance)Collectible Fruity Plum icon.pngFruity Plum
(in Repentance)Collectible Gello icon.pngGello tears
(in Repentance)Collectible Ghost Bombs icon.pngGhost Bombs ghosts
Collectible Guillotine icon.pngGuillotine orbital
Collectible Guppy's Hairball icon.pngGuppy's Hairball
Collectible Headless Baby icon.pngHeadless Baby
Collectible Holy Water icon.pngHoly Water
(in Repentance)Collectible Hungry Soul icon.pngHungry Soul ghosts
(in Afterbirth † and Repentance)Collectible Hushy icon.pngHushy
(in Repentance)Collectible Incubus icon.pngIncubus
(in Repentance)Collectible The Intruder icon.pngThe Intruder contact
Collectible Leech icon.pngLeech
(in Repentance)Collectible Lemegeton icon.pngLemegeton wisps
(in Repentance)Collectible Lil Abaddon icon.pngLil Abaddon
Collectible Lil Brimstone icon.pngLil Brimstone
(in Repentance)Lil ClotLil Clot
Collectible Lil Gurdy icon.pngLil Gurdy
Collectible Lil Haunt icon.pngLil Haunt
(in Afterbirth † and Repentance)Collectible Lil Spewer icon.pngLil Spewer
Collectible Lost Fly icon.pngLost Fly
(in Afterbirth † and Repentance)Collectible Mom's Razor icon.pngMom's Razor
Collectible Mongo Baby icon.pngMongo Baby copying one in this list
Collectible My Shadow icon.pngMy Shadow
Collectible Obsessed Fan icon.pngObsessed Fan
Collectible The Peeper icon.pngThe Peeper
Collectible The Pinking Shears icon.pngThe Pinking Shears body
(in Afterbirth † and Repentance)Collectible Pointy Rib icon.pngPointy Rib
(in Repentance)Collectible Quints icon.pngQuints babies that copy one in this list
Collectible Robo-Baby icon.pngRobo-Baby
Collectible Robo-Baby 2.0 icon.pngRobo-Baby 2.0
Collectible Sacrificial Dagger icon.pngSacrificial Dagger
Collectible Samson's Chains icon.pngSamson's Chains
(in Repentance)Collectible Scissors icon.pngScissors
(in Repentance)Collectible The Scooper icon.pngThe Scooper
(in Afterbirth † and Repentance)Collectible Shade icon.pngShade
Collectible Smart Fly icon.pngSmart Fly
Collectible Spider Mod icon.pngSpider Mod burn and poison
(in Afterbirth † and Repentance)Collectible Sprinkler icon.pngSprinkler
(in Repentance)Collectible Stitches icon.pngStitches
Collectible Succubus icon.pngSuccubus
(in Repentance)Collectible Sumptorium icon.pngSumptorium clot tears
(in Repentance)Collectible Tinytoma icon.pngTinytoma
(in Repentance)Collectible Vengeful Spirit icon.pngVengeful Spirit contact
(in Repentance)Collectible Worm Friend icon.pngWorm Friend
Items that don't add to Jar of Flies
Collectible Blue Baby's Only Friend icon.png???'s Only Friend
???'s Soul???'s Soul
Collectible Abel icon.pngAbel
Collectible Ball of Bandages icon.pngBall of Bandages tears
Collectible Best Bud icon.pngBest Bud
(in Afterbirth † and Repentance)Collectible Big Chubby icon.pngBig Chubby
(in Repentance)Collectible Bird Cage icon.pngBird Cage
(in Afterbirth † and Repentance)Collectible Bloodshot Eye icon.pngBloodshot Eye tears
Blue Flies
(in Repentance)Collectible Boiled Baby icon.pngBoiled Baby
(in Afterbirth † and Repentance)Collectible Book of the Dead icon.pngBook of the Dead bony shots
(in Repentance)Collectible Book of Virtues icon.pngBook of Virtues / (in Repentance)Collectible Jar of Wisps icon.pngJar of Wisps wisp tears
(in Repentance)Collectible Bot Fly icon.pngBot Fly
Collectible Brother Bobby icon.pngBrother Bobby
(in Afterbirth † and Repentance)Collectible Brown Nugget icon.pngBrown Nugget
(in Afterbirth † and Repentance)Collectible Buddy in a Box icon.pngBuddy in a Box
Collectible Bumbo icon.pngBumbo level 3 tears
(except in Repentance)Collectible Cain's Other Eye icon.pngCain's Other Eye
Charmed enemies
(in Repentance)Collectible Cube Baby icon.pngCube Baby
Collectible Cube of Meat icon.pngCube of Meat
Collectible Dead Bird icon.pngDead Bird
Collectible Demon Baby icon.pngDemon Baby
Eve's Bird FootEve's Bird Foot
Collectible Fate's Reward icon.pngFate's Reward
(in Repentance)Collectible Freezer Baby icon.pngFreezer Baby
Friendly enemy tears
(in Repentance)Collectible Gello icon.pngGello whip
Collectible Gemini icon.pngGemini
Collectible Ghost Baby icon.pngGhost Baby
(in Repentance)Collectible Giant Cell icon.pngGiant Cell
Collectible Guardian Angel icon.pngGuardian Angel
Collectible Halo of Flies icon.pngHalo of Flies
Collectible Harlequin Baby icon.pngHarlequin Baby
(except in Repentance)Collectible Incubus icon.pngIncubus
(in Repentance)Collectible The Intruder icon.pngThe Intruder tears
Isaac's HeadIsaac's Head
Collectible Isaac's Heart icon.pngIsaac's Heart
(in Afterbirth † and Repentance)Collectible Jaw Bone icon.pngJaw Bone
(in Repentance)Collectible Knife Piece 1 icon.pngKnife Piece 1 & (in Repentance)Collectible Knife Piece 2 icon.pngKnife Piece 2
(in Repentance) Knockback damage (e.g. Collectible Butter Bean icon.pngButter Bean)
(in Afterbirth † and Repentance)Collectible Leprosy icon.pngLeprosy
(in Repentance)Collectible Lil Dumpy icon.pngLil Dumpy
Collectible Lil Loki icon.pngLil Loki
(in Afterbirth † and Repentance)Collectible Lil Monstro icon.pngLil Monstro
(in Repentance)Collectible Lil Portal icon.pngLil Portal
Collectible Little Chubby icon.pngLittle Chubby
Collectible Little Gish icon.pngLittle Gish
Collectible Little Steven icon.pngLittle Steven
Collectible Mongo Baby icon.pngMongo Baby's base tears or copying any familiar in this list
Collectible Papa Fly icon.pngPapa Fly
(in Repentance)Collectible Psy Fly icon.pngPsy Fly
(in Repentance)Collectible Purgatory icon.pngPurgatory ghosts
(in Repentance)Collectible Quints icon.pngQuints babies that copy any familiar in this list
Collectible Rainbow Baby icon.pngRainbow Baby
(except in Repentance)Collectible Scissors icon.pngScissors head
Collectible Seraphim icon.pngSeraphim
Collectible Sister Maggy icon.pngSister Maggy
(in Afterbirth † and Repentance)Collectible Slipped Rib icon.pngSlipped Rib
Collectible Spider Mod icon.pngSpider Mod shrink
(in Repentance)Collectible Spin to Win icon.pngSpin to Win orbital
Collectible Sworn Protector icon.pngSworn Protector
(in Repentance)Collectible Uranus icon.pngUranus
(in Repentance)Collectible Vade Retro icon.pngVade Retro ghosts
(in Repentance)Collectible Vengeful Spirit icon.pngVengeful Spirit tears
  • Friendly enemies such as from the Collectible Friendly Ball icon.pngFriendly Ball add flies to the jar, but not those spawned from other enemies.
  • Batteries do not affect the number of flies in the jar.
  • Enemies must be actually killed to add a fly; transformations (such as Gaper.pngGapers turning into Pacer.pngPacers) or knockouts (such as incapacitating a Globin.pngGlobin) do not count as kills.
  • Destroying a Shopkeeper.pngShopkeeper will count as a kill.
  • With items that kill normally unkillable enemies, killing things like Stone Grimace.pngStone Grimaces will add flies to the jar.
  • Killing minions in the Hush fight does not add flies to the jar.

Synergies

  • (in Repentance)Collectible Book of Virtues icon.pngBook of Virtues: Using Jar of Flies summons wisps instead of Blue Flies; the wisps do not summon the flies when destroyed. Up to five flies at a time are consumed to summon one wisp, with stacking health and damage. The damage of the wisps decreases as they take damage. Enemies killed by wisps’ tears will not add flies to the jar.
  • (in Afterbirth † and Repentance)Fish TailFish Tail: Doubles the number of flies that spawn.
  • Collectible Hive Mind icon.pngHive Mind: Flies are bigger and deal double damage.
  • (in Afterbirth † and Repentance)Collectible Schoolbag icon.pngSchoolbag: Flies will be gained even while the Jar of Flies is in the inactive slot.

Interactions

  • (in Repentance)Ace Cards: Enemies that are turned into pickups do not grant extra flies.
  • Collectible Car Battery icon.pngCar Battery: No effect.
  • Collectible E. Coli icon.pngE. Coli/Collectible Flush! icon.pngFlush!: Enemies that are turned into poop do not grant extra flies.
  • (in Repentance)Collectible Uranus icon.pngUranus: Enemies frozen by Uranus do not grant extra flies, even if shattered. Only enemies killed with bombs will add flies.
  • (in Afterbirth † and Repentance)Collectible Void icon.pngVoid: Flies will not collect when absorbed by Void, making the interaction worthless.
  • Collectible Infestation 2 icon.pngInfestation 2: Blue Spiders spawned by Infestation 2 grant extra flies, and Blue Flies spawned by Jar of Flies spawn Blue Spiders.

In-game Footage

Trivia

  • (except in Repentance) The item's pickup quote references the tagline of the Pokémon games. The quote said "Gotta catch 'em all?"
  • (in Afterbirth † and Repentance) With Booster Pack #2, this item's sprite fills up with more flies depending on how many flies it contains. This is based on this Steam Workshop mod by Stewartisme.
  • The item is likely a reference to the Alice In Chains album of the same name.

Bugs

Bug Bug! (except in Repentance) The synergy of Collectible The Ludovico Technique icon.pngThe Ludovico Technique with Collectible Brimstone icon.pngBrimstone or Collectible Technology icon.pngTechnology will not spawn flies.