The Binding of Isaac Wiki

Mr. Maw is a monster who can commonly be found in Chapter 3. It is a Maw attached to a Pacer.


Mr. Maw walks towards the player in manner similar to Gapers or Globins. When it gets close to Isaac, he launches its head (still attached by a cord) away from its body.

If the head is destroyed first, Mr. Maw becomes a Pacer or Gusher; if the body is killed first, it becomes a Maw. It also seems to be possible to shoot a Mr. Maw in the neck while its head is extended to split it into both a Pacer and a Maw.

Occasionally, Mr. Maw will split into both a Pacer (or Gusher) and a Maw, without any interference by Isaac.

Mr. Maw will sometimes spawn with an Eternal Fly surrounding it.

Champion VariantWrath of the Lamb DLC[]

Introduced in the Eternal Edition update, but in Hard Mode exclusively, Eternal Mr. Maw acts similarly to its normal counterpart. However every time it shoots its head, it also shoots 8-way bullets.

The head and the body will automatically detach after a certain period of time (varies from almost instant to half a minute). Once it's detached, it always spawns an Eternal Gusher and an Eternal Maw.

For the variant that would spawns an Eternal Fly, it will spawn 3 Eternal Flies surrounding itself.



  • Rarely, Mr. Maw can spawn with an Eternal Fly. The fly seems to follow the head, and will only turn into an Attack Fly when the head is killed. This glitch occurs if a Psychic Maw attempts to spawn as the head of a Mr. Maw.
  • Mr
    Sometimes, a graphical glitch can occur where Mr. Maw's head, when launched at the player, will have the sprite and behavior of the body (as pictured from the right). This is extremely common when using the item Mom's Contacts. Then, if Isaac destroy the actual body part first, the bugged body "head" will shoot at Isaac and become invisible.
  • In addition, there is a rare graphical glitch where the head or body can become invisible to the player after a "normal" separation. If this occurs, the best way of defeating the remaining half is to aim Isaac's shots at the blood trail it leaves behind, if the body is left, or to fire back at where the shots originate from, if the head remains. 
  • Another glitch that can happen is when Mr. Maw launches his head at Isaac it'll go farther than possible. After a while, it'll retract back but instead of re-attaching it'll start going back out again. After a while, it will glitch out, with it's head flashing between two corners of a room (Picture above). If the body is killed the head will be stuck in a wall making it impossible to leave the room without a teleport.
Fly variants FlyBlack FlyCUSTOMredflyAttack FlyMotersMoter • (Wrath of the Lamb DLC: White flyEternal Fly)
Gaper variants GaperGaperFrowninggaperFrowning GaperShape4336Mr. Maw • (Wrath of the Lamb DLC: Green gaperGurgle)
Mulligan variants MulliganMulliganMulligoonMulligoonHiveHive • (Wrath of the Lamb DLC: MulliboomMulliboom)
Horf variants HorfsHorfMawsMawRedmawRed Maw • (Wrath of the Lamb DLC: PsychicmawPsychic Maw)
Vis variants VisVis • (Wrath of the Lamb DLC: Vis FioDouble VisChubby VisChubber)
Maggot variants MaggotMaggotChargerChargerSpitySpitty
Hopper variants HopperHopperFHopperFlaming HopperLeaperLeaper
Boil variants BoilBoil • (Wrath of the Lamb DLC: Green boilGutWhite boilSack)
Clot variants ClottyClottyClot2ClotBlockadeI. Blob
Leech variants LeechLeechLeech2Kamikaze Leech • (Wrath of the Lamb DLC: Holy leechHoly Leech)
Spider variants Wrath of the Lamb DLC: Black spiderSpiderBig spiderBig SpiderSpider hopperTrite
Pooter variants PouterPooter • (Wrath of the Lamb DLC: SuperpooterFat Fly)
Boomfly variants BoomflyBoom FlySpitflyRed Boom Fly
Pacer variants PacerPacerGusherGusher
Sucker variants SuckerSucker • (Wrath of the Lamb DLC: PufferSpit)
Globin variants GlobinGlobinGlobin 2Gazing Globin
Knight variants KnightsKnightAlternative knightSelfless Knight
Eye variants EyeEyeEye2Bloodshot Eye
Host variants Host1HostHost2Red Host
Baby variants BobyBaby • (Wrath of the Lamb DLC: Angel babyAngelic Baby)
Eye variants EyeEyeEye2Bloodshot Eye
Poky variants PokiesPoky • (Wrath of the Lamb DLC: Spike trapSlide)
Brain variants BrainBrainMembrainMembrain
Gut variants GutsMonsterGuts • (Wrath of the Lamb DLC: Big gutsMama Guts)
Dople variants Dople1DopleDople 2Evil Twin
Grimace variants TurretStone Grimace • (Wrath of the Lamb DLC: VomitTurretVomit Grimace)
Keeper variants Wrath of the Lamb DLC: AvariceKeeperHang manHanger
Standalone variants ParabitePara-BiteFredFredLumpLumpEmbryoEmbryoPeep Eye • (Wrath of the Lamb DLC: SwarmheadSwarmerMask HeartMask + HeartCentipedeB. Licker)