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Mr. Maw

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IsaacHDIsaac Rebirth

Mr. Maw is a monster appearing in The Binding of Isaac and the Rebirth remake. They can commonly be found in The Depths. 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.


  • In Rebirth, it can be spawned after defeating the Swinger on the body.


  • From the original game, if Isaac is killed by the head of Mr. Maw, the picture on Isaac's Last Will will be that of a Host.


  • 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. Maw glitch
    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.
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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