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

Behavior

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 VariantDLC.png

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.

Trivia

Bugs

  • 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.png
    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.
Monsters
Fly.png
Black Fly
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Attack Fly
Moters.png
Moter

White fly.png
Eternal Fly
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Pouter.png
Pooter

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Fat Fly
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Boomfly.png
Boom Fly
Spitfly.png
Red Boom Fly
Gaper.png
Gaper

Frowninggaper.png
Frowning
Gaper

Green gaper.png
Gurgle
DLC.png
Shape4336.png
Mr. Maw
Mulligan.png
Mulligan
Mulligoon.png
Mulligoon
Mulliboom.png
Mulliboom
DLC.png
Hive.png
Hive


Pacer.png
Pacer
Gusher.png
Gusher


Hopper.png
Hopper

FHopper.png
Flaming
Hopper


Leaper.png
Leaper
Vis.png
Vis

Vis Fio.png
Double Vis
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Chubby Vis.png
Chubber
DLC.png
Sucker.png
Sucker

Puffer.png
Spit
DLC.png

Black spider.png
Spider
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Big spider.png
Big Spider
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Spider hopper.png
Trite
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Maggot.png
Maggot
Charger.png
Charger
Spity.png
Spitty
Globin.png
Globin

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Gazing
Globin
Knights.png
Knight

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Selfless
Knight
Horfs.png
Horf
Maws.png
Maw
Redmaw.png
Red Maw

Psychicmaw.png
Psychic
Maw

DLC.png
Boil.png
Boil

Green boil.png
Gut
DLC.png

White boil.png
Sack
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Clotty.png
Clotty

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Clot


Blockade.png
I. Blob
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Eye.png
Eye

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Bloodshot
Eye
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Host
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Red Host
Boby.png
Baby
Angel baby.png
Angelic Baby
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Avarice.png
Keeper
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Hang man.png
Hanger
DLC.png
Pokies.png
Poky

Spike trap.png
Slide
DLC.png
Brain.png
Brain
Membrain.png
Membrain
GutsMonster.png
Guts
Big guts.png
Mama Guts
Leech.png
Leech

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Kamikaze
Leech

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Holy
Leech

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Parabite.png
Para-Bite
Swarmhead.png
Swarmer
DLC.png
Mask Heart.png
Mask + Heart
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Centipede.png
B. Licker
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Fred.png
Fred
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Lump
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Embryo
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Dople
Dople 2.png
Twin Evil
Turret.png
Stone Grimace

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Vomit Grimace
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