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The Binding of Isaac

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  3. The Binding of Isaac
  4. Collectibles
  5. Passive Collectibles M-Z
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      • Anarchist Cookbook
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      • Forget Me Now
      • Kamikaze!
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      • Teleport!
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      • We Need To Go Deeper!
      • Yum Heart
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      • <3
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      • Bomb Bag
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      • Dead Cat
      • Dessert
      • Dinner
      • Distant Admiration
      • Demon Baby
      • A Dollar
      • Dr. Fetus
      • Forever Alone
      • Guardian Angel
      • Growth Hormones
      • Halo of Flies
      • Little C.H.A.D.
      • Little Chubby
      • Little Gish
      • Little Steve
      • Loki's Horns
      • Lord of the Pit
      • Lucky Foot
      • Lunch
    • Passive Collectibles M-Z
      • Magic Mushroom
      • Magneto
      • Max's Head
      • Mini Mushroom
      • Mom's Contacts
      • Mom's Eye
      • Mom's Heels
      • Mom's Knife
      • Mom's Lipstick
      • Mom's Underwear
      • Money = Power
      • Mr. Mega
      • My Reflection
      • Number One
      • Odd Mushroom (Large)
      • Odd Mushroom (Thin)
      • Ouija Board
      • Pentagram
      • PHD
      • Raw Liver
      • Robo-Baby
      • Roid Rage
      • Rosary
      • Rotten Meat
      • Sack Of Pennies
      • Sister Maggy
      • Skatole
      • Skeleton Key
      • Small Rock
      • Spelunker Hat
      • Spider's Bite
      • Spoon Bender
      • Steam Sale
      • Steven
      • Super Bandage
      • Technology
      • Transcendence
      • The Battery
      • The Belt
      • The Common Cold
      • The Compass
      • The Halo
      • The Inner Eye
      • The Ladder
      • The Mark
      • The Pact
      • The Parasite
      • The Relic
      • The Virus
      • The Wafer
      • Treasure Map
      • Whore Of Babylon
      • Wiggle Worm
      • Wire Coat Hanger
      • Wooden Spoon
      • XRay Vision
  • Locations and Mechanics
    • Floors
      • The Basement
      • The Caves
      • The Depths
      • The Womb
      • Sheol
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      • Challenge Room
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      • I AM ERROR Room
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      • Blastocyst
      • C.H.A.D.
      • Chub
      • Death
      • Famine
      • Fistula
      • Krampus
      • Gemini
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      • Headless Horseman
      • It Lives
      • Larry Jr.
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      • Mom
      • Mom's Heart
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      • Scolex
      • Steven
      • The Duke of Flies
      • The Fallen
      • War
    • Seven Deadly Sins
      • Envy
      • Gluttony
      • Greed
      • Lust
      • Pride
      • Sloth
      • Wrath
  • Wrath of the Lambs
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      • Best Friend
      • Blood Rights
      • Crack The Sky
      • Crystal Ball
      • D20
      • Dad's Key
      • Guppy's Head
      • Guppy's Paw
      • IV Bag
      • Notched Axe
      • Prayer Card
      • Portable Slot
      • Remote Detonator
      • Spider Butt
      • Telepathy For Dummies
      • The Candle
      • White Pony
    • Passive Collectibles
      • 3 Dollar Bill
      • Abel
      • Ankh
      • Bloody Lust
      • Bob's Curse
      • Box
      • Bum Friend
      • Cat-O-Nine-Tails
      • Celtic Cross
      • Chemical Peel
      • Daddy's Love
      • Dead Dove
      • Epic Fetus
      • Fate
      • Ghost Baby
      • Guppy's Hair Ball
      • Guppy's Tail
      • Habit
      • Harlequin Baby
      • Holy Grail
      • Holy Water
      • Infestation
      • Ipecac
      • Jesus Juice
      • Magic 8 Ball
      • MEAT!
      • Mitre
      • Mom's Purse
      • Mom's Coin Purse
      • Mutant Spider
      • Pageant Boy
      • Polyphemus
      • Pyro
      • Rainbow Baby
      • Sacred Heart
      • Sacrificial Dagger
      • Scapular
      • SMB Super Fan!
      • Speed Ball
      • Spirit Of The Night
      • Squeezy
      • Stem Cells
      • Stigmata
      • Technology 2
      • The Black Bean
      • The Mulligan
      • The Peeper
      • Toothpicks
      • Tough Love
    • Floors
      • Cellar
      • Catacombs
      • Necropolis
      • Utero
      • The Catherdral
      • The Chest
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      • Boss Challenge Room
      • Curse Room
      • Libary
      • Sacrifice Room
      • Super Secret Room
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      • Devil Begger
      • Obstacals
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      • The Blighted Ovum
      • The Bloat
      • The Carrion Queen
      • The Hallow
      • The Husk
      • The Wretched
      • Triachnid
      • Widow
      • ???
    • Seven Super Deadly Sins
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The Binding of Isaac - Mom's Knife

When on the ground Mom's Knife is a big kitchen knife, after Isaac picks it up he gains mom's big polkadot dress along with replacing his tears with the knife. Instead of tears you now throw the knife to hurt enemies, the longer you charge up your knife the shot the farther it will go. The knife is able to pass through enemies and over holes. This collectible is one of the most high damaging in the game only behind Epic Fetus, the most damage is caused by the tip of the blade rather then the body. Mom's Knife is able to synergies with other items that effect tear effects making it even more dangerous. The item can also be used in close range by walking into a enemy with the knife pointing at them to stab them. This item is found in Devil Rooms and Treasure Rooms. It is unlocked by clearing Sheol by beating Saten with Isaac.

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The Binding of Isaac Collectibles

Activated Collectibles

Anarchist Cookbook Bob's Rotten Head Book Of Revelations Book of Shadows Dead Sea Scrolls Deck of Cards Doctor's Remote Forget Me Now Kamikaze! Lemon Mishap Mom's Bottle Of Pills Mom's Bra Mom's Pad Monster Manuel Monstro's Tooth Mr. Boom My Little Unicorn A Pony The Poop Razor Blade Shoop Da Whoop! Tammy's Head Teleport! The Bean The Bible The Book Of Belial The Book Of Sin The Dice (D6) The Gamekid The Hourglass The Nail The Necronomicon The Pinking Shears We Need To Go Deeper! Yum Heart

Passive Collectibles A-L

<3 1UP 9 Volt A Lump of Coal A Quarter Blood Bag Blood Of The Martyr Bobby-Bomb Bomb Bag Boom! Breakfast Brimestone Brother Bobby Bucket of Lard Charm Of The Vampire Chocolate Milk Cube Of Meat Cupid's Arrow Dead Bird Dead Cat Dessert Dinner Distant Admiration Demon Baby A Dollar Dr. Fetus Forever Alone Guardian Angel Growth Hormones Halo of Flies Little C.H.A.D. Little Chubby Little Gish Little Steve Loki's Horns Lord of the Pit Lucky Foot Lunch

Passive Collectibles M-Z

Magic Mushroom Magneto Max's Head Mini Mushroom Mom's Contacts Mom's Eye Mom's Heels Mom's Knife Mom's Lipstick Mom's Underwear Money = Power Mr. Mega My Reflection Number One Odd Mushroom (Large) Odd Mushroom (Thin) Ouija Board Pentagram PHD Raw Liver Robo-Baby Roid Rage Rosary Rotten Meat Sack Of Pennies Sister Maggy Skatole Skeleton Key Small Rock Spelunker Hat Spider's Bite Spoon Bender Steam Sale Steven Super Bandage Technology Transcendence The Battery The Belt The Common Cold The Compass The Halo The Inner Eye The Ladder The Mark The Pact The Parasite The Relic The Virus The Wafer Treasure Map Whore Of Babylon Wiggle Worm Wire Coat Hanger Wooden Spoon XRay Vision

4.02/5
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Quick Details

Developer(s)
Nicalis
Edmund McMillen
Publisher(s)
Edmund McMillen
Nicalis
Release Dates
Microsoft Windows

Sep 28, 2011

Sep 28, 2011

Mac OS

Sep 28, 2011

Sep 28, 2011

PlayStation Vita

Nov 4, 2014

Nov 4, 2014

PlayStation 4

Nov 4, 2014

Nov 4, 2014

Linux

Nov 4, 2014

Nov 4, 2014

Nintendo Switch

Mar 17, 2017

Sep 7, 2017

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Page Contributors

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  • The Binding of Isaac
  • Details
  • Releases
  • Credits
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  • Content
  • Overview
  • Story
  • Gameplay
  • Collectibles
    • Activated Collectibles
      • Anarchist Cookbook
      • Bob's Rotten Head
      • Book Of Revelations
      • Book of Shadows
      • Dead Sea Scrolls
      • Deck of Cards
      • Doctor's Remote
      • Forget Me Now
      • Kamikaze!
      • Lemon Mishap
      • Mom's Bottle Of Pills
      • Mom's Bra
      • Mom's Pad
      • Monster Manuel
      • Monstro's Tooth
      • Mr. Boom
      • My Little Unicorn
      • A Pony
      • The Poop
      • Razor Blade
      • Shoop Da Whoop!
      • Tammy's Head
      • Teleport!
      • The Bean
      • The Bible
      • The Book Of Belial
      • The Book Of Sin
      • The Dice (D6)
      • The Gamekid
      • The Hourglass
      • The Nail
      • The Necronomicon
      • The Pinking Shears
      • We Need To Go Deeper!
      • Yum Heart
    • Passive Collectibles A-L
      • <3
      • 1UP
      • 9 Volt
      • A Lump of Coal
      • A Quarter
      • Blood Bag
      • Blood Of The Martyr
      • Bobby-Bomb
      • Bomb Bag
      • Boom!
      • Breakfast
      • Brimestone
      • Brother Bobby
      • Bucket of Lard
      • Charm Of The Vampire
      • Chocolate Milk
      • Cube Of Meat
      • Cupid's Arrow
      • Dead Bird
      • Dead Cat
      • Dessert
      • Dinner
      • Distant Admiration
      • Demon Baby
      • A Dollar
      • Dr. Fetus
      • Forever Alone
      • Guardian Angel
      • Growth Hormones
      • Halo of Flies
      • Little C.H.A.D.
      • Little Chubby
      • Little Gish
      • Little Steve
      • Loki's Horns
      • Lord of the Pit
      • Lucky Foot
      • Lunch
    • Passive Collectibles M-Z
      • Magic Mushroom
      • Magneto
      • Max's Head
      • Mini Mushroom
      • Mom's Contacts
      • Mom's Eye
      • Mom's Heels
      • Mom's Knife
      • Mom's Lipstick
      • Mom's Underwear
      • Money = Power
      • Mr. Mega
      • My Reflection
      • Number One
      • Odd Mushroom (Large)
      • Odd Mushroom (Thin)
      • Ouija Board
      • Pentagram
      • PHD
      • Raw Liver
      • Robo-Baby
      • Roid Rage
      • Rosary
      • Rotten Meat
      • Sack Of Pennies
      • Sister Maggy
      • Skatole
      • Skeleton Key
      • Small Rock
      • Spelunker Hat
      • Spider's Bite
      • Spoon Bender
      • Steam Sale
      • Steven
      • Super Bandage
      • Technology
      • Transcendence
      • The Battery
      • The Belt
      • The Common Cold
      • The Compass
      • The Halo
      • The Inner Eye
      • The Ladder
      • The Mark
      • The Pact
      • The Parasite
      • The Relic
      • The Virus
      • The Wafer
      • Treasure Map
      • Whore Of Babylon
      • Wiggle Worm
      • Wire Coat Hanger
      • Wooden Spoon
      • XRay Vision
  • Locations and Mechanics
    • Floors
      • The Basement
      • The Caves
      • The Depths
      • The Womb
      • Sheol
    • Rooms
      • Arcade
      • Boss Room
      • Challenge Room
      • Devil Room
      • I AM ERROR Room
      • Secret Room
      • Shop
      • Treasure Room
    • Hearts, Keys and Bombs
    • Cards and Pills
      • Cards
      • Pills
    • Machines, Begger and Shell Game
    • Poop, Rocks, Spikes and Holes
  • Bestiary
    • Normal Enemies
    • Bosses
      • Blastocyst
      • C.H.A.D.
      • Chub
      • Death
      • Famine
      • Fistula
      • Krampus
      • Gemini
      • Gish
      • Headless Horseman
      • It Lives
      • Larry Jr.
      • Loki
      • Mom
      • Mom's Heart
      • Monstro
      • Monstro II
      • Pestilence
      • Satan
      • Scolex
      • Steven
      • The Duke of Flies
      • The Fallen
      • War
    • Seven Deadly Sins
      • Envy
      • Gluttony
      • Greed
      • Lust
      • Pride
      • Sloth
      • Wrath
  • Wrath of the Lambs
    • Activated Collectibles
      • Best Friend
      • Blood Rights
      • Crack The Sky
      • Crystal Ball
      • D20
      • Dad's Key
      • Guppy's Head
      • Guppy's Paw
      • IV Bag
      • Notched Axe
      • Prayer Card
      • Portable Slot
      • Remote Detonator
      • Spider Butt
      • Telepathy For Dummies
      • The Candle
      • White Pony
    • Passive Collectibles
      • 3 Dollar Bill
      • Abel
      • Ankh
      • Bloody Lust
      • Bob's Curse
      • Box
      • Bum Friend
      • Cat-O-Nine-Tails
      • Celtic Cross
      • Chemical Peel
      • Daddy's Love
      • Dead Dove
      • Epic Fetus
      • Fate
      • Ghost Baby
      • Guppy's Hair Ball
      • Guppy's Tail
      • Habit
      • Harlequin Baby
      • Holy Grail
      • Holy Water
      • Infestation
      • Ipecac
      • Jesus Juice
      • Magic 8 Ball
      • MEAT!
      • Mitre
      • Mom's Purse
      • Mom's Coin Purse
      • Mutant Spider
      • Pageant Boy
      • Polyphemus
      • Pyro
      • Rainbow Baby
      • Sacred Heart
      • Sacrificial Dagger
      • Scapular
      • SMB Super Fan!
      • Speed Ball
      • Spirit Of The Night
      • Squeezy
      • Stem Cells
      • Stigmata
      • Technology 2
      • The Black Bean
      • The Mulligan
      • The Peeper
      • Toothpicks
      • Tough Love
    • Floors
      • Cellar
      • Catacombs
      • Necropolis
      • Utero
      • The Catherdral
      • The Chest
    • Rooms
      • Angel Room
      • Boss Challenge Room
      • Curse Room
      • Libary
      • Sacrifice Room
      • Super Secret Room
    • Mechanics
      • Trinkets
      • Devil Begger
      • Obstacals
      • Curses
      • Guppy
    • Challenges
    • Normal Enemies
    • Bosses
      • Conquest
      • Daddy Long Legs
      • Gurdy Jr.
      • Isaac
      • Lokii
      • Mask of Infamy
      • Pin
      • Teratoma
      • The Blighted Ovum
      • The Bloat
      • The Carrion Queen
      • The Hallow
      • The Husk
      • The Wretched
      • Triachnid
      • Widow
      • ???
    • Seven Super Deadly Sins
      • Super Envy
      • Super Gluttony
      • Super Greed
      • Super Lust
      • Super Pride
      • Super Sloth
      • Super Wrath
    • Ultra Pride
  • Guides
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