Boss Pin
Found In
The Cellar
The Catacombs (Double Trouble)
The Depths (Normal Enemy)
Boss Challenge Room
Dropped Items
Boss Pool

Pin is one of the bosses that can appear in The Cellar. It is amongst the most common to fight, particularly because it can appear on later floors as an enemy.


Pin is largely unchanged from original. His overhaul though is that Pin now better tracks the player, and that it no longer damages itself.

  • Sometimes, a Spitty, conjoined spitty or round worm can be in the middle of the room at the start of the battle.
  • Pin will propel himself out of the ground, attempting to ram the player.
  • Four tears will shoot diagonally from where Pin emerged.
  • Occasionally, it will stick its head out of ground in order to fire an explosive projectile.

Champion VersionsEdit

Black: Is larger and fires six shots instead of an explosive projectile.


  • Pin was added in the Wrath of the Lamb DLC for the original Binding of Isaac.
  • Pin is based off the pinworm, an internal parasite.
  • Pin is likely a reference to Lanmola, a boss from The Legend of Zelda: A Link to the Past; as nearly all attacks are the same.


  • Pin's health bar does not accurately display the total health of the boss. You only need to reduce Pin down to approximately 1/8th of its total health to kill it.


Bosses Boss Monstro
Basement MonstroGeminiDingleLarry Jr.The Duke of FliesGurglingsFistulaStevenFamine
Cellar Gurdy Jr.PinWidowBlighted OvumThe HauntDingleLarry Jr.The Duke of FliesGurglingsFistulaFamine
The Caves ChubGurdyGurdy Jr.Mega MawMega FattyDark OneC.H.A.D.Pestilence
Catacombs The HollowThe HuskPeepPolycephalusThe Carrion QueenThe WretchedDark OnePestilence
The Depths The CageMonstro IIThe AdversaryThe GateLokiGishWarMom
Necropolis The BloatThe Carrion QueenMask of InfamyThe WretchedThe GateLokiWarMom
The Womb Mr. FredScolexTeratomaMama GurdyThe BloatLokiiDeathConquestMom's HeartIt Lives
Utero BlastocystDaddy Long LegsTeratomaMama GurdyThe BloatLokiiTriachnidDeathConquestMom's HeartIt Lives
Sheol The FallenSatan
Dark Room The LambMega Satan
Cathedral Isaac
The Chest ???Mega Satan
Devil Room Krampus
Angel Room Angel
Levels 1-5/7 The FallenThe Headless Horseman
Community content is available under CC-BY-SA unless otherwise noted.