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IsaacHDIsaac Rebirth


Peep Full

Boss Peep

Official artwork by Edmund McMillen.
The Caves
Related Bosse(s)
The Bloat
Effective Item(s)
Dropped Item(s)
Common Drops
WotL Common Drops

Peep (also known as Slug Boy, Sluggy, and Pisser from the art booklet of the Unholy Edition) is a boss appearing in The Binding of Isaac and the Rebirth remake. He can be found in The Caves. Dealing with him can be difficult until Isaac get the hang of his patterns.


He appears to be an obese, dark pink-colored humanoid with a flabby body, stubby limbs, bulging round eyes, and a two front buck teeth. He constantly leaves a trail of urine.


Peep ingame

Peep in Rebirth.

Before Peep does an attack, he will give a signal as to what attack he's going to do.
  • A spray attack that sends ten urine projectiles flying out in a radial burst pattern. This is signaled by Peep smiling and bringing his hands to his face.
  • A jump that brings him crashing down on the location he last saw the player standing in. This is signaled by Peep smiling and throwing his arms wide.
  • Oozing out glowing puddles of yellow creep that deal 1 heart damage if Isaac stand in them. These go away after 5–6 seconds, and don't affect characters with flight. This is signaled by Peep frowning and slightly shrinking, along with him making a burping sound.

Additionally, at 66% and 33% health, he'll detach one of his eyeballs and set it to bouncing around the room in diagonal lines. The eyeballs cannot be damaged at all until Isaac kill Peep himself, so don't waste your time shooting. They leave behind a purely cosmetic blood trail but do 1/2 heart of damage on touch normally and 1 if Isaac are fighting him in The Womb. If Isaac happen to run into Peep himself, beware that he always does a full heart of damage on touch.

The following strategies have proven to work against Peep:

  • The biggest problem in dealing with Peep is the radial burst. Isaac can dodge behind rubble piles (or hover above them if Isaac have flight) to avoid the spray if there are any, but often Isaac will be facing him in an empty room. Isaac's best option there is to stay well away on his left or right side, moving back and forth between opposite sides of the room whenever he launches. At maximum range, Isaac should be able to dodge the burst with just a little movement up or down to put him between shots. Don't forget to watch for the eyeballs, they can sneak up on Isaac if he's focusing on Peep for too long.
  • Because this fight requires so much dodging, items that require careful aim are best avoided. With good timing, bombs/Mr. Boom can be used to catch Peep when he lands after his jump. Spoon Bender or I The Magician can help greatly in keeping Isaac's shots more or less on target while you dodge the pee spray. Range increasing items will give Isaac more room to maneuver; conversely, range reducing pickups like Number One or My Reflection will make his life harder in this fight. Continuous, sustained fire from maximum range is the order of the day here. Peep's eyes are also slowed down by Skatole, making them easier to dodge.
  • The Spider's Bite's slowing tears effect affect Peep in an unusual way. While slowed, Peep's jump will send him straight up into the air, then right back to where he launched from (as opposed to Peep launching and then landing at the location he last saw the player). This makes his pattern very predictable, as Peep can be kept at one spot indefinitely, with the player only occasionally needing to move to dodge the pee spray and eyeballs.
  • Despite being able to jump to great heights, he can't move over rocks while airborne. This allows Isaac to take cover behind or over rocks, but it can also mean that predicting where Peep lands can be tricky without following the urine trail he leaves while he's airborne.

During his death animation, he start "bawling" while flailing his stubby limbs side to side and then stops just before he bursts.


  • If II The High Priestess reduces Peep's health below 33% health before his first eye comes loose, only one will be spawned. Graphically, he will have both eyes missing, but Isaac will only have to dodge one for the remainder of the encounter.

Champion Variants


Peep Blue

Both of his eyes are out right from the beginning of the fight. Otherwise, he behaves the same as the original version.


Peep Yellow

Is physically smaller and behaves like the original, but constantly leaves a urine-trail, even while in mid-air during a jump, which hurts the player if stepped on.


Peep now has 6 eyes instead of two, each eye popping out at a different stage of his health.


  • Peep appears in the demo from the original game.
  • Page 17

    Peep in the artbook.

    Some of Peep's appearances from the artbook are very different to his in-game appearance. Three examples:
    • He was originally going to have six stubby limbs instead of just four.
    • From the right side of the page, he is also going to possess a slug-like tail.
    • Page 10

      Peep as seen in the artbook at page 10.

      Also on page 10, at the top left where he was called as "Sluggy", his appearance look very different comparing to the non-playable character Beggar.
  • Pronounced Pee-pee as a double entendre as his two sources of damage are urine and his eyes.
  • Peep's bulging eyes are a reference to Exophthalmos, a disease that causes the person's (including animals) eyes to bulge.
  • In the original game, if his eye kills Isaac, a Boom Fly will appear on Isaac's Last Will. This is due to the fact that his eyeballs share the same AI as a Boom Fly.
  • If his urine trail kills Isaac from the original game, a Brain will appear on Isaac's last will.
    • This is the case with all forms of creep.
  • The two invincible eyeballs that detach from Peep may be a reference to Gleeok from The Legend of Zelda, a boss which would spawn two invincible heads when damaged.
  • If one look closely at Peep's death animation from the original game, one can see that Peep is crying blood.


  • Since Peep's eyes share coding with the Boom Fly, his eyes may explode when Peep dies or even sometimes shoot six blood projectiles in the same manner of a Red Boom Fly and their movement will be slowed by Skatole.
  • If the character stand right in front of the boss door he will sometimes push them out of the boss room if he jumps on them.



Regular Bosses
Blastocyst button

Chub button

Daddy Long Legs button

Daddy Long Legs
Dark One button

Dark One
Dingle button

Duke of Flies button

The Duke of Flies
Fallen button

The Fallen
Fistula button

Gemini button

Gurdy button

Gurdy Jr button

Gurdy Jr.
Gurgling button

Haunt button

The Haunt
Larry Jr button

Larry Jr.
Little Horn
Loki button

Mama Gurdy button

Mama Gurdy
Mask of Infamy button

Mask of Infamy
Mega Fatty button

Mega Fatty
Mega Maw button

Mega Maw
Monstro button

Mr Fred button

Mr. Fred
Peep button

Pin button

Polycephalus button

Rag Man
Scolex button

Widow button

Posthumous Bosses
Adversary button

The Adversary
Blighted Ovum button

The Blighted Ovum
Bloat button

The Bloat
Cage button

The Cage
Carrion Queen button

Carrion Queen
The Forsaken
The Frail
Gate button

The Gate
Hollow button

The Hollow
Husk button

The Husk
Lokii button

Monstro II button

Monstro II
Teratoma button

The Stain
Wretched button

The Wretched
Alternative Bosses
CHAD button

Gish button

Sister Vis button

Sisters Vis
Steven button

Triachnid button

Conquest button

Death button

Famine button

Headless Horseman button

Headless Horseman
Pestilence button

War button

Final Bosses
XXX button

Isaac button

It Lives button

It Lives
Lamb button

The Lamb
Mega Satan button

Mega Satan
Mom button

Mom's Heart button

Mom's Heart
Satan button

Ultra Greed
Seven Deadly Sins
Envy button

Gluttony button

Greed button

Lust button

Pride button

Sloth button

Wrath button

Seven Super Deadly Sins
Envy button

Super Envy
Super Gluttony button

Super Gluttony
Super Greed button

Super Greed
Super Lust button

Super Lust
Super Pride button

Super Pride
Super Sloth button

Super Sloth
Super Wrath button

Super Wrath
Ultra Pride button

Ultra Pride
Angels / Demons
Krampus button

Angel button

Angel button

Angel button

Fallen Angels
LEGENDS: The Binding of Isaac bosses are yellow. Wrath of the Lamb bosses are teal. Rebirth bosses are orange. Afterbirth bosses are crimson. Afterbirth † bosses are violet.

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