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Disambig.png This article is about the monster. For trinkets, see Category:Worms.

A Round Worm is a worm-like enemy introduced in the vanilla content of The Binding of Isaac: Rebirth. They appear from Chapter 1 to Chapter 4.

It will periodically burrow into the ground and pop up in different part of the room. If Isaac is in their line of sight when that happens, it will spit a blood shot in his direction.

Variations[]

Night Crawler[]

Like the Round Worm, the Night Crawler will burrow into the ground and appear somewhere else. When Isaac is within their line of sight, they will fire four short-range projectiles that spiral outwards.

Roundy[]

Added in Afterbirth

Roundy is a type of Round Worm added in The Binding of Isaac: Afterbirth DLC.

Like the Round Worm, a Roundy will burrow into the ground and appear somewhere else. When it surfaces, it releases a small rock wave around it and fires an Ipecac Ipecac shot towards Isaac.

The Roundy's rock wave and explosive projectile can kill other monsters including each other.

Ulcer[]

Added in Afterbirth

The Ulcer is an enemy added in The Binding of Isaac: Afterbirth DLC.

Like the Round Worm, the Ulcer will burrow into the ground and appear somewhere else. When it surfaces, if Isaac is within its line of sight, it will spawn a Dart Fly Dart Fly, but if there are 6 of them in the current room, it will start firing a blood shot instead. Ulcers burrow underground at a slightly slower rate than most other Worms, usually making them easier to attack.

Tube Worm[]

Added in Afterbirth †

The Tube Worm is a unique variant of the Round Worm found in Added in Repentance Chapter 1.5 and the Flooded Caves Flooded Caves of Chapter 2. They are added in the Booster Pack #4 for The Binding of Isaac: Afterbirth † DLC.

Like the Round Worm, the Tube Worm will burrow into the ground and appear somewhere else. Upon popping out of the ground, they will fire a long-ranged arcing spray of shots at Isaac, attempting to intercept Isaac's position based on his movement. Unlike standard Round Worms, they can fire at Isaac even if they do not have a line of sight.

Fire Worm[]

Added in Repentance

Fire Worms were introduced in The Binding of Isaac: Repentance.

Like the Round Worm, the Fire Worm will burrow into the ground and appear somewhere else. If Isaac is in their line of sight, they will fire a single flame at him. They can only appear in lava-filled gaps.

Tainted Round Worm[]

Added in Repentance

Tainted Round Worms are much stronger and tankier versions of Round Worms. They are added in The Binding of Isaac: Repentance DLC.

Like Round Worms, they will pop out of random locations in the floor, but the Tainted Round Worm does so alongside multiple tail ends. The head and all the tail ends will shoot Isaac together when he is in sight; while the tail ends each shoot a small blood shot, the head spits a large blood shot which will split into 8 blood shots upon obstacle collision. The tail ends can be attacked to deal damage to the Tainted Round Worm.

They are only found on the Ascent to Home Home.

Tainted Tube Worm[]

Added in Repentance

Tainted Tube Worms are a stronger variant of Tube Worms only found in Downpour Downpour during the Ascent. They are added to The Binding of Isaac: Repentance DLC.

After popping up in a random location, they spit 4 spread-out Ipecac Ipecac shots in the direction of Isaac.

Gallery[]

Notes[]

Trivia[]

  • Round Worms are parasitic creatures in real life that can be found inside cats or dogs.
  • Nightcrawlers in real life could refer to earthworms, although they don't look similar to the Nightcrawlers from The Binding of Isaac.
  • Added in Afterbirth Ulcers are a reference to ulcers, breaks in bodily membranes caused by sloughing out of inflamed necrotic tissue.
  • Added in Afterbirth †Tube Worms were created by Kilburn,[1] who later became the programmer and developer for the Repentance DLC.
  • In real-life, tube worms are creatures that live underwater and anchor their tails underground, which may be where the Tube Worm from The Binding of Isaac got its name from. However, they don't resemble real-life tube worms.
  • If a Tube Worm is spawned in a floor other than the Flooded Caves and Downpour, it will have a more Round Worm-like appearance with white skin (this can be seen naturally in Dross).
    • Added in Repentance Same thing occurs with its tainted variant, though it is impossible to see without the use of the Debug Console.

Bugs[]

Bug Bug! If Isaac kills and freezes a Tainted Round Worm using something like Added in RepentanceIce Cube Ice Cube or Added in RepentanceUranus Uranus, it will still deal contact damage upon attempting to push.


  1. Booster Pack #4 is Live! - r/bindingofisaac
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