Guppy's Hair Ball

"Swing it"
Entity ID	5.100.187
Item Pool	Devil Room Devil Room
Collection Grid	(page 2, column 4, row 9) (page 2, column 4, row 4)
Unlock Method	Become Guppy

Guppy's Hair Ball is an unlockable passive item.

Effects

• Spawns a hairball familiar that loosely follows behind Isaac, blocks shots, and can be swung like a flail to damage enemies.
  • The ball deals 5 damage per tick, but grows for +2 damage when it kills an enemy — up to 5 times for a maximum of 13 damage. The damage it deals per tick (each half-second) is (level × 2) + 3.
  • The hairball level decreases upon entering a new floor: if level 2, it reverts to level 1. If level 3 or 4, it reverts to level 2. If level 5, it reverts to level 3.
• This item belongs to the Guppy set. Collecting three items from this set will transform Isaac into Guppy.

Notes

• The hairball's hitbox is the same size regardless of level.
• Killing the Blue Flies that Hush spawns does not increase its level.
• If Isaac has transformed into Guppy, Guppy's Hair Ball spawns Blue Flies when it deals damage.
• If Blindfolded, the ball occasionally spawns a Blue Fly while it's damaging an enemy.

Trivia

• This item is used in Cat Got Your Tongue (challenge #8).
• The function and flavor text of this item might reference the idioms "no room to swing a cat" and "can't swing a dead cat without hitting...".
• In the original The Binding of Isaac, Guppy's Hairball did not count towards the Guppy transformation.

Pet Items

Cricket:

• Cricket's Body
• Cricket's Head

Guppy:

• Dead Cat
• Guppy's Collar
• Guppy's Eye
• Guppy's Hair Ball
• Guppy's Head
• Guppy's Paw
• Guppy's Tail
• Kid's Drawing

Tammy:

• Tammy's Head