Holding any fire button/direction for 2.35 seconds causes Isaac to drop a free Butt Bombs bomb. This includes charging or directly controlled attacks. Only 1 Butt Bomb can be dropped per charging cycle, so it is required to stop firing and then charge again to drop another Butt Bomb. Taking Damage will interrupt the cycle.
There is a visual fart effect whenever a Butt Bomb is placed.
This item belongs to the Oh Crap set. Collecting three items from this set will transform Isaac into a walking pile of poop.
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Essentially grants unlimited bombs, as the charge time can be repeatedly reset by pressing and releasing the fire button. This allows Isaac to bomb an unlimited amounts of tinted rocks, get into every Secret Room and Super Secret Room, etc.
Increases difficulty of poop-themed bosses such as Dingle, as Butt Bombs restore 25% of maximum HP to the bosses when they explode.
The spawned butt bombs will be affected by bomb modifiers, excluding Mr. Mega.
This item can be great for clearing the early floors of Greed mode, due to the butt bombs dealing room-wide damage every few seconds.