Bombs

Bombs
They are used to damage enemies, destroy rocks, and open up closed regular doors and Secret Rooms. When a bomb pickup spawns, there is a chance for it to be replaced by a Troll Bomb instead.

Isaac's bombs deal 60 damage to enemies and one full heart of damage to himself.

Isaac's bombs deal 100 damage to enemies and one full heart of damage to himself. Bomb explosions pierce enemy armor.

Poop
Poop pick-ups are exclusive to as his mechanic uses poops instead of bombs.

Trivia

 * Troll Bombs are a reference to Trolling, an internet term for tricking or messing with people psychologically.
 * The face on the Troll Bomb depicts the Trollface, a face commonly associated with internet trolls and trolling.
 * Mega Troll Bombs are spawned by Super Wrath, Super Pride, War (black Champion), and sometimes Little Horn.
 * In the original game, Mega Troll Bombs can't be blocked by obstacles or non-piercing tears, will follow the player at any distance, and are much faster.