Bombs are used to damage enemies, destroy rocks, and open up regular doors and Secret Rooms. When spawned, it can be replaced by a Troll Bomb instead. Isaac's bombs deal 60 damage to enemies and one full heart of damage to himself.
Will not add to the player's bomb count, but when picked up, it will give the player unlimited bombs for the duration of the current floor, even if the current number of bombs is 0.
Cannot be picked up. Spawns already ignited and will explode after a few seconds. Safety Scissors will turn this into a Bomb before it explodes.
Megatroll Bomb
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Like Troll Bombs, but are bigger (like bombs upgraded with Mr. Mega) and will chase Isaac if they are nearby (as if under the influence of Magneto). Safety Scissors will turn this into a Double Bomb before it explodes.
Troll Bombs explode after a random amount of time. This means that if two Troll Bombs spawn at the same time right next to each other, there's a high chance one Troll Bomb will blow up before the other, sending that Troll Bomb sliding outwards a bit before exploding.
In the original game, Megatroll Bombs can't be blocked by obstacles or non-piercing tears, will follow the player at any distance, and are much faster.