A smiling stereotypical bomb.
Isaac drops a bomb with larger than normal explosion radius.
Larger than normal explosion radius.
- Bobby-Bomb - Causes Mr. Boom to home in on enemies.
- Bob's Curse - Poison effect also applies to bombs dropped by Mr. Boom.
- Placing Mr. Boom in a room, leaving, and returning to the room will cause Mr. Boom to turn into a normal bomb, but with the same increased blast radius.