Binding of Isaac: Rebirth Wiki

Added in Repentance

Rocket in a Jar is a passive item added in The Binding of Isaac: Repentance.


  • Adds 5 bombs.
  • If any firing input is given when placing a bomb, a fast-moving, explosive rocket will be shot in the direction corresponding to the input.
    • The rockets accept analog firing input. This means they can be shot diagonally or in any other angle with a mouse or joystick.
    • Isaac will place a regular bomb if no firing input is received.


  • Rockets use Isaac's bomb synergies like his bombs normally would.
  • Rockets are unaffected by Isaac's shot speed.
  • Rockets can be boosted by Brimstone Brimstone lasers and Hemoptysis Hemoptysis sneezes.
  • Bosses such as Chub or Carrion Queen can swallow the rockets just like regular bombs.


  • Bobby-Bomb Bobby-Bomb: Rockets become homing.
  • Dr. Fetus Dr. Fetus: Shoots rockets as normal tears. All synergies that would normally apply are given to the rockets.
  • Giga Bombs: Fires a giant rocket that moves slower and has the same effects as a normal Giga Bomb.


  • Epic Fetus Epic Fetus: No effect.
  • Mr. Boom Mr. Boom: No effect.
  • Marked Marked: Rockets will fly to the location of the crosshair.
  • Sticky Bombs Sticky Bombs: Rockets will not stick onto enemies.
  • Remote Detonator Remote Detonator: Rockets do not explode on impact with surfaces, requiring manual detonation.
    • Remote Detonator + Dr. Fetus: Rockets fired with Dr. Fetus will still explode on impact, but can be manually detonated.
  • Worm trinkets: Rocket's trajectory is unaffected.
    • Wiggle Worm Wiggle Worm + Dr. Fetus: Rocket will wiggle from side to side mid-flight. This is the only worm trinket that affects Rocket in a Jar.

In-game Footage[]


  • Rocket in a Jar originates from the Antibirth mod.
  • Rocket in a Jar resembles a missile tank upgrade from the Nintendo franchise Metroid.