Crystal Ball is an activated item.
Effects[ | ]
Upon use, it:
- Reveals the floor layout and all special rooms except the
Super Secret Room and Ultra Secret Room. - Drops either a Soul Heart or a random card or rune. (50% chance of either)
- While held, increases the chance of finding a Planetarium by 15%, or 100% if a treasure room has been skipped.
While held, increases the chance of finding a 
Notes[ | ]
- Crystal Ball can be obtained by playing a Fortune Telling Machine.
- It's possible to get more than one Crystal Ball from Fortune Telling Machines on a single run.
- It's possible to get more than one Crystal Ball from
- The map revealing effect will not work if the Curse of the Lost is active.
- The Planetarium bonus guarantees the level generation to attempt placing one, but the level layout may not have enough room. Read the article on Planetariums for further details.
Synergies[ | ]
- Book of Virtues: Wisps have much greater health than normal wisps. Tears that are fired from the wisps will auto aim towards nearby enemies, similar to Demon Baby.
Interactions[ | ]
- Daemon's Tail: The chance to drop cards or runes will change to 90%/10% in favor of Soul Heart.
Trivia[ | ]
- The reflection of a face can be seen on the crystal ball's surface. It is easier to make out on the 3DS lower screen icon.
In-game Footage[ | ]
Unlockable Achievements[ | ]
Gallery[ | ]
3DS The icon of Crystal Ball as seen on the lower 3DS screen.
 The Binding of Isaac: Rebirth
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