The Crystal Ball is an activated item.
Effects
Upon use, it:
- Reveals the floor layout and all special rooms except the Super 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
- The map revealing effect will not work if the Curse of the Lost is active.
- It's possible to get more than one Crystal Ball from Fortune Tellers on a single run.
- 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.
Interactions
- Book of Virtues: Spawns wisps in the middle ring, looking like the crystal ball. Wisps have higher health and 1.2 shot speed.
- Daemon's Tail: The chance to drop cards or runes will change to 90%/10% in favor of cards.
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.
Seeds
PC QDEJ YC0G (Treasure Room adjacent to spawn)
PC 
SDEY E6TL (First floor Treasure Room)
PS4 S9JE DPPD (Treasure Room adjacent to spawn)
 The Binding of Isaac: Rebirth
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