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Book of Secrets is an unlockable activated item. Randomly adds the effect of Treasure Map, The Compass, or Blue Map for the duration of the current floor. If all effects are active, X-Ray Vision is provided for the floor instead.
Achievements are unlocked after completing Challenges, reaching certain milestones, achieving hidden goals, or unlocking certain items. In the PC version, every Steam achievement exactly corresponds to one secret in-game, whereas only a handful of secrets are represented by PSN trophies in the PlayStation version of the game.
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Nov 6, 2021 · How to unlock the The Book of Secrets achievement in The Binding of Isaac: Rebirth: Kill Satan with Eden. This achievement is worth 15 Gamerscore.
Aug 29, 2015 · Binding of Isaac: Rebirth - Item guide series This episode gives you the guide to Book Of Secrets.
Book of Secrets Item Effect • When used, you have a chance of getting one of the three following effects: Treasure Map (floor layout), Compass (map icons) or Blue Map (secret room locations)