Book of Abyss
Dark Book slot centered on expanding bonus symbols
The SlotRanker Score is calculated from the visible data below. It is not affected by affiliate deals, and it cannot be bought.
Why this score
High confidence (86%)Five weighted signals shape the composite. Four context signals refine ties. See how we rate for the full methodology.
Popularity blends real player search demand (~30 markets) with a catalogue-derived proxy; games without measurable search demand use the proxy alone. Not live play telemetry.
SlotRanker Score: 55 — Book of Abyss by Just Slots
https://slotranker.com/just-slots/book-of-abyss#scoreSlot Summary
How It Plays
Book of Abyss uses 10 paylines and keeps ordinary spins focused on line combinations assisted by its Wild Symbol. The larger rule changes wait behind the Free Spins trigger.
Once the feature begins, a selected paying symbol can expand across the reels. That selection gives the bonus a defined target rather than treating every symbol identically.
Theme & Atmosphere
The Book theme is recast through an Underworld setting ruled by a demonic figure, with Darkness and Mystery replacing the archaeological imagery often associated with this format.
That shift changes the game's identity without discarding its recognizable structure. The book remains the bridge between ordinary reel play and the selected-symbol feature.
Features & Win Potential
Expanding Symbols operate during Free Spins, where one paying symbol receives the special role. A complete reel presence can therefore affect several paylines at once.
The Free Spins Multiplier is assigned alongside the selected symbol. Additional Free Spins can extend the round, preserving both the chosen symbol and its enhanced payout condition.
Bonus & Free Spins
The Free Spins round starts by selecting an Expanding Symbol and multiplier. Retriggering adds further spins, so the same selected-symbol condition can remain active for longer.
True Cost to Play
Expected average based on this slot's 94.31% RTP — individual sessions vary with volatility.
Estimate only, for entertainment purposes — treat gambling as entertainment, not a way to make money, and set a budget you can afford to lose.
Bankroll survival simulator
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Compare Book of Abyss with other games
 Book of Abyss Score 55This game |  The Watcher Score 81 |  Legacy of Tombs Score 75 |  Moon Spell Score 74 |  Book of the Damned Score 67 | |
|---|---|---|---|---|---|
| Identity | |||||
| Studio | |||||
| Released | 11/12/2025 | 10/28/2024 | 9/20/2023 | 10/17/2024 | 10/9/2025 |
| Math | |||||
| RTP | 94.31% | 96.01% | 96.09% | 95.76% | 96.11% |
| Volatility | — | High volatility | High volatility | High volatility | High volatility |
| Max win | 15,000× | 9,000× | 5,532× | 5,224× | 10,000× |
| Format | |||||
| Reels | 5 | 6 | 5 | 5 | 5 |
| Layout | 3x5 | 6x6 | 5x3 | 5x3 | 5x3 |
| Paylines | 10 | 40 | 10 | 20 | 10 |
| Min bet | 0.1 | 0.2 | 0.1 | 0.1 | 0.1 |
| Max bet | 60 | 100 | 50 | 10 | 12.5 |
| Features | |||||
| Progressive | — | — | — | — | — |
| Wild symbol | ✓ | ✓ | ✓ | ✓ | ✓ |
| Free spins | ✓ | ✓ | ✓ | — | ✓ |
| Scatter symbol | ✓ | ✓ | ✓ | — | ✓ |
| Multiplier | — | ✓ | — | ✓ | — |
| Bonus game | — | — | — | ✓ | — |
| Respins | — | — | — | ✓ | — |
Every number is shown as a delta against Book of Abyss.
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Questions & Answers
Book of Abyss FAQ
The catalog configuration supplied for Book of Abyss has a 94.31% RTP.
The feature chooses an Expanding Symbol and a multiplier before the awarded spins begin.
It replaces the usual desert setting of many Book slots with Darkness, Mystery, and Underworld imagery.
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