BOBook of 99
Relax GamingBook of 99 by Relax Gaming is a high volatility slot with a published RTP of 99.00%. The ×10,000 max win makes it one of the higher-paying games in the Relax Gaming catalogue. The book theme is reflected in both the visual design and symbol set.
99.00%
RTP
High
Volatility
×10,000
Max Win
0.10 – 100.00
Bet Range
How to Play
Book of 99 uses a 5×3 grid with paylines. The game features 10 fixed paylines. Bets range from 0.10 – 100.00 per spin. The maximum win potential is ×10,000 your stake.
Bonus Features
Book of 99 includes Free Spins, Expanding Symbols. The free spins round is the main bonus feature, triggered by landing scatter symbols.
Mechanics
Paylines
Features
Free SpinsExpanding Symbols
Specification
| Developer | Relax Gaming |
| RTP | 99.00% |
| Volatility | High |
| Max Win | ×10,000 |
| Bet Range | 0.10 – 100.00 |
| Reels × Rows | 5×3 |
| Ways / Lines | 10 |
| Theme | Book |
| Released | 2021-06 |
| Mechanics | Paylines |
Data note: RTP and specification data sourced from iGaming Tools, cross-checked with slot.report and SlotCatalog.
Where sources disagree, we publish the lower RTP and flag the discrepancy. Operator configurations may differ — always check in-game.
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