Book of 99 by Relax Gaming takes the beloved “Book of” formula and retells it through the lens of ancient Greek mythology. Expect sun-baked temples, storied heroes, and mythical creatures wrapped around classic slot dynamics that prioritize crisp gameplay and high-stakes excitement. It’s a streamlined, feature-forward experience with a fresh twist: a collection mechanic that guarantees entry to the bonus after enough wild books have been gathered.
Whether you’re a seasoned slots enthusiast who loves high-volatility action or a newcomer drawn to straightforward mechanics and polished visuals, Book of 99 strikes a compelling balance. It keeps the base game brisk with fixed paylines and a powerful wild/scatter symbol, then cranks up the drama in free spins with an expanding special symbol capable of sweeping the reels.
Play on desktop or mobile and immerse yourself in a stylized odyssey that’s easy to understand yet packed with potential. At Winna Crypto Casino, you can enjoy fast, private, crypto-powered sessions that make spinning simple and seamless.
Book of 99 by Relax Gaming Game Specifications
| Category | Specification |
|---|---|
| Volatility Level | High |
| Grid Size (Reels x Rows) | 5 x 3 |
| Number of Paylines | 10 |
| Bonus Features | Free Spins, Expanding Symbol in Free Spins, Bonus Round, Re-triggerable Free Spins |
| Special Mechanics | Expanding Symbol, Collectible Symbols Trigger Bonus, Wild/Scatter Symbol (Book), Symbol Collection Meter |
| Unique Aspects | Exceptionally high 99% RTP, Free spins can be triggered by collecting 99 book symbols, Book acts as both wild and scatter, Expanding mythical character symbol in bonus round |
Key Features and Gameplay Mechanics
Reels, Rows, and Paylines
Book of 99 is built on a familiar 5-reel, 3-row grid with 10 fixed paylines. Wins typically pay from left to right starting on the first reel, making it easy to follow and keep track of line hits.
Symbols and Iconography
The paytable blends clean, readable lower-paying symbols with a cast of higher-paying mythic figures, delivering both clarity and thematic flair. The standout icon is the Book—it’s the keystone of the experience and pulls double duty in the base game and bonus.
The Book: Wild and Scatter in One
The Book symbol is both wild and scatter. As a wild, it can substitute for regular symbols to complete or improve winning lines. As a scatter, it’s your ticket to free spins when multiple Books land at once. This dual role keeps the base game dynamic and makes every Book landing meaningful.
How Base Game Wins Are Formed
With fixed paylines, you don’t need to adjust line settings—just set your stake and spin. Wins are awarded when matching symbols align along active lines. The presence of the Book as a wild helps smooth out dry spells and can stitch together line wins that would otherwise slip away.
Collection Mechanic: A Guaranteed Path to the Bonus
On top of traditional scatter triggers, Book of 99 features a collection meter. Each time a Book lands, it contributes to your tally; when the meter fills, the free spins feature triggers. This mechanic rewards persistence and provides a clear, goal-oriented structure to your session, adding a layer of momentum to standard spins.
Bonus Features and Special Mechanics
Free Spins
You can enter free spins in two ways: by landing enough Book scatters at once or by filling the collection meter over time. Entering the bonus via either route leads to the same feature—an intense round where a single symbol is elevated to star status.
Expanding Special Symbol
At the start of free spins, one regular symbol is randomly chosen as the expanding special. When this symbol appears in free spins, it can expand to cover its reel and pay across the lines when enough are present, even if they aren’t strictly adjacent on a single payline. This mechanic is the hallmark of “Book” slots, and Book of 99 executes it with satisfying clarity and punch.
Wilds and Scatters Working Together
The Book keeps its wild/scatter role during the feature. Wild substitutions can help line up standard wins, while extra Books can add scatters to potentially retrigger the bonus. The synergy keeps suspense high on every spin.
Retriggers and Sustained Momentum
Landing additional Books during free spins can retrigger the feature, giving more chances for your special symbol to land, expand, and fill the screen. The best sequences stack retriggers with frequent appearances of the chosen symbol, creating the kind of sweeping wins Book fans play for.
Theme, Graphics, and Audio
Relax Gaming leans into Greek mythology with a refined, modern aesthetic. Ornamental frames, weathered stone, and azure hues evoke ancient coastal cities and heroic journeys. The UI is crisp and uncluttered, so the action and symbols take center stage. Animations are clean and purposeful—expanding reels in the bonus are especially satisfying—and the soundtrack supports the theme with a calm, adventurous tone that swells at the right moments.
The result is an atmosphere that feels both classic and contemporary. It’s unmistakably a “Book” experience, but with a mythic identity that stands on its own.
Technical Specifications
- Provider: Relax Gaming
- Layout: 5 reels, 3 rows
- Paylines: 10 fixed
- Volatility: High
- Core Features: Free spins, expanding special symbol, wild/scatter Book, collection trigger
- Compatibility: Optimized for desktop, tablet, and mobile play
- Theme: Ancient Greek mythology
- Release: 2021
High volatility means the game can deliver stretches of quieter spins punctuated by impactful hits—especially during the bonus. Players who enjoy building toward big moments and don’t mind a swingy ride will feel right at home.
How to Play Book of 99
Getting started is straightforward and intuitive:
- Choose your total stake per spin.
- Spin the reels and watch for line hits and Book symbols.
- Collect Books to fill the meter or land enough scatters at once to enter free spins.
- In the bonus, aim for frequent appearances of the chosen expanding symbol to drive the biggest wins.
Because paylines are fixed, you don’t need to configure lines—just focus on managing your stake and enjoying the flow.
Gameplay Tips and Responsible Play
- Plan for Variance: High-volatility slots can require patience. Set a sensible session budget and timeframe before you start.
- Leverage the Collection: The meter provides a clear objective. Sessions that capitalize on nearing a full meter can feel especially rewarding.
- Pace Your Spins: Consider steady spin pacing to let the collection mechanic work and to manage bankroll across swings.
- Know the Paytable: Familiarize yourself with the premium symbols so you instantly recognize strong setups in the bonus.
- Try Before Committing: If a demo mode is available in your region, use it to get comfortable with the expanding symbol mechanic.
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Book of 99 Slot Verdict
Book of 99 by Relax Gaming delivers a confident, polished take on a fan-favorite slot genre. The wild/scatter Book keeps base spins engaging, the collection meter provides a guaranteed path into free spins over time, and the expanding special symbol brings real knockout potential once the bonus lands. Wrapped in a stylish Greek theme and tuned for modern play on any device, it’s a compelling choice for players who enjoy high-volatility gameplay with clear, satisfying mechanics.
If you love “Book” slots—or you’re ready to experience one of the cleanest versions around—Book of 99 is a must-try. Load it up, set your stake, and let the odyssey begin.