Book of 99 – howto.casino

Key game features

Developer

Relax Gaming

RTP

99%

Release Year

2021

Volatility

High

Reels / Paylines

5 reels / 10 paylines

Max Win

12,075x your stake

Bet Range

$0.10 – $100

Mobile Compatibility

Yes

Gameplay & Features :

Wild Symbol: Yes (Book symbol acts as both Wild and Scatter)
Scatter Symbol: Yes (3+ Books trigger Free Spins)
Bonus Round: Free Spins with expanding symbol feature
Autoplay: Yes

Graphics & Sound

The game uses a clean, atmospheric aesthetic with ancient Greek styling. The soundscape is mystical and immersive, complementing the high-stakes gameplay.

Mobile Experience

Book of 99 is fully optimized for iOS and Android, running smoothly with responsive controls and crisp visuals on all screen sizes.

Pros & Cons

Pros:

Extremely high RTP (99%)
Classic expanding symbol free spins mechanic
High volatility and strong max win potential

Cons:

Simple base game
Bonus frequency can vary

Expert Verdict

Book of 99 sets a new standard with its 99% RTP, ideal for players looking for long-term value. With classic "Book of" mechanics and a high-quality production, it’s a top-tier slot for both casual and serious spinners.