Book of 99 Slot — Free Demo & Review
Play the Book of 99 slot for free in demo mode below. Developed by Relax Gaming, it is a greek mythology, books themed game with a 99.0% RTP and medium volatility. Try every feature with virtual credits — no download, deposit or sign-up required.
Free demo for entertainment only. 18+. Please gamble responsibly.
Book of 99 Slot Facts
| Game | Book of 99 |
| Provider | Relax Gaming |
| RTP | 99.0% |
| Volatility | Medium |
| Theme | Greek Mythology, Books |
| Min bet | $0.1 |
| Max bet | $100.0 |
| Features | Expanding Symbols, Free Spins |
| Released | May 2021 |
About the Book of 99 Slot
Book of 99 by Relax Gaming is a greek mythology, books themed online slot released in 2021. Its theoretical return to player (RTP) sits at 99.0%, slightly above the industry average of roughly 96%. With medium volatility, wins strike a balance between frequency and size. You can test all of this risk-free in the free demo above before deciding whether the game suits your style.
How to Play the Book of 99 Demo
- Click the “Play Book of 99 Demo” button above to launch the game.
- Set your bet size anywhere between $0.1 and $100.0 using the game controls.
- Spin the reels with virtual credits and explore the Expanding Symbols, Free Spins.
- When you are ready to play for real, check our recommended casino sites.
Book of 99 Bonus Features
- Expanding Symbols
- Free Spins
Book of 99 Slot FAQ
Can I play the Book of 99 slot for free?
Yes. You can play the Book of 99 demo for free at SLOTyi using virtual credits — no download, deposit or registration required.
What is the RTP of Book of 99?
The Book of 99 slot has a 99.0% RTP (return to player), developed by Relax Gaming.
Is Book of 99 a high volatility slot?
Book of 99 is a medium-volatility slot, which shapes how often and how large its wins tend to land.
What features does the Book of 99 slot have?
Book of 99's main bonus features include Expanding Symbols, Free Spins.
Who makes the Book of 99 slot?
Book of 99 was created by the game studio Relax Gaming and released in 2021.
Where to Play Book of 99 for Real Money
Ready to move on from the demo? Compare vetted, bonus-loaded casinos where you can play Book of 99 with real stakes.
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Reviewed by the SLOTyi editorial team. Slot data (Book of 99, Relax Gaming) is provided for informational and entertainment purposes only. 18+ · Please gamble responsibly.
