Book of 99 Slot Demo - Free Play
Book of 99 Slot Review
Book of 99 by Relax Gaming is a rare find: a high-volatility “book” slot with a staggering 99% RTP. Set amid ancient Greek legends, its five reels feature heroes, a cyclops, and a harpy, while a persistent book-collection mechanic helps you trigger free spins more often. With a top payout of up to 12,070x your bet, the Book of 99 slot blends classic expanding-symbol gameplay with player-friendly math.
How to Play Book of 99
The reels sit between temple columns, with a book meter rising alongside them as you collect wild books. Jewelled card symbols cover the lower pays; premium character symbols deliver the bigger hits across 10 paylines.
- Reels/Lines: 5 reels, 10 paylines (left to right)
- Stakes: 0.10 – 100.00 per spin
- Devices: PC, iOS, Android, Windows Mobile
- Quick Play/Autospin: Available via the control panel (region dependent)
Open the paytable to see stake-adjusted values and feature rules. The heroic character can pay from 1x up to 500x your total bet.
Book of 99 Symbols & Payouts
- Lows: Jewelled A–10 card symbols.
- Highs: Greek heroes and monsters (hero is the top payer).
- Book Symbol: Acts as both a wild (substitute) and a scatter trigger.
Book of 99 Bonus Features & Free Spins
Every time a book lands, the meter increases by 1—whether it helps a win or not. Reach 99 books to trigger free spins automatically.
Alternatively, land three books in a single spin to launch the bonus immediately.
Free Spins with Expanding Symbol
- Random Special Symbol: Chosen at bonus start; it expands wherever it lands.
- Pays Anywhere: Expanded symbols don’t need to be adjacent to count.
- Retriggers: 3+ books during the bonus award, extra free spins.
Slot Features
- 3 Rows
- 5 Reels
- 10 Paylines
- Multipliers
- Scatters
- Wild symbol
- Free Spins
- Stacked symbols
- Re-spins
- Quickspin
- Gamble feature
- Retriggering
- Bonus Buy
Book of 99 RTP, Volatility & Max Win
- RTP: 99% (exceptionally high)
- Volatility: High
- Max Win: Up to 12,070x (as much as 1,207,000.00 at 100.00 stake)
The unusually high RTP means more substantial long-term value, but the high volatility still brings swingy sessions.
Book of 99 Verdict
The Book of 99 online slot keeps the beloved “book” formula—wild/scatter books and an expanding special—while adding a smart 99-book collection that nudges you toward the bonus. If you want classic mechanics with near-unbeatable RTP and serious upside, play Book of 99.
FAQs
What is the RTP of Book of 99?
99%—exceptionally high compared to most online slots.
How do I trigger the free spins?
Either collect 99 books via the meter or land three book symbols in a single spin.
What’s the max win?
Up to 12,070x your bet.
Does Book of 99 have an expanding symbol?
Yes. A random symbol is selected at bonus start; it expands and pays anywhere during free spins.
Can I play Book of 99 on mobile?
Absolutely—it's optimized for iOS, Android, tablets, and desktop.
