| Provider | Relax Gaming |
| Reels | 5 |
| Paylines | 10 |
| RTP | 99% |
| Max Win | 12,075x |
| Volatility | High |
| Release Date | 2021-05-04 |
| Our Rating | 8.7 |
Explore Book of 99 by Relax Gaming — featuring 99% RTP with a maximum payout of x12075. Spin the free demo above to test the gameplay risk-free before playing for real.
Game Features
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Book of 99 Paytable
Scatter, Wild
| 5 | x500 |
| 4 | x100 |
| 3 | x10 |
| 2 | x1 |
| 5 | x200 |
| 4 | x40 |
| 3 | x4 |
| 2 | x0.5 |
| 5 | x75 |
| 4 | x10 |
| 3 | x3 |
| 2 | x0.5 |
| 5 | x75 |
| 4 | x10 |
| 3 | x3 |
| 2 | x0.5 |
| 5 | x15 |
| 4 | x4 |
| 3 | x0.5 |
| 5 | x15 |
| 4 | x4 |
| 3 | x0.5 |
| 5 | x10 |
| 4 | x2.5 |
| 3 | x0.5 |
| 5 | x10 |
| 4 | x2.5 |
| 3 | x0.5 |
| 5 | x10 |
| 4 | x2.5 |
| 3 | x0.5 |
Game Gallery
Book of 99 — Expert Take
Book of 99 from Relax Gaming launched on 2021-05-04, delivering High volatility gameplay for a wide range of bankrolls. With a 99% return-to-player rate and a peak payout multiplier of x12075, it strikes a solid balance between risk and reward. Fire up the free demo at the top of this page to get a feel for the mechanics before wagering real money.
Book of 99 — Our Score
4.4 out of 5
Bonus Mechanics
Visual Appeal
Audio Experience
Win Potential
Innovation
Value for Money
Reviewed by: Oliver Thornton
Updated 11 March 2026
Book of 99 — Common Questions
Yes. Book of 99 is developed by Relax Gaming, a licensed studio that operates under strict regulatory oversight. Every spin is governed by a certified Random Number Generator (RNG), which is independently audited to ensure completely fair and unpredictable results. You can play with confidence knowing the game meets international iGaming standards.
Absolutely. The free demo at the top of this page lets you spin Book of 99 with virtual credits — no sign-up, no deposit, no personal details required. It is the same game engine used in real-money mode, so you get the authentic experience risk-free.
Book of 99 offers a peak payout of 12,075x your total stake. This means a single winning combination or bonus round can multiply your bet by that factor. Keep in mind that maximum wins are theoretical caps set by Relax Gaming and landing them requires the right combination of luck and bonus triggers.
Not in the demo version — free play uses virtual credits only. To win real money on Book of 99, you need to register at a licensed online casino that carries Relax Gaming titles. Once signed up and deposited, you play the same game with real stakes and real payouts.
Yes. Book of 99 is built with HTML5 technology, so it runs directly in any modern mobile browser — iPhone, Android, or tablet. No app download is needed. The interface adapts automatically to your screen size, and you can try the demo right here on WinGuru from your phone.
Yes. The demo of Book of 99 uses exactly the same software, math model, RTP, and bonus mechanics as the real-money version. The only difference is that you spin with virtual credits instead of actual funds. This makes it an ideal way to learn the paytable, test betting strategies, and explore bonus features before committing real money.
WinGuru hosts a full library of free demos from Relax Gaming and dozens of other studios. Visit our provider page to browse all available Relax Gaming titles, or use the search bar to find a specific game. Every slot on the site includes a free demo so you can try before you play.
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