Header btn

Book of 99

Book of 99 slots online
Button play Play For Real
Warning You can play if you are 18 years of age or older!
Software Relax gaming Scatter Symbol Yes Symbol Stacked No
Layout 44990 Technology JS, HTML5 Slot Theme Ancient civilizations
RTP 99.0% Slot reels 5 Max. bet 100
Jackpot Game No Max. win x12075 Bonus game No
Release Date 2021 Wild symbol Yes Multiplier Yes
Slot lines 10 Min. bet 0.1 Casino slot types Mobile slots, Video slots, New slots, 3D slots,
Volatility High Free spins Yes
Book of 99 slots online
Book of 99 slots online

Book of 99 Slot Online

Have you ever dreamed of joining the ranks of Odysseus and his heroic crew? Well, now’s your chance. We’re about to dive headfirst into the epic world of the Book of 99 slots, a game that’s nothing short of extraordinary.

Are you looking for the real deal in online slots? You’ve found it. Book of 99 by Relax Gaming offers good payouts, jaw-dropping features, and a sky-high RTP. Imagine battling the colossal Cyclops and going on an ancient Greek journey that’s as exciting as it gets.

Book of 99 boasts exquisite design and a straightforward 5-reel, 10-payline setup. But here’s the real gem: the Free Spins feature. Brace yourself because when that expanding symbol lands, the whole reel transforms, making your adventures even more rewarding.

So, are you ready to write your own Greek Odyssey with the Book of 99? Let’s venture on this epic journey together!

Advantages and Disadvantages

  • Excellent ancient history theme
  • Impressive 99% Return to Player (RTP) rate
  • Enjoy two distinct methods for triggering free spins
  • Solid potential to win up to 5,000x your stake
  • It could benefit from a greater variety of bonus features
  • The maximum win could be higher for more thrilling gameplay
  • The visuals could be a bit better

List Of The Best Online Casinos To Play Book of 99

  1. Rating Star 9.61

    Royal Panda Casino

    Welcome Package:

    100% UP TO 1000 EUR

    • Features:
    • License from MGA
    • Sportsbook section
    • A wide variety of casino games
  2. Rating Star 9.64

    Woo Casino

    100% UP TO 150C$

    + 150 FREE SPINS

    • Features:
    • Cryptos are accepted
    • Most withdrawal options are instant
    • Players can change the currency
  3. Rating Star 9.287

    BETLABEL Casino

    Coming Soon

    • Features:
    • Great loyalty program
    • Multilingual platform
    • More than 2,000 games available
  4. Rating Star 9.3

    Luckydays Casino

    Welcome Package:

    100% UP TO 500 CA$ + 100 FS

    • Features:
    • Safe & licensed platform
    • More than 2,000 casino games in several categories
    • Various payment methods
  5. Rating Star 9.55


    Welcome Package:

    100% UP TO 250 C$ + 30 FS

    • Features:
    • Internet gambling establishment with a solid reputation and seasoned management
    • Accessible in a variety of languages
    • Monday and Thursday incentives for topping out your account each week

First Impressions

You might be thinking, “Another ‘Book of…’ slot game? What’s so special about this one?” Well, let us tell you, the Book of 99 stands out for many good reasons. The game looks nice and also rewards your determination.

The RTP is higher than you usually find in the slot world. And when you combine that with the wild collection feature, you’ve got a game that’s not just well-designed but also seriously appealing.

Book of 99 slots carve out its unique place in the world of similar slots. Who said you need to reinvent something to create a great slot? If that special expanding symbol is in the mix, you’re in for an exciting ride!

Book of 99

Gameplay and Features

The Book of 99 slot’s gameplay is nice and simple. The main excitement comes from the enticing Free Spins feature, which introduces special expanding symbols. What sets it apart is the presence of not one but two distinct methods to trigger those coveted free spins.

Free Spins Feature

Landing three or more wilds on a single spin will trigger the Free Spins feature. The reward for your successful trigger is ten free spins. Just before these free spins take flight, one of the standard symbols gets chosen randomly to become the special expanding symbol for the entire feature.

Here’s where it gets even more thrilling – the special expanding symbol can create winning combinations on all ten paylines, irrespective of their connection. For instance, if you have expanding symbols gracing reels 1, 3, and 5, voilà, a winning combination occurs during the free spins!

The possibility for your maximum win depends on the symbol that assumes the role of the special expanding symbol:

The excitement doesn’t end there. Landing three or more wilds during the free spins will retrigger the feature, granting you another ten free spins. Much like other slots featuring a similar bonus mechanism, the sky’s the limit regarding the number of free spins you can enjoy.

Collection Feature

There’s a second, equally intriguing way to trigger the Free Spins round – the Collection feature. Whenever a wild symbol lands on the reels, it goes in a special meter to the left, named the Collection feature.

With every wild symbol you collect in the Book of 99 casino slot machine, you’ll embark on a treasure map adventure. Your ultimate goal is to gather a total of 99 wilds. Once you achieve this feat, you’ll trigger the free spins with the captivating special expanding symbol, much like the standard trigger.

After you’ve enjoyed your ten free spins, the meter resets, and you’re back on the path to collecting wilds. Your quest to reach 99 wilds begins anew, promising an engaging and ever-evolving gaming experience.

Visuals and Graphics

Book of 99 has a cool ancient Greek theme. It’s all about gods and ancient battles between good and evil. The graphics are top-notch, and you’ll meet legendary characters like the Cyclopes. It feels like being inside a comic book adventure. So, if you like excellent visuals and ancient myths, this game is a must-try!

Book of 99 Slot


Let’s talk about the game’s fantastic, mysterious background soundtrack. It’s not just the visuals that impress – the music is a delight for your ears.

Imagine a fast beat that gets your heart racing and an exotic melody that accompanies your gaming experience. It’s like being on your musical adventure while you play.

The soundtrack perfectly complements the game’s ancient Greek theme and adds excitement to every spin.

Paytables & Win Combos


Payout for 2Payout for 3Payout for 4

Payout for 5

100.5x bet2.5x bet

10x bet

J0.5x bet2.5x bet

10x bet

Q0.5x bet2.5x bet

10x bet

K0.5x bet4x bet

15x bet

A0.5x bet4x bet

15x bet


0.5x bet

3x bet10x bet

75x bet


0.5x bet

3x bet10x bet

75x bet


0.5x bet

4x bet40x bet

200x bet


1x bet

10x bet100x bet

500x bet

Book Wild/Scatter Substitutes  + Triggers Free Spins

Mobile Optimization

When it comes to mobile optimization, Book of 99 functions smoothly. It’s not just a game for computers; it’s available on all your favourite devices, from smartphones to tablets. You can enjoy Book of 99 play without download, on any operating system.

Whether playing on your phone during your lunch break or lounging with your tablet, you’ll experience the same classy design and cool gameplay in all versions. The impressive 99% RTP remains consistent, ensuring you get the same high-quality gaming experience, regardless of the device.

Demo Version

Good news for all curious players: Book of 99 slots offers a demo version! You can try it out for free before diving into the real deal. It’s a risk-free way to get a taste of the action, test the features, and see if it’s your kind of game. So, whether you are an experienced slot player looking to practice or a newbie eager to learn the ropes, the demo version is your perfect starting point.

About the Provider

Relax Gaming is the brains behind the Book of 99 slot demo and many similar top slots. Based in Malta, they’re not just a top-notch online slots provider. They also offer an open casino platform with games from other providers. What sets them apart is their dedication to crafting high-quality and captivating casino games.

Established in 2010, they’ve grown to open headquarters in various countries, earning awards for their innovation. When you play a Relax Gaming title like Book of 99, you’re in for a fantastic gaming experience from a globally recognized company.

The Provider’s Awards

Now, when it comes to awards, Relax Gaming has garnered a fair share of recognition in the industry. They’ve received accolades for their innovation and excellence in game development. Such an example is the Best Casino Content Supplier of the Year at the EGR Nordics Awards 2021.

Relax Gaming has consistently been on the radar for its impressive contributions to online gaming. So, it’s safe to say that you’re in good hands when playing a game created by Relax Gaming – they know what they’re doing!

Our Conclusion

Book of 99 isn’t your average ‘Book of’ game. Sure, it’s got the classic elements you love, but what sets it apart is that astounding 99% RTP rate – one of the best you’ll find.

With stunning visuals, engaging features, and the chance for epic wins, it’s a slot worth a spin, especially if you’re into ancient themes. You can also enjoy Book of 99 play free on some of our recommended online platforms.

Your key to big payouts? Snagging a high-value special expanding symbol during free spins could bring you anywhere from 100x to 5,000x your bet.

In conclusion, if you’re looking for an exciting gaming experience with the potential for big rewards, don’t miss out on Book of 99 — it’s a must-play!

Top 5 Reasons Why Book of 99 Gets Our 5 Stars

  1. Mind-Blowing RTP. It’s hard to beat the incredible 99% Return to Player rate. Your chances of winning big are simply off the charts.
  2. Stunning Visuals. The game’s captivating graphics transport you to an ancient Greek adventure with mythological creatures and gods. It’s a visual treat.
  3. Two Ways to Trigger Free Spins. With the unique Collection feature and classic free spins, you have double the chances to embark on a rewarding journey.
  4. Impressive Payouts. The special expanding symbol during free spins can lead to massive wins, ranging from 100 to an astonishing 5,000x your bet.
  5. Relax Gaming Quality. Developed by the renowned Relax Gaming, you’re in the hands of a provider with a track record of excellence and innovation.



Oliver Williams

Oliver Williams

205 Publications

View Profile

About Oliver Williams

Welcome to my world! I am Oliver Williams, and I'll be your guide in the universe of online casino games and betting on sports. I write my blog dedicated to online casinos and sports betting, and you’re invited to join me on this exciting journey.

More Relax gaming Online Slots

Similar Online Slots