The Alluring Features Unveiled: A Comprehensive Book of 99 Slot Review

The Epic Book of 99 Slot: A Greek Mythology-Themed Game with Massive Winnings

Step into the captivating world of Greek mythology with the Book of 99 slot game. This thrilling and highly volatile slot offers a jaw-dropping 99% Return to Player (RTP), surpassing most other slots in the market and drawing the attention of even the most experienced slot enthusiasts. With its Wild Scatters, Free Spins feature, and an intriguing random Expanding Symbol, Book of 99 has plenty to offer. In this comprehensive review, we explore the captivating features and gameplay of this epic Relax Gaming slot.

The Best Casinos to Play Book Of 99

Before we dive into the captivating features of Book of 99, let’s take a moment to explore the best casinos where you can play this thrilling game. For an exceptional gaming experience, we meticulously check for proven security measures, ensuring that your personal and financial information is handled with utmost care.

In our review process, we also consider the reputation of each betting site. We speak with gamblers and industry experts to uncover every detail about the site’s relationship with its players. Additionally, we prioritize safety and security, ensuring that all recommended sites are legitimately licensed and regulated, providing the best encryption technology to safeguard your data.

Banking options are crucial for an enjoyable gambling experience, so we thoroughly evaluate the range of secure payment methods offered by each site. From fast withdrawals to high payout percentages and a fair return to player (RTP), we ensure that our recommended sites meet the highest standards in banking and payments.

Furthermore, we examine the bonuses and promotions offered by each site to ensure that new players are greeted with a generous welcome bonus and that loyal players are rewarded with exciting promotions. We also carefully review the terms and conditions to ensure fairness, so you can bet with confidence.

Customer support is essential, so we assess the level of customer service at each site. We value extensive customer support and place great importance on efficient and reliable assistance when needed.

Compatibility is another crucial factor in our evaluation process. Our top recommendations are compatible with various devices, ensuring that you have the freedom to play anytime and anywhere.

When it comes to the online experience, we seek out sites that offer a wide range of games or sports to bet on. We believe in providing players with options, whether it’s playing for free or choosing between different software providers. Additionally, we expect our partners to meet high standards in graphics and localization to accommodate players from around the world.

How to Play Book Of 99 Online

Book of 99 features a Greek mythology theme with five reels, three rows, and 10 static paylines. The game revolves around its captivating Free Spins feature, which includes a unique expanding symbol. This feature is triggered conventionally and through the scatter meter at the side of the screen. Despite the relatively generic imagery, the graphics and animations are beautifully executed, capturing the essence of Greek mythology through crisp and eye-catching visuals.

Basic Info

Type: Video Slot

RTP: 99%

Developer: Relax Gaming

Mobile Friendly: Yes


Free Spins: Yes

Bonus Round: No

Multiplier Bonus: No

Gamble Feature: No


Reels: 5

Rows: 3

Paylines: 10

Volatility: High

Theme: Ancient Greece


Autoplay: Yes

Adjust Paylines: No

Highest Payout: 5,000x

Minimum Bet: 10p

Maximum Bet: £100

Before embarking on your Book of 99 slot adventure, you need to choose your bet amount, which can range from a minimum of 10p to a maximum of £100 per spin. With fixed paylines, there will always be 10 in play. Once your bet amount is set, you’re ready to spin the reels.

Book of 99 offers a higher volatility compared to most slots, making it suitable for high rollers who have the patience to wait for big wins. However, the low minimum bet also allows players with smaller budgets to try their luck. With a remarkable 99% RTP, anything is possible in this epic Greek mythology-themed slot.

How to Win at Book Of 99

Wins in the base game of Book of 99 happen in the conventional way. Form winning combinations by landing three or more matching symbols on a payline (or two in some cases). The Scatter Wild symbol, represented by the book, also contributes to winning combinations as it substitutes for all other symbols. This feature enhances your chances of landing winning combinations both in the base game and the bonus round.

The jackpot potential of Book of 99 lies within its Free Spins feature, thanks to the expanding symbol. If all reels are filled with the highest value symbol, known as The Greek Hero, you’ll win 500 times your stake for five of a kind on all 10 paylines, resulting in a massive 5,000 times your bet payout. For players betting the maximum of £100 per spin, the highest possible win is an astounding £500,000, a life-changing sum for anyone.

Book Of 99 Pay Table & Paylines

Wild: Wilds substitute every symbol except Scatter

For a detailed overview of the paylines and rewards in Book of 99, refer to the game’s pay table.

RTP & Volatility in Book Of 99

The return-to-player percentage (RTP) of a slot game represents the average payout expected over an infinite number of theoretical spins. While the RTP provides insight into a slot’s generosity, it should not be considered a guarantee of a game’s payout habits. The exceptionally high RTP of 99% sets Book of 99 apart, making it a favorite among online slots fans. This means that on average, the slot will pay out £99 for every £100 wagered, far exceeding the industry standard RTP of around 95-96% and offering significant win potential.

Variability, or volatility, focuses on how a slot pays out. High volatility slots tend to have longer gaps between payouts, but when a win occurs, it tends to be substantial. Low volatility games, on the other hand, offer frequent, but smaller wins. Book of 99 boasts extremely high volatility, making it ideal for players with a sizable budget and the patience to engage in extended gaming sessions. Due to the random nature of the slot, there is no discernible pattern in payouts. The jackpot may be triggered within just a few spins or require a more prolonged session of play.

When comparing Book of 99’s winnings to other slot games, a 5,000 times bet payout is respectable. While there are slots with higher maximum wins, Book of 99’s jackpot is appealing and worth players’ attention. If you seek a high RTP slot with an even greater maximum win potential, we recommend exploring Scientific Games’ Gold Fish. Among other Relax Gaming slots, Book of 99’s maximum payout falls within the average range. However, Wild Chapo (10,000 times bet) and Money Train 2 (50,000 times bet), two popular slots from the developer, offer even higher maximum payouts.

Book Of 99 Slot Bonuses

In addition to the Wild Scatter symbol, Book of 99 features a captivating Free Spins round as its primary bonus feature. Triggering 10 free spins conventionally requires landing three Scatter symbols, as is the standard in slot games. However, there is an alternative way to trigger the Free Spins feature. Each time a Wild Scatter symbol appears on the reels, it is collected and added to a counter located at the side of the screen. Once the counter reaches 99, the Free Spins feature is triggered. This function caters to players who seek extended gameplay and enjoy spinning the reels for a more extended period.

Upon triggering the Free Spins feature, a special Expanding Symbol is randomly selected. This symbol expands to fill the reels during the feature, creating more opportunities for winning combinations. If a high-value symbol is chosen, such as The Greek Hero, two or more of this symbol constitute a win and can bring substantial profits. With three or more Scatter symbols, the feature can be retriggered, and there is no limit to the number of retriggers.

Play Book Of 99 Online for Free

If you want to familiarize yourself with the gameplay and features of Book of 99 without risking real money, free slots are an excellent option. Playing the Book of 99 demo version available here allows you to explore this slot and similar titles with similar gameplay features. The freeplay version offers you the freedom to enjoy Book of 99 purely for fun and get a feel for its attractive visuals and captivating soundtrack.

Play Book Of 99 on Android or Apple

Relax Gaming is celebrated for its outstanding mobile slots, and Book of 99 is no exception. The bold yet simplistic graphics translate seamlessly to smaller screens. The user interface of Book of 99 mobile has been optimized for easy navigation and smooth playability on smartphones and tablets. Whether you choose to play through your device’s web browser at your favorite mobile-friendly casino or via a downloadable app for Android or Apple devices, you can expect a seamless and lag-free gaming experience wherever you go. Book of 99 mobile offers the same Free Spins feature, betting limits, expanding symbols, and Scatter Wild symbols as the desktop version, along with the same staggering jackpot of £500,000. If you seek an enjoyable mobile casino experience that retains its quality on a small smartphone screen, Book of 99 is an excellent choice.

Similar Slots to Play Online

Greek mythology has long been a popular theme for online slots, and as a result, numerous top developers have released their own versions. This abundance of choices allows players to find their favorite Greek mythology-themed slot, ranging from Megaways and progressive jackpots to various paylines, jackpots, and bet limits. If you’re looking for a top-quality slot offering Greek mythology excitement, you’re guaranteed to find one that suits your preferences. While Book of 99 is an excellent choice, we would be remiss if we didn’t mention a few other exceptional titles in this genre:

  • Divine Fortune by NetEnt with an impressive RTP of 96.59%
  • 300 Shields by NextGen, offering an RTP of 95.3%
  • Hot as Hades by Microgaming, featuring an RTP of 96.75%

Book Of 99 Online Review

At first glance, Book of 99 may not appear to be a unique slot, given the abundance of Greek mythology-themed games available. However, it is the exceptional features that set Book of 99 apart. Starting with the highly appealing RTP, this game stands out with a remarkable 99%, surpassing most slots in terms of return to players and attracting ardent online slots fans. The impressive RTP combined with the high volatility of the game promises significant winning potential, although players should be aware that frequent wins may not occur.

Another noteworthy aspect of Book of 99 is its captivating graphics. While the theme may be familiar, Relax Gaming’s expertise in producing crisp and visually striking graphics allows the game to stand out from similar Ancient Greece-themed slots. The stunning imagery and animations create an immersive experience unmatched by other titles in this genre.

Overall, we rate Book of 99 as an 8 out of 10. For more information about our assessment and grading of casinos and games, please check out our “How We Rate” page. We work closely with independent regulatory bodies to ensure that every player experiences a secure and reliable gaming environment.

Player Reviews of Book Of 99

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Top Rated Sites

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Our Rating: 9.2/10


What is the RTP of the Book Of 99 slot game?

The Book of 99 slot game boasts an astonishing RTP of 99%. This means that, hypothetically, £99 can be won for every £100 staked.

Can I play Book Of 99 slot game for free?

Yes, absolutely! Demo games provide an excellent opportunity to familiarize yourself with a slot’s gameplay and features before you venture into betting real money.

Where can I play a demo of the Book Of 99 slot game?

Right here! You can play the demo version of the Book of 99 slot on our site. We offer freeplay versions of various slots, ensuring that you can always try a game before deciding to play with real money.

What is the maximum win on the Book Of 99 slot game?

The maximum win available in the Book of 99 slot game is an astounding £500,000. Achieve this by landing the highest 5,000 times your stake win while betting the maximum amount of £100 per spin.

Can I get free spins on the Book Of 99 slot game?

Absolutely! You can trigger the Free Spins feature in the Book of 99 game by landing three Scatter symbols. Additionally, some online casinos may offer free spins as part of promotions specifically for this Relax Gaming slot title.

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