Book of 99 Slot Review

In this Book of 99 slot review, we delve into the intriguing world of Relax Gaming's high RTP game, inspired by Homer's Odyssey. With a staggering RTP of 99% and a maximum win potential of 12,075 times the stake, Book of 99 stands out in the realm of video slots. Its unique Book Collection feature and captivating theme, drawing from ancient Greek mythology, promise an enthralling gaming experience. Explore the journey of Odysseus and embark on an adventure filled with potential riches in Book of 99.

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Among all slots in 2024
Among slots on Ancient civilizations theme
Among all slots by Relax Gaming
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Book of 99 Attributes

Slot Overview: Journey Through Ancient Myths

Released on May 4, 2021, by Relax Gaming, the Book of 99 slot transports players back to the mystical era of ancient civilizations. Its design and theme are deeply rooted in Greek mythology, particularly the epic tale of Odysseus, offering a rich narrative backdrop that captivates players. The graphics are a harmonious blend of classical art and modern animation, bringing ancient Greek characters and symbols to life in a visually stunning manner. The reels are set against a backdrop that evokes the feeling of an ancient manuscript, complete with traditional Greek patterns and designs.

The symbols in Book of 99 are meticulously crafted, featuring iconic figures from Greek mythology such as the cunning hero Odysseus, the enchanting Siren, and the formidable Cyclops. Each symbol is designed with attention to detail, contributing to the overall immersive experience. The soundtrack, too, is carefully chosen, with melodious tunes that complement the ancient theme, enhancing the gaming experience.

The user interface is intuitive, allowing players to easily navigate through the game, regardless of their experience level with slots. This attention to detail in both the visual and auditory aspects of Book of 99 creates a unique gaming experience that not only entertains but also transports players back to the age of ancient Greek legends.

Book of 99 Game

Before spinning the reels, players choose their bet size. The game accommodates a wide range of bet sizes, making it accessible to various types of players. Once the bet is set, players can start the game by clicking the spin button. There's also an autoplay feature, which allows players to set a predetermined number of spins at a constant bet level.

The game's unique feature is the Book Collection mechanism. Players collect books as they play, and gathering 99 books triggers the Free Spins feature. This feature not only enhances the gaming experience but also increases the chances of significant wins. During the Free Spins round, a special expanding symbol is randomly chosen, which can cover entire reels, leading to potentially larger payouts.

Another key aspect of Book of 99 is the Wild symbol, represented by the Book. This symbol substitutes for all other symbols, aiding in forming winning combinations. Moreover, the Book symbol acts as both a Wild and a Scatter. Landing three or more Book symbols on the reels triggers the Free Spins feature, adding an extra layer of excitement to the gameplay.

In summary, Book of 99 combines traditional slot mechanics with innovative features, creating an engaging and potentially rewarding gaming experience. Its straightforward rules, combined with unique elements like the Book Collection and expanding symbols during Free Spins, make it a standout choice in the realm of online slots.

Gameplay Mechanics: Delving into the Depths of Ancient Strategy


In Book of 99, the symbols are central to its theme, featuring characters and items from Greek mythology. The high-paying symbols include the hero Odysseus, the Siren, the Cyclops, and a Greek warrior. The lower-paying symbols are the classic card values, from 10 to Ace, designed in a style that complements the ancient Greek theme.

Free Spin Bonus

The Free Spin Bonus in Book of 99 is triggered either by collecting 99 book symbols over time or by landing three or more Book symbols on the reels in a single spin. Players are awarded 10 free spins, during which a random symbol is selected to become an expanding symbol. This symbol can expand to cover entire reels, significantly increasing the potential for big wins.

Max/Min Bet

The betting range in Book of 99 is designed to cater to a wide variety of players. The minimum bet is typically set at a low value, allowing players with smaller bankrolls to enjoy the game. On the other hand, the maximum bet is significantly higher, offering high rollers the chance to place larger bets. This range ensures that Book of 99 is accessible and enjoyable for all types of players, from casual to serious gamblers.

In conclusion, the gameplay mechanics of Book of 99 are thoughtfully designed to provide an engaging and immersive experience. The game's symbols bring the ancient Greek theme to life, while the Free Spin Bonus adds an exciting dimension to the gameplay. The wide betting range makes the game accessible to a broad audience, ensuring that both new and experienced players can enjoy the journey through ancient mythology.

RTP, Variance, and Winning Potential: Unearthing Ancient Fortunes

The Book of 99 slot stands out with an exceptionally high Return to Player (RTP) rate of 99%, a rarity in the world of online slots. This high RTP implies that over a long period of gameplay, the game returns 99% of the wagered money to players, on average. It's important to note that RTP is a theoretical value and does not guarantee individual session outcomes.

The game also features high variance, meaning that wins may be less frequent but have the potential to be larger when they occur. This high variance aligns well with the adventurous theme of the slot, offering players a chance at significant payouts, akin to uncovering hidden treasures of the ancient world.

In terms of winning potential, Book of 99 does not disappoint. Players have the opportunity to win big, especially during the Free Spins feature where the expanding symbols can lead to substantial payouts. The maximum win potential, although not specified, is understood to be high, resonating with the game's high variance nature.

Overall, the combination of a high RTP, high variance, and strong winning potential makes Book of 99 an attractive option for players seeking both excitement and the chance for substantial rewards. This balance is a testament to Relax Gaming's commitment to creating engaging and potentially lucrative gaming experiences.

Tips and Strategies: Mastering the Secrets of Ancient Riches

When playing Book of 99, it's important to remember that while strategies can enhance the gaming experience, the outcome is largely based on luck due to the game's high variance nature. However, there are some tips players can consider to potentially improve their gameplay:

  1. Understand the Paytable: Familiarize yourself with the game's paytable. Knowing which symbols are more valuable can help in recognizing the more lucrative opportunities.

  2. Manage Your Bankroll: Set a budget before you start playing and stick to it. Due to the high variance, it's crucial to manage your bankroll effectively to endure longer gameplay periods.

  3. Aim for the Free Spins: The Free Spins feature, triggered by collecting books or landing Book symbols, is where the game’s potential really shines. Targeting this feature can be a strategic approach, although it requires patience.

  4. Play for Fun: Remember that slots are a form of entertainment. Play for enjoyment rather than the sole purpose of winning money.

  5. Practice with Free Play: If available, try the free play version of the game to get a feel for it before investing real money.

Remember, there's no guaranteed strategy to win in slots, but these tips can help in making informed decisions while enjoying the game.

Exceptionally high RTP of 99%, offering better long-term player returns.
Engaging theme based on Greek mythology, enhancing the overall gaming experience.
Free Spins feature with expanding symbols increases winning potential.
Book Collection mechanism adds a unique twist to gameplay.
High variance might not suit players who prefer frequent, smaller wins.
Limited features compared to some other modern slots.
The theme might not appeal to players who prefer more contemporary or different thematic slots.
Maximum win potential is not clearly specified, which might deter players looking for guaranteed high payouts.

Wrapping Up the Odyssey of Book of 99

In conclusion, Book of 99 by Relax Gaming is a standout slot game with its unique blend of a high RTP, engaging Greek mythology theme, and innovative gameplay features. The high RTP of 99% is a rare find, offering players a potentially lucrative gaming experience. The game's high variance might be challenging for some, but it also adds to the excitement and allure for those seeking substantial wins. The immersive theme and the Free Spins feature with expanding symbols further enhance the appeal of the game. While it may not cater to every type of player, Book of 99 offers a distinctive and enjoyable experience for those drawn to its ancient civilization theme and gameplay mechanics.


What is the RTP of Book of 99?
The RTP (Return to Player) of Book of 99 is 99%, which is exceptionally high for a slot game. This means players can expect a high return over a long period of play.
Can I trigger Free Spins in Book of 99?
Yes, you can trigger Free Spins in Book of 99 either by collecting 99 book symbols over time or by landing three or more Book symbols on the reels in a single spin. This awards 10 free spins with a special expanding symbol.
Is Book of 99 suitable for high rollers?
Book of 99 caters to a wide range of players, including high rollers. The game offers a high variance and a broad betting range, making it appealing for players looking for bigger risks and rewards.
What is the theme of Book of 99?
The theme of Book of 99 is based on Greek mythology, particularly focusing on the epic tale of Odysseus. The game features symbols and a backdrop that reflect this ancient civilization theme.