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Book of 99

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Book of 99
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Welcome Bonuses Welcome Bonuses
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Deposit bonus $500 + 200 free spins
Deposit bonus $500 + 200 free spins VISIT SITE
Deposit bonus $1,500 + 150 free spins
Deposit bonus $1,500 + 150 free spins VISIT SITE

Book of 99 Pros and Cons

  • Exceptional RTP: The 99% RTP is among the highest available, promising better returns over time.
  • Engaging Theme: Greek mythology theme with beautiful graphics and immersive sound design.
  • Unique Features: Wild collection system adds an extra layer of excitement and rewards persistence.
  • High Winning Potential: Up to 5,000 times the stake can be won in a single spin.
  • High Volatility: The game can experience long periods without significant wins, which may not suit all players.
  • No Side Payments for Scatters: Unlike many other slots, there is no immediate payout for landing three or more scatters.

Book of 99 Description

Book of 99, a captivating online slot machine by Relax Gaming, brings the ancient myths of Greece to life with an innovative twist on the popular ‘book of’ genre. Unlike many other slot games, Book of 99 distinguishes itself with an outstanding Return to Player (RTP) percentage of 99%, making it one of the most generous slots available. The game is built on a 5-reel, 10-payline structure and offers high volatility, ensuring that every spin is filled with excitement and potential for big wins.

The allure of Book of 99 lies not only in its rewarding RTP but also in its beautifully crafted visuals and engaging gameplay mechanics. The game features a mix of classic and novel elements, including expanding symbols during free spins and a unique wild collection system that adds an extra layer of anticipation to the gaming experience.

Book of 99 Theme

The theme of Book of 99 is steeped in Greek mythology, transporting players to a world of ancient gods, heroic figures, and mythical creatures. The game’s backdrop features a serene and sunlit landscape, reminiscent of the idyllic settings found in Greek myths. The symbols on the reels further enhance this theme, showcasing characters such as the cyclops, the fearsome Lamia, and both male and female protagonists styled as ancient heroes.

The overall aesthetic is complemented by a captivating soundtrack that blends rhythmic beats with exotic melodies, adding an immersive auditory layer to the visual splendor. The artistic design is cartoonish yet detailed, creating a unique and engaging atmosphere that draws players into the mythological narrative.

Book of 99 Mechanics

Book of 99 operates on a standard 5×3 reel grid with 10 fixed paylines. The game’s RTP stands at an exceptional 99%, a rarity in the world of online slots. This high RTP means that players can expect a better return on their bets over time compared to many other slot games.

Symbol Values

The game features both low-paying and high-paying symbols:

  • Low-Paying Symbols: These are the traditional card values (10, J, Q, K, A), intricately designed to match the game’s theme.
  • High-Paying Symbols: These include mythological characters:
    • The child-eating monster Lamia
    • A cyclops
    • A heroic male figure
    • A courageous female figure


Winning combinations are formed by landing matching symbols on adjacent reels, starting from the leftmost reel. High-paying symbols offer substantial rewards, with a full line of five symbols paying between 75 to 500 times the stake.

Bet Range

Players can place bets ranging from a minimum of 10 cents to a maximum of 100 dollars per spin, accommodating both casual players and high rollers.

Maximum Winnings

The maximum win potential in Book of 99 is significant, with players able to win up to 5,000 times their stake in a single spin, particularly during the free spins feature with expanding symbols.

Book of 99 winnings

Book of 99 Bonus Game

The bonus game in Book of 99 is a key highlight, offering players a chance to trigger free spins and significantly boost their winnings.


The bonus game can be activated in two ways:

  1. Landing Three or More Book Symbols: The book symbol acts as both the wild and the scatter. Landing three or more book symbols anywhere on the reels awards 10 free spins.
  2. Wild Collection System: Every time a wild symbol lands during the base game, it is added to a collection meter. Once 99 wilds have been collected, the bonus game is triggered, granting 10 free spins.

Bonus Game Process

Before the free spins begin, one of the regular pay symbols is randomly selected to become a special expanding symbol. During the free spins, if this special symbol lands, it expands to cover the entire reel after any regular wins are paid out. These expanded symbols pay out from any position on the reels, not just adjacent ones, increasing the chances of substantial wins.

Additionally, landing three or more book symbols during the free spins will retrigger the feature, providing even more opportunities to accumulate big wins.After any win, players have the option to enter a gamble round, where they can attempt to double or quadruple their winnings by guessing the color or suit of a face-down card.

Book of 99 Summary

Book of 99 stands out in the crowded ‘book of’ slot market with its exceptional RTP and engaging features. The game offers a visually appealing journey through ancient Greece, complemented by a thrilling bonus game that includes expanding symbols and a unique wild collection system. With high volatility and the potential for substantial payouts, Book of 99 is a compelling choice for both novice and experienced slot players.

Our rating 4.8 Ļoti labs Review
Welcome bonus

Deposit bonus $3,000

Welcome bonus
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Established: 2013
License: Kirasao (Curaçao)
Min deposit: 10 USD
Min withdraw: 10 USD
  • Wide selection of slots
  • Many Live casino game tables
  • The website is in Arabic language

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Mārtiņš Korulis
About the author Mārtiņš Korulis | Editor-in-Chief

With over a decade of experience in the gambling industry, encompassing both traditional and online gaming, the author has established themselves as a seasoned expert. What initially began as a simple hobby of crafting descriptions for casinos and online slot machines gradually evolved into a daily pursuit, consuming a significant portion of their time. Martins doesn’t limit their writing to online casinos alone, but also offers valuable insights into the world of sports betting. This extensive background ensures a wealth of knowledge and expertise in the field of gambling.


Frequently Asked Questions

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Book of 99