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Relax Gaming
The Book of 99 slot reimagines the familiar "book of" format with a progression mechanic inspired by Greek mythology. The game is set among marble temples, mythical heroes, and ancient relics. The Book of 99 combines familiar expanding-symbol gameplay with an additional route to the bonus round by collecting books throughout the main game.
Rather than relying solely on 3 book symbols to unlock the feature, players can also trigger free spins by collecting 99 books displayed on the progress meter. Once the bonus round begins, one premium character is chosen at random to become the expanding symbol for the duration of the feature.
If you're looking to discover more mythology-inspired releases and classic favourites, you can explore the collection of online slots available at 7bet.
Prior to setting sail towards the legendary book collection, here's a brief look at the Book of 99 mechanics.
| Feature | Details |
| Provider | Relax Gaming |
| Game type | Video slot |
| Theme | Greek mythology |
| Reels | 5 |
| Bonus features | Book collection meter, expanding symbols, free spins, retriggers |
| Free spins trigger | 3 book symbols or collect 99 books |
| Maximum win | Up to 5,000× stake |
| Objective | Collect books and unlock expanding-symbol free spins |
The Book of 99 slot puts a different spin on familiar slots by introducing a 99-book collection mechanic alongside traditional expanding-symbol gameplay.
✓ Two verified bonus triggers provide multiple routes into free spins
✓ 99-book collection meter creates visible progression throughout the main game
✓ Random expanding symbol changes with every free spins feature
✓ Greek mythology setting offers a distinctive take on the classic "book of" format
✗ Reaching the 99-book target can take multiple rounds of progression
✗ The expanding symbol is selected at random before each bonus
From the opening spin, the Book of 99 presents a world inspired by Ancient Greece. Stone columns frame the 5 reels while carved temple walls, mountains, and evening skies create the backdrop. Instead of desert ruins or Egyptian pyramids, the game places players inside a classical sanctuary. Mythical creatures and legendary warriors appear across the reels.
The vertical book meter positioned to the left of the reels immediately stands out as one of the game's defining features. It continuously tracks every book collected during the main game, making visible progress towards one of the game's bonus triggers.
Unlike other slots, the Book of 99 introduces a second route into the free spins feature. Every book symbol collected during the main game contributes towards the book meter. Once all 99 books have been collected, the free spins feature is awarded automatically.
Players can also trigger the feature in the traditional way by landing three or more book symbols during the main game. Progress towards the book collection continues throughout regular play.
Once free spins begin, one premium character is selected at random to become the expanding symbol for the entire feature.
Whenever that chosen character lands on the reels during free spins, it expands to cover the full reel. This action creates additional opportunities to form winning combinations. The bonus begins with 10 free spins, while landing 3 or more book symbols during the feature awards another 10 free spins.
The Book of 99 fills its reels with symbols inspired by Greek mythology rather than traditional treasure-themed imagery. Alongside royal card symbols, players encounter powerful warriors and mythical female figures, monstrous creatures, and the distinctive glowing book that gives the game its name.
The setting takes place inside an ancient stone temple, where weathered pillars surround the reels. As the book count increases, the journey towards the next milestone becomes just as important as the individual winning combinations appearing on the reels.
The book collection mechanic is one of the defining features that separates the Book of 99 from many other slots. Every collected book advances the progress meter displayed beside the reels, gradually moving closer to the 99-book target.
Even after the traditional three-book trigger remains out of reach, the collection meter continues progressing towards the same free spins feature. This gives players a second verified path into the bonus round.
While the expanding symbol takes centre stage during free spins, several symbols shape the overall gameplay.
| Symbol | Function |
| Book | Acts as the bonus symbol and contributes towards the 99-book collection meter. Three or more books also trigger free spins. |
| Chosen premium symbol | Selected at random before free spins and expands to fill entire reels during the feature. |
| Premium character symbols | Form the highest-value regular winning combinations. |
| Royal card symbols | Lower-value symbols represented by A, K, Q, J and 10. |
Looking to begin your odyssey? Here's how to play the Book of 99 slot at 7bet casino.
The 99-book feature is one of the game's defining mechanics. Every book symbol collected during the main game is added to the book collection meter displayed beside the reels.
Once all 99 books have been collected, the free spins feature is awarded automatically. Free spins provide an alternative route to the bonus without relying solely on the traditional book symbol trigger.
There are two verified ways to activate free spins:
The feature begins with 10 free spins, and one premium character is randomly selected as the expanding symbol for the duration of the bonus.
The bonus begins with 10 free spins. Before the feature starts, one premium character is randomly chosen to become the expanding symbol. Whenever that symbol lands during free spins, it expands to fill the entire reel.
Landing 3 or more book symbols during the bonus awards another 10 free spins.
The Book of 99 slot features symbols inspired by Greek mythology and ancient legends, including:
During free spins, one premium symbol is randomly selected to become the expanding symbol.
The Book of 99 slot offers a maximum win of up to 5,000× your stake. Actual results vary from session to session, as every spin is determined independently.
Yes. The Book of 99 slot is available on compatible mobile phones, tablets, and desktop devices through the 7bet website. An internet connection is required to access the game.
Yes. While it includes familiar expanding-symbol gameplay, Book of 99 also introduces a 99-book collection meter that provides an additional way to trigger free spins.
This progression system gives players two verified routes into the bonus feature instead of relying solely on book symbols.
Yes. The Book of 99 slot may be available through the online casino at 7bet alongside a wide range of other slot games. Game availability can change over time, so players should check the current casino lobby for the latest selection.
Betting is only available to participants aged 18 years and over. Please gamble responsibly. BeGambleAware.org.