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Book of 99 is a pokie by Relax Gaming released in 2021. It uses classic Book-style imagery with ancient artefacts, a mystical book, adventure-themed artwork and a high RTP that became the main distinguishing feature of the game.

The game area consists of 5 reels and 3 rows with 10 paylines. The theoretical RTP is 99.00%, which is noticeably higher than the average for online pokies. Volatility is high, the betting range is usually listed as 0.10 to 100 and the maximum win reaches 12075x the bet.

Game features

• Wild symbols
• Scatter symbols
• Free Spins
• Expanding Symbols
• Bonus Meter
• Symbol Collection

The main special symbol is the book. It has two functions: it substitutes for standard symbols as a Wild and triggers free spins as a Scatter. Landing 3 or more Book symbols activates the Free Spins bonus.

The game also includes a meter that collects Wild symbols. Every Book/Wild that appears is added to the Bonus Meter. Once the count reaches 99 collected symbols, the player gains entry to the bonus mode even without the standard Scatter combination.

Bonus mechanics

Free Spins are the key feature in Book of 99. At the beginning of the bonus, a special symbol is selected. During the free spins, it can expand across the reels. When enough instances land, the symbol opens out and helps form additional payouts on active paylines.

Expanding Symbols make the bonus round the main source of larger win potential. The strongest results may occur when one of the high-paying symbols is selected as the expanding symbol.

Bonus Meter adds a longer-term objective. Even when 3 Scatters do not trigger the bonus immediately, each collected Wild moves the player closer to the next Free Spins round. This gives Book of 99 a more progressive feel than many traditional Book pokies.

Theme and style

The pokie uses an adventure style inspired by ancient treasure, a mystical book and the traditional Book of genre. The reels display characters, artefacts, the book, card symbols and special bonus icons. Book of 99 belongs to the categories of Egyptian pokies, Book pokies and video pokies.

The visual style remains clear and traditional, with a 5×3 layout, 10 paylines, large symbols and a familiar bonus structure. The main emphasis is not on complicated mini-games but on the high RTP, collecting books and free spins with an expanding symbol.

Popularity among players

Book of 99 is popular with players from the United Kingdom, Canada, Germany, the Netherlands, Norway, Sweden, Finland, Denmark and New Zealand. It may appeal to users who enjoy Book-style mechanics, high RTP, free spins and a simple structure without excessive extra modes.

The pokie suits players who prefer high volatility, fixed paylines, a Wild/Scatter book and a bonus round in which expanding symbols provide the main potential.