Book of 99 Free Play in Demo Mode and Game Review

Book of 99 review

Theme and Storyline

This slot is themed around classical Greek mythology.

Players will enter an enchanted land where cyclops, goddesses and epic heroes reside. Facing a rugged landscape and clear blue sea, players might feel like Odyssius on his adventures.

Mythology fans will be thrilled to find this magical slot and newcomers to mythology will love discovering its secrets.

Graphics, Sounds and Animations

The gentle soundtrack of waves, bird calls and whistling wind creates an immersive environment. The natural background noise is also so calming that most players will likely look forward to leaving it on. The reels land with a satisfying shuffle, accompanied by a mystical melody.

The reels are filled with intriguing characters, including a cyclops, a supernatural-looking siren and a hooded goddess. Each one seems to be fresh out of Homer’s Odyssey and players will want to join their adventure.

The backdrop is a breathtaking nightscape of a rocky island in a blue sea. Deep purple clouds drift overhead and ominous black birds occasionally fly by, adding a realistic feel to the world.

Overall, the beautiful animation and thoughtful soundtrack of this game transport the player right into a world of ancient mythology.


Book of 99 is a five reel, three row slot, with 10 win lines.

When the player lands 3 or more Wild symbols, the Free Spins feature is triggered, starting with 10 free spins.

During the Free Spins feature, a special expanding symbol is assigned at random. This symbol will have the ability to expand and provide more win opportunities.

Wilds, Bonuses and Free Spins

The Wild symbol substitutes for all symbols except the special expanding symbol, which appears during the Free Spins feature.

A collection meter moves along by one step every time the player lands a Wild symbol. Once the meter is filled, the Free Spins feature will be triggered.

Free spins triggered by the meter will be played at a bet level that corresponds to the average bet that the player made while collecting the Wilds.

Bet Sizes, RTP and Variance

The return to player of this game is 99%, well above our average yardstick of roughly 96%.

The range of bets on the site we tested ran from a minimum bet per spin of $/£/€0.10 up to a maximum of $/£/€100 per spin.

The volatility of this game is high, which makes it a good match for our preferred slot machine strategies. Our slot strategies target the highest possible volatility.


We recommend this very high RTP, high volatility mythology-themed slot.

With its sky-high RTP, there is no reason not to play this game. The high volatility and beautiful animation seal the deal, making this game an ideal choice.

The cleverly-themed bonus options add extra fun, ensuring that players stay engaged.

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