Game description

Book of 99 Slot (Relax Gaming)

Book of 99 Slot (Relax Gaming)The new Book of 99 title is the latest game from Relax Gaming, and it offers a high RTP percentage to players.

This slot has a Greek-inspired theme with various legendary figures and mythology as its focus.

The developers are looking to create an immersive experience that can be enjoyed by all who play this slot game.

Book of 99 offers various bonuses, symbols, themes, and features to provide plenty of entertainment for those who enjoy playing games in this genre.

I had a great time playing the slot for real money and here is my unbiased review:

Game Set-up

The Book of 99 is a 5x3 reel slot with 10 lines. It offers the usual high volatility, and also includes a number of special features.

Features include Book wild/scatters, and free spins, and expanding symbols.

Betting and Prizes

Relax Gaming is a bit flexible with this slot, and you can use as little as $0.10 per spin. The maximum amount allowed on each spin is $100.

Slots with Book-style mechanics tend to offer great payouts, and it’s not a surprise that Book of 99 offers up 5,000x the stake.

The most surprising thing to me, and probably to many other gamers is the fact that this slot offers a 99% RTP.

Book of 99 Slot Features

It has the scatter symbol, which can be used as wild or as a substitute. If it lands at least 3 times on the same line then you will get free spins.

With 3+ scatters appearing on the reels, Book of 99 can reward you with up to 10 free spins. You can also use it to substitute the regular symbols.

Theme & Design

The Book of 99 is a game based on Ancient Greece, with symbols that include a male and female, Lamia, Cyclops and Royals. The story is told many times before in one form or another.

Overall, I cannot say that I’m quite pleased with the graphics that Relax Gaming has used here, especially after noticing that they have copied a lot of it from previous developers.

However, I give credit to the top symbols that were well-designed.


The Book of 99 is a very interesting game because it is the only one that offers an RTP (return to player) rate of 99%. It might not be realistic for every individual player out there, but enough people will play it just for this advantage.

Overall, it's a good slot and I can recommend it to all levels of players.

UPDATED ON: by James Worden