Book of 99 Slot

"Mythologically Good Slot"


Book of 99 Slot Details

đź’¸Paylines 10
🔄RTP 99%
🎰Jackpot x
âž–Minimum Bet 0.1
âž•Maximum Bet 100
🏆Maximum Win 12075x Stake
🖥Software Provider Relax Gaming
🎨Themes Mythology
💎Design & Layout 5 Reel Slots Wild Symbol Scatter Symbol
Features Free Spins Bonus Round
MattJournalist at CasinoRange.comPublished DateMay 14, 2021 | Last UpdatedDecember 21, 2021

Book of 99 is a really simple yet pleasantly designed game, and the setting keeps in line with the theme. While it’s not exactly reinventing the wheel, it’s a solid entry into the ‘Book of’ gameplay series from Relax Gaming, and the free spins round is also something that is worth taking for a spin.


  • Incredible RTP
  • Great Graphics
  • Fun Free Spins Round
  • Simple Gameplay
  • Common Theme

Book of 99 Slot Review

Book of 99 is an exciting new instalment from Relax Gaming. With so many ‘Book of; titles now on the market, companies constantly look for ways to make their titles stand out. Thankfully, Book of 99 manages to do this thanks to an incredible RTP of 99%.

Like all slots using the ‘Book of’ mechanic, this is also set in a historic time. This time it’s the turn of Ancient Greece, with heroes and villains inhabiting the reels.

Graphics and theme

This is one of the newest slots on the market, but it is still sticking with a tried and tested them. The game leans heavily into Greek Mythology, with some greek columns bordering the reels and a nightside mountain range providing the backdrop. The music is very evocative and adds an air of mystery while you play as well.

The two main characters in the game are a female and male hero. They appear as two of the premium symbols on the slots, as well as a cyclops and a fairy-like creature. The rest of the symbols are the lower-paying card icons you can find on almost every slot. The character work on display in this slot is simple but effective – while the subtle animations do a great job of bringing them all to life.

Book of 99 Slot How to Play

Book of 99 has a very simple set-up. The action takes place on five reels across three rows, with the game offering a fairly average ten paylines. To play the game, users must choose their stake using the +/- buttons. The minimum that can be wagered is ÂŁ0.10, while the maximum is ÂŁ100. Once again, fairly average stuff.

What is not average about this game, though, is its RTP. The slot has a return to player of 99%, which should be more than enough for it to attract players. This, combined with the game’s maximum payout of 12,075x the stake, is a big selling point. The game also has a useful auto-spin feature which can take up to 100 spins.

Book of 99 on Mobile

Like the rest of the “Book of” series and most of Relax Gaming’s back catalogue, this slot is available on smartphones and tablets. The slot runs smoothly regardless of which operating system or browser you are using and is also supported by a selection of mobile casino applications.

Book of 99 Slot Bonus Round and Free Spins

There is a good selection of bonus features available in Book of 99. The main bonus here is the free spins round. There are two different ways to launch it. One is through the traditional way of landing three scatter symbols in one spin, while the other is to collect the symbols.

Every time a wild symbol is landed during the game, the collection meter will increase by one. When it reaches 99, 10 free spins are activated. Landing three scatter symbols will also launch the same amount of free spins and is much quicker to achieve.

During free spins, one symbol is randomly chosen to be the special symbol for the duration of free spins. If that symbol comes up, it will expand and behave like a wild symbol paying out on all ten lines on top of any normal wins acquired.

Wins involving the expanding symbol don’t have to be connected, so expanding symbols on the first, third and fifth reel offers a winning combination every time during free spins.

The max win depends on which symbol becomes the special expanding symbol. The male hero is the most valuable symbol in both modes. As an expanding symbol, he pays out 5,000 times your stake. He pays equal to one, 10, 100 or 500 times your total stake in normal gameplay, depending on how many you land.

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