Book of 99 Slot Review

How to Win at Book Of 99

Wins in the base game of Book of 99 happen the conventional way. Land three or more matching symbols on a payline (two in some cases) to secure a win. The Scatter Wild symbol (which is the book) can also help with winning combinations. As it is also the scatter, the wild will substitute for all other symbols, hence making winning combinations easier to land during both the base game and the bonus round.

The jackpot potential comes in the Free Spins feature thanks to the expanding symbol (although it is technically possible in the base game). If all reels are filled with the highest value symbol (The Greek Hero) then the 500x stake win for five of a kind will occur on all 10 paylines, giving a 5,000x bet payout.

If you’re playing the maximum of £100 per spin at this point, then the highest possible win is a staggering £500,000, which is a life-changing sum for anybody.

Book Of 99 Pay Table & Paylines

Basic Info 2 Symbols 3 Symbols 4 Symbols 5 Symbols

Greek Hero
1 10 100 500

0.50 4 40 200

0.50 3 10 75

0.50 3 10 75

0.5 4 15

0.5 4 15

0.5 2.5 10

0.5 2.5 10

0.5 2.5 10


Wilds substitute every symbol except Scatter


RTP & Volatility in Book Of 99

The return-to-player percentage (RTP) of a slot game is the average payout expected over infinite theoretical spins. While a good way of judging a slot’s generosity, the RTP should not be considered a guarantee of a game’s payout habits.

The remarkably high RTP of 99% ensured this slot made a quick impact amongst online slots fans. That means the slot will (on average) pay £99 for every £100 wagered. With the expected RTP of online slots being around 95-96%, this Relax Gaming slot is well above the industry standard and therefore provides big win potential.

While the RTP of a slot focuses on what it pays out, the volatility (or variance) focuses on the how. A high volatility slot may have long waits between payouts, but pays big when it does. Low variance games will reward players little and often. Again, this is an average and not a guarantee.

Book of 99 has extremely high volatility, which means players with a large enough budget and patience to play an extended session are most likely to win big here. There’s no pattern due to the random nature of the slot. One day the jackpot may hit on its second spin, the next it can eat up your bankroll, with no wins at all.

How Does Book Of 99’s Winnings Compare to Other Slot Games?

A 5,000x bet is a decent payout for a slot. It isn’t the highest, and there are bigger wins to be found, but it’s still a jackpot worthy of a player’s attention. If you’re looking for a high RTP slot with a higher maximum win, we suggest Scientific Games’ Gold Fish.

When compared to other Relax Gaming slots, Book of 99’s jackpot payment ranks as average. However, two popular slots from the developer — Wild Chapo (10,000x et) and Money Train 2 (50,000x bet) — both rank higher when it comes to maximum payouts.

Book Of 99 Reviews by Players

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  • Large variety of games
  • High payout percentage

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