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Book of 99[Relax Gaming]


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Title:  Book of 99
Developer: Relax Gaming
Reels: 5
Rows: 3
Paylines: 10
RTP: 99.0%
Free Spins Freq: N/A
Max Win: 12,075x
Max Win Probability: N/A
Volatility: High
Min/Max Bet: 0.20/200
Release Date: May 4, 2021


Now Play :https://k8.io/games/slots/rlx_bookof99


Book of 99: Slot Overview

To stand out in the unstoppable deluge of slots, designers really have to do something special. Maybe pick an unusual theme, jack the potential, or put thinking caps on to come up with trailblazing features no one has seen before. Developer Relax Gaming has chosen to do none of these things. As you can deduct from the title, Book of 99 is another 'book of' style game – this time set in Ancient Greece. Even potential is pretty standard for this type of game. What they've done, though, is attach an eye-catching RTP value that relates to the title, as well as add a generous collection system.

book of 99.PNG

Book of 99 is also a nice game to look at, maybe not quite so much in the base game, but the bonus game plays in a sun-drenched easy on the eyes arcadia. There's a definite Relax feel to the rest of the game too via the cartoonishly designed symbols depicting various heroes and villains from the old glory days. Some are downright creepy (looking at you scary lady). The music is nice too, composed of a throbbing beat and a melody which adds a touch of exoticism to the proceedings.


Highly volatile, the Greco action takes place on a classic 'book of' reel set made out of 5 reels and 10 fixed paylines. Stakes may be set from 20 p/c at the lower end, rising to £/€200 for higher rollers, on any device. The unique selling point around here is the game's RTP configuration. Rarely do we see figures so high, and Relax bucks the downward trend by blessing Book of 99 with 99% RTP. Call it what you like – a gimmick, a trick to pull in punters; at the end of the day, it's a stellar value, making Book of 99 head and shoulders more desirable than many in the 'book' category.


Starting from reel 1, winning combinations are formed when matching symbols sit adjacently to each other on a payline. In this Greek odyssey, you'll find a group of attractive 10-A symbols at the lower end of things and higher-paying symbols, including a child-eating monster named Lamia, a cyclops, plus female and male leads. Low pays need at least 3 to make a winning combo, while high pays dish out coins for 2 or more. Should a line of 5 premium symbols line up, players collect a win worth 75 to 500 times their stake, making full screen wins particularly thrilling.


Book of 99: Slot Features
In the Book of 99 slot game, the gameplay is straightforward. Free spins with special expanding symbols are the main feature offering. Slightly unusually, there are 2 ways to trigger the free spins.


book of 99 1.PNG

Free Spins feature

Land 3 or more wild symbols on the same spin to activate the Free Spins feature. Your reward here is 10 free spins. Before the free spins begin, 1 of the standard symbols is picked at random. This will be the special expanding symbol for the whole of the feature.

On each free spin, a standard payout consideration is made. If a special symbol lands, it expands to fill the whole of the reel. In addition to standard payline wins, the special expanding symbol can pay out on all 10 paylines depending on how the symbols fall.

Winning combinations made up of the expanding symbol don’t have to be connected either. For example, expanding symbols on reels 1, 3 and 5 would result in a winning combination being formed in the free spins. Now, your max win depends on which symbol becomes the special expanding symbol:

book of 99 3.PNG

Collection feature

There’s a second way to trigger the Free Spins feature. Each time a wild symbol lands, it’s collected in a meter to the left of the reels. This is called the Collection feature.

With each wild, you’ll progress along a treasure map. When you have amassed 99 wilds, you’ll trigger the free spins. These come with the expanding symbol just like in a standard trigger. When you’ve played out your 10 free spins, the meter resets and you’ll start collecting wilds once again on a quest to reach 99.

book of 99 2.PNG


Book of 99: Slot Verdict

Book slots might be a dime a dozen, but Relax's contribution to this preeminent slot category comes with several convincing reasons why you would choose this over its competitors. RTP is obviously one of the main reasons, making Book of 99 one of the most generous slots out there. As a go-to for powering through a wagering requirement, it's hard to think of a better option. Book of 99 would be a great way to maximise your chances of getting returns in this situation - whether operators will play ball and offer it up for this purpose will be interesting to see.


Aside from its unusually high RTP, Book of 99 is a high quality 'book of' slot in its own right. For one, it looks nice, and the wild collection system is an extra sweetener on top. It adds a sense of purpose as well as a reward for persistent players. Even if getting 3 scatters to appear simultaneously is a chore, eventually, 99 of them will pass by, leading to free spins. That also raises the question, how much of that RTP is allocated to the base game and free spins respectively? Is the exceptionally high RTP a blessing or a curse? There's always a risk that wading through long base game sessions will eventually start turning into a chore. Part of what has made Book of Dead so successful, is its perfectly balanced math model.


At the end of the day, higher than normal RTP, plus a wild collection feature, makes Book of 99 a well-designed, attractive entry in the bloated 'book' market. Once again, it seems reinventing the wheel isn't a requirement for making a decent slot – provided there is an expanding special symbol in there somewhere.

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