RTP: 99%
Provider: Relax Gaming
Best casinos: Duelz, LeoVegas Casino, Pub Casino, Casushi, Unibet Casino
In this review: summary
- Overview
- Slot Details
- Theme, Audio + Symbols
- Bonus Features
- Expert Verdict
- Other ‘Book of’ Slots
- Editorial Information
Book of 99 Key Features
RTP: 99%
Provider: Relax Gaming
Volatility: Very High
Theme: Ancient Greece
Reel style: 5
Paylines: 10
Stakes: 10p to £100
Max Win: 5,000x
Free Spins
Retriggers
Expanding Symbol
Collection
Overview
Rewrite history and battle amongst the gods in the Book of 99 slot from Relax Gaming. With 5 reels and 10 paylines, you can play on all devices from just 10p a spin.
This Greek odyssey is all about the Free Spins feature where you begin with 10 free spins and a randomly chosen special expanding symbol. Whilst this is pretty standard, there is a unique Collection feature which sees you play the free spins when you’ve accumulated 99 Book Wild/Scatter symbols.
With 5,000 times bet max wins, what sets Book of 99 apart from countless other ‘Book of’ slots is its 99% RTP rate. Find out which slot sites you can play the game at with our in-depth review and free play demo.
Book of 99 Slot Demo
Casinos that offer Book of 99 slot sorted by RTP
£100 Bonus + 100 Free Spins
- Wagering req. 30x
- Value/free spin £0.10
- Offer amount £110
Min deposit: £20. Max £100 bonus. Max bet with active bonus: £2. Wagering required 100% match bonus: 30x deposit + bonus. Max win from welcome bonus: £500. 100 Free Spins are given out 20 per day on Book of Dead for 5 days in a row. Max Free Spins winnings: £100. Free Spins winnings credited as bonus money with 45x wagering & 3 days expiry. Deposit bonus & Free Spins wins are forfeited 30 days after bonus is credited if the wagering is not met. Game weighting and restrictions apply.
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100% up to £100 Welcome Bonus
- Wagering req. 40x
- Value/free spin -
- Offer amount £100
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- Wagering req. 50x
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- Offer amount £35
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100% up to £200 + 100 FREE Spins
- Wagering req. 35x
- Value/free spin £0.10
- Offer amount £200
New reg only. Opt in & deposit either £10, £25 or £50 within 7 days & further 7 days to wager your deposit 35x to unlock reward (up to £50 for each of your first 2 deposits). Wagering/game contributions vary. 25 x 10p wager-free spins added to Big Bass Splash with each qualifying deposit, 3 day expiry. Other Promotional Play Restrictions Apply. T&Cs apply. 18+ BeGambleAware.org.
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100% Welcome Bonus + 50 Bonus Spins!
- Wagering req. 40x
- Value/free spin £0.10
- Offer amount £55
18+. £10+ first deposit required. Spins on Big Bass Splash credited over 3 days. 40x wagering. Bonus funds used when cash funds are 0. Cash withdrawal voids bonus. Max cash out £250. Expiry: 30 days Deposit Bonus, 2 days Spins. Game & Deposit restrictions. Full Terms Apply.
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Slot Details
The Book of 99 slot game has 5 reels, 3 rows and 10 fixed paylines. As simple as online slot games come, landing 3, 4 or 5 matching symbols across any payline, from left to right and beginning from the leftmost reel will reward you with a winning combination. For the highest-value symbols, 2 or more are needed. Finally, only the highest paying combination on each payline is awarded.
Regarding bet options, you can play Book of 99 from 10p to £100 a spin. You may find the maximum bet limited at some casino websites (£5 or £10 per spin) On a laptop or PC, use the plus and/or minus buttons to change your bet. On a tablet or smartphone, use the ‘Coins’ icon to adjust accordingly. Non-UK players have an Autoplay function (infinite auto spins with optional loss, win and single-win limits) as well as Turbo Mode (for faster spins).
The Book of 99 RTP rate is 99%. Well above the online slot game average of 96%, Relax Gaming has rewritten history with a first-of-its-kind RTP rate for a ‘Book of’ slot game. Furthermore, there are no other RTP versions as it would defeat the purpose of the game’s title.
Very high volatility, it’s classed as 5/5 on the variance front. Winning combinations will land every 3.35 spins on average as the hit frequency rate is 29.83%.
Lastly, the Book of 99 slot comes with 5,000 times bet max wins. This can be achieved on base game as well as free spins with a screen full of the highest-value symbol doing the trick. In the Free Spins feature though, where big wins are much more likely, the average win is 68.8 times your total bet.
| Slot Review Game Data | |
|---|---|
| Studio | Relax Gaming |
| Theme | Ancient Greece |
| RTP % | 99% |
| Volatility | Very High |
| Reels | 5 |
| Paylines | 10 |
| Stake Range | 10p to £100 |
| Max Win | 5,000 x Bet |
| Hit Frequency Rate | 29.83% |
| Bonus Features | 2 |
| Release Date | 4th of May 2021 |
Chris Taylor
The king of slots
Chris Taylor is an industry veteran originally from Gibraltar. Having worked in the online gambling industry since 2004, Chris loves slots and has reviewed over 10,000 online slot games. Running a slots-focused website for 13 years, Chris is the go-to guy for everything slots-related.
👨🏫 Specialist Subjects🔬📚
Chris’ online gambling career has spanned more than 2 decades. This includes working for online casino sites, consulting for software/slot providers and running his own slots portal.
With a passion for slots, Chris reviews games from an honest and blunt point of view to give readers an accurate portrayal of the slots they might play. The slot games are just the start as Chris deep dives into the slot sites to provide factual and insightful information as to where to play the games he so loves.
Book of 99 Expert Review
Theme & Symbols
Bonus Features
Max Win (5,000x)
Sounds & Music
RTP (99%)
Originality
Theme, Audio + Symbols
Released on the 4th of May 2021, the Book of 99 slot has an ancient Greek-themed game. In this Greek odyssey, you battle amongst the gods in this unique ‘Book of’ title.
With a cartoon-style design, you encounter mythological warriors. Set at night time, you’ll hear a harrowing soundtrack which sets the scene for the battle ahead. Marble columns encase the reels.
On the reels, you’ll encounter A, K, Q, J and 10 royals which all sport previous metals and gemstones. The higher-value symbols include the female daemon Lamia, the one-eyed monster Cyclopes, the high priestess Pythia and the God of the Sun and Light Apollo.
Apollo is the best-paying symbol awarding 500 times your total bet for 5 across a payline. A screen full of Apollo symbols will result in a 5,000-times bet reward.
Finally, there is the Book Wild/Scatter symbol. Substituting for all symbols above, it’s the key to triggering the Free Spins feature. Below is a list of symbol payouts and functions:
- Q/J/10: 3, 4 or 5 = 0.5, 2.5 or 10 x bet
- A/K:3, 4 or 5 = 0.5, 4 or 15 x bet
- Cyclopes/Lamia:2,3, 4 or 5 = 0.5, 3, 10 or 75 x bet
- Pythia: 2, 3, 4 or 5 = 0.5, 4, 40 or 200 x bet
- Apollo:2, 3, 4 or 5 = 1, 10, 100 or 500 x bet
- Book Wild/Scatter: Substitutes for all symbols + triggers Free Spins feature
Book of 99 Mobile
Created with HTML5 technology, Book of 99 will detect whatever device you’re using and serve you the appropriate version. Compatible with laptop, PC, tablet and mobile devices, it can be played on iOS and Android smartphones. If playing on your mobile, there’s a Portrait Mode version which is vertical and occupies the whole screen.
Bonus Features
The Book of 99 slot game has 2 bonus features. With the focus on the Free Spins feature, you get 10 free spins with a special expanding symbol. This randomly chosen symbol pays Scatter style. Relax Gaming has added a unique Collection element which gives you another way of triggering the free spins.
Free Spins
The Free Spins feature is triggered by landing 3 or more Book Wild/Scatter symbols on the same base game spin. With 10 free spins awarded, 1 of the symbols is chosen randomly to act as the special expanding symbol for the duration of the feature.
Collection feature
Book of 99 has another way of triggering the free spins. When a Book Wild/Scatter lands in the base game, it’s collected in a meter (left of the reels on laptops/PCs and above the reels on smartphones and tablets). Once you’ve collected 99 Book Wild/Scatter symbols, you’ll enter the free spins. Once you play the feature, the meter resets to 0.
If the special expanding symbol lands, it will expand to fill the entire reel. The good news is that special expanding symbols don’t need to be connected from left to right across paylines. This means the expanded symbols pay Scatter style.
Your win potential depends on which symbol is chosen as the special expanding symbol. Getting Apollo makes it a lot easier to achieve 5,000 times bet max wins whereas the Q, J or 10 royals will lead to 100 times bet payouts if you fill the reels with them entirely. To achieve the max wins highlighted below, you would need that special expanding symbol to appear on all 5 reels during a free spin.
Look out for the Book Wild/Scatter symbol as 3 or more will reactivate the feature and reward you with 10 additional free spins, with no limits.
Expert Verdict
The Book of 99 slot may seem like another ‘Book of’ game but Relax Gaming has managed to release a first-of-its-kind 99% RTP slot. With an average of 96% for more slot games these days, the 99% RTP is extremely high and makes it one of the top RTP slots online.
In terms of the gameplay, the focus is fully on the Free Spins feature where 1 special expanding symbol is randomly chosen. Whilst the max win of 5,000 times your total bet can be won on base game spins (by filling the reels with Apollo symbols), it’s much more likely during the free spins (especially if Apollo is chosen as the special expanding symbol).
I like the fact that special expanding symbols don’t have to appear on adjacent reels to award a win (i.e. Scatter Pays). Relax Gaming has also added the Collection feature into the mix which gives you another way of triggering the free spins. That said, Relax hasn’t specified the RTP allocated to this feature.
Boasting 5,000 times bet max wins, Book of 99 can pay up to 12,075 times your total bet in the Free Spins feature as a whole. As mentioned above, the average win of 68.8 x bet in the feature is something to consider.
In summary, the Book of 99 slot is another ‘Book of’ game but with a very high RTP rate. Some casinos/slot sites will not allow this game to be part of a welcome offer or free spins promotion due to the return rate.
Other ‘Book of’ Slots
Book of 99 is another game in a long line of ‘Book of’ slots. Inspired clearly by the likes of Play ‘n GO’s Book of Dead and Novomatic’s Book of Ra Deluxe, our Slots Content Manager Jenny Mason compiled the top 10 ‘Book of’ slot games from the hundreds that are available to play online. Find out which ones made the list:
ALSO READThe Top 10 ‘Book of’ Slot Games: Max Wins, Features and StudiosEditorial Information
The Book of 99 slot review was written by Chris Taylor from our OLBG Expert team who who written over 10,000 slot game reviews in an iGaming career spanning over 2 decades. It was then verified/checked by Jenny Mason, our prime Slot reviewer who has 17+ years working in online gambling, top UK brands.
Jenny Mason
Slots content manager
Jenny Mason has more than 17 years of experience in the online gambling industry and has worked for some of the UK’s top betting brands. She started at OLBG in 2014 and her role involves creating great content and looking after the marketing activity. Jenny is knowledgeable in all areas of online sports betting and has an interest in slots and bingo.
👨🏫 Specialist Subjects🔬📚
🎰🍒🍀 Jenny has become an expert with online slots completing hundreds of our various new slot reviews and creating and writing some of the slot articles found on site. She has become a firm fan of NoLimitCity and Hacksaw gaming slot in this process and always awaits the new releases with much anticipation
FAQ
Book of 99 FAQs
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What is the Book of 99 RTP rate?
The Book of 99 RTP is 99%. This rate is extremely high versus the 96% slots average. With no other RTP version available, this game will not be allowed to complete a casino’s bonus wagering requirements.
-
What is the max win on Book of 99?
Book of 99 can award 5,000 times bet max wins per base game or free spin. Key to big wins are the special expanding symbols in the Free Spins feature. In this feature, 12,075 times your total bet can be won as a whole.
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What are the Book of 99 minimum and maximum bets?
You can play Book of 99 from as little as 10p a spin to as much as £100 per spin. In some countries and at some casino sites, the max bet may be limited to £10 or even £5 a spin.
-
Is there a Book of 99 demo?
The Book of 99 free play demo is available to play at OLBG. Available on all devices, smartphone users will able to battle amongst Greek gods in Portrait Mode.
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When was Book of 99 released?
Book of 99 was released on the 4th of May 2021 by Relax Gaming. It’s become one of the most popular ‘Book of’ slots due to its very high 99% RTP rate.
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Is Book of 99 a good slot?
The Book of 99 slot has made OLBG’s list of the top ‘Book of’ slot games alongside the likes of Book of Dead (Play ‘n GO), Book of Ra Deluxe (Novomatic) and Book of Shadows (Nolimit City).
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