Book of 99 Slot Demo
Book of 99 from Relax Gaming has a mega 99% RTP and medium volatility. In this Greek myths-themed slot, the top potential max win is 12,075x your stake, which is nicely above average for this volatility level.
Join us as we delve into this mythical title in our full Book of 99 slot review. Plus, you can try the demo version below for free to get a feel of the slot’s mighty RTP for yourself!
Our Verdict on Book of 99 – Feature Score: 7.7
Released in 2021, Book of 99 is more than a cheeky nod to the hugely popular Book of Dead from Play’n GO, with more than a few things in common. That said, this slot is a solid game in its own right, thanks to the intriguing features and massive 99% RTP.
We’re big fans of the game’s 12,075x your stake max win, as it’s a pretty high potential, given that this is a medium-volatility slot. I’d recommend it to anyone who likes the ‘Book of’ style of slots but is seeking some high RTP mixed with simple gameplay.
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Feature Score
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RTP
99%
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Volatility
Medium
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Progressive jackpot
–
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Min. BET
£0.1
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Max. BET
£100
5 Reasons to Play the Book of 99 Slot
- Huge RTP: Book of 99’s massive 99% RTP is rarely seen at UK casinos and can bring steady rewards.
- Expanding Symbols: These expand to fill entire reels in the Free Spins feature and pay-all-ways to boost your wins significantly.
- Wild Collecting: Every Wild symbol gets collected, giving you a set path towards triggering the Free Spins feature.
- Popular Slot Genre: There’s an extensive choice of ‘Book of’ slots around, proving how popular they are.
- Ideal for Wagering: With such a high RTP, Book of 99 is an ideal choice for tackling those pesky bonus requirements.
Themes
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Gods -
Mythology
Special Offer
Up to £200 Extra + 100 Free Spins
More Information
- 10 Free Spins
Book of 99 Gameplay Overview
Set Your Bet
Use the plus and minus buttons below the reels to adjust your bet amount from 0.10p up to £100 per spin.
Spin the Reels
Tap the spin button below the central reels to make your first spin.
Land Wins
Create some wins as you land matching symbols or Wilds across the slot’s 10 active paylines. Only the highest-paying combo appearing on each payline will be paid.
Key Game Symbols
Regular Symbols: Letters and numbers are the lower-paying symbols with four mythical Greek characters representing the higher-paying symbols. The max win possible is 500x your bet for landing five Apollo symbols.
Wild Symbol: The Book of 99 acts as the Wild and substitutes for all symbols except the expanding symbol in the Free Spins round.
Expanding Symbol: One of the slot’s symbols is randomly selected as the special expanding symbol at the start of the Free Spins round. During Free Spins, it will expand to cover all positions on its reel once regular wins have been paid.
These will pay out on each line, even if symbols are not connected from left to right. So, expanding symbols can prove very lucrative indeed, especially if you land them on all five reels!
Wild Collection Feature
Every Wild landing during the base game gets collected into the map-themed metre beside the reels. The Free Spins feature will trigger when you’ve filled the metre with 99 Wilds. The average of your bet sizes from each wild collection is used as your bet size during the feature.
Free Spins Feature
The Free Spins feature can be triggered by filling the Wild Collection metre or landing three or more Wilds on a single spin.
This bonus round kicks off with 10 Free Spins, and one of the slot’s nine regular symbols is randomly chosen to act as the special symbol for the round.
You’ll get an additional 10 Free Spins if you land three or more Book of 99 symbols anytime during the round.
Visuals and Theme
The theme in Book of 99 takes you on a thrilling mythological adventure inspired by Homer’s Odyssey. The symbols, all heroes and villains from Greek mythology, are illustrated in Relax Gaming’s distinct, cartoonish style. This gives the slot a unique blend of charm and creepiness. I was genuinely freaked out when a winning combo of Lamia symbols landed!
The music and sound effects add to the slot’s otherworldly vibe without feeling overpowering at any point. While the base game is solid in terms of visuals and audio, it’s the bonus round that brings the theme to life, shifting to a sunlit Arcadian setting with some smooth animations that really drew me into the game.
Book of 99 RTP and Volatility
With an epic RTP of 99.00%, Book of 99 offers one of the highest return-to-player percentages out there right now. This is way above the industry average of 96%, and it’s pretty unusual to find slots with an RTP this high. This instantly puts this ‘Book of’ slot ahead of the many others you’ll find at most UK online casinos.
Relax Gaming rates it at 6 out of 10 in terms of volatility. I’d call that a medium level of volatility, which should ensure a steady stream of moderate value wins. That certainly rings true from my testing, as I found enough rewards coming my way to play for quite a while from a modest initial bankroll.
See how the stats work out for yourself by playing Book of 99 in demo mode (for fun) at the top of this page.
Mobile Compatibility
I’m happy to report that Book of 99 is a top pick for playing on the go. Relax Gaming has built this slot to be fully responsive, and I can confirm that it ran without a glitch when testing it on my ancient iPhone 13 mini.
All the features and animations looked just as good on a much smaller screen. One nice touch is the Wild collection map moving up above the reels in portrait mode. It made it easy to play the slot with just my right hand, and it seems very well thought out for mobile casino fans.
Where to Play Book of 99
If you’re keen to play Book of 99 for real money, here are three top UK online casino suggestions to get you started. Each one has some exciting bonuses for you to claim, as well as being fully licensed to keep you safe anytime you gamble.
See the key factors behind the iGN Rating for BetMGM:
- Safety Index = Excellent – BetMGM Casino is licensed by the UKGC and provides strong encryption. Extensive documentation and tools are available for Responsible Gambling.
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Advantages: Large live game selection, with exclusive tables and Las Vegas dealers, 24/7 customer support via live chat, and fast withdrawals. The welcome bonus comes with low wagering requirements (1x).
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Disadvantages: No Phone or Email support, lack of promotions for existing players, not many payment methods available.
Minimum deposit: 10
General number of games: 3,000+
Payment speed: Instant to 3 days
Free spins: 100 Free Spins on Big Bass Splash
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Special Offer
See the key factors behind the iGN Rating for Leo Vegas Casino:
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- Advantages: Over 4,000 high-quality games, a multi-award-winning brand since 2012, 24/7 live chat support, and access to the exclusive £20M+ LeoJackpot.
- Disadvantages: Limited payment options compared to competitors, no loyalty programme for UK players, and no phone support available.
Minimum deposit: £10
General number of games: 4000
Payment speed: Instant to 5 days
Free spins: 50 Free Spins
Get 50 Free Spins on Big Bass Splash by playing £10
Final Thoughts on Book of 99
If you like the setup, there are plenty of ‘Book of ‘ inspired slots available at UK online casinos, such as Book of Ra or Book of Dead, anytime you fancy a casual spin. It can be tough to choose when they all offer pretty much the same thing, so it’s nice to see Book of 99 arriving to make your decision way easier.
With its industry-leading RTP of 99% and above-average win potential, this slot blows the competition out of the water. I’d recommend this slot to anyone looking to land some steady wins while building towards the Free Spins round with every Wild collected.