Book of Power

Book of Power Slot Review

Slot Provider: Relax Gaming

RTP: 96.11% | Variance: High | Maximum Win: 15,000x

Our Score: 8.4

Play at Barz Casino

WHY YOU CAN TRUST THIS REVIEW: The information and opinions on this page are the result of an comprehensive process of information gathering and live game testing by the gambling experts who work at Find out more here.

About Book of Power

Reviewed by:

Published Date: 6th February 2023

How We Review Slot Games

We test and rate all slot games across 5 criteria, assigning a score out of 10 for each and an overall score that is an average of the 5. To build an accurate assessment of each game we gather information from the supplier and play in real play or demo mode. Find out more.

Book of Power is an Egyptian-themed online slot from Relax Gaming with 5 reels and 10 paylines. It follows in the tradition of ‘Book of’ games made famous by Book of Dead. There are two free spins rounds. In the standard round, triggered by landing 3 or more standard Book symbols, one symbol will expand to full reel height to complete wins. Then, in an enhanced Power Spins round, triggered by landing 3 or more Power Book symbols, when 2 more Book symbols land the expander is upgraded to the next level, or given an increased multiplier. The top win in Book of Power is 15,000x. Spins start at 10p.

Book of Power Game Information

  • Release Date: March 2023
  • RTP: 96.11%
  • Variance: High
  • Maximum Win: 15,000x
  • Progressive Jackpot: No
  • Reels: 5
  • Rows: 3
  • Paylines: 10
  • Minimum Stake: £0.10
  • Theme: Egypt
  • Features: Wilds, Expanding Symbols, Multipliers, Free Spins, Expanding Symbol Upgrades
  • Format: 5-Reel

Testing Notes: Here’s What Happened When We Played Book of Power

IMPORTANT: To give you an accurate assessment of the games we review our writers play 200 spins. Whilst this is a useful tool to help us review games and to give an example of what might happen when you play, keep in mind that 200 spins is only a very small sample and cannot be used to accurately predict what might happen over another 200 spins. The outcome of all slots play is always random.

Boom Or Bust? Our Session By The Numbers

I played 300 spins on Book of Power for real money at Casumo Casino to test the game and this is what happened.

  • Stake Size: £0.1
  • Start balance: £20.06
  • End balance: £8.76
  • Biggest Win: 76x
  • Free Spins: 0
  • Session Time: 20 minutes 47 seconds

In an effort to trigger free spins I extended the usual 200 spins test session to 300 spins. But still no joy! Shows what a stubbornly volatile game this one is. I counted 8 times when 2 books showed, but no third. Which can be very frustrating. The best moment was a 76x win across 2 wilds and 3 pyramids which you can see in this screenshot. Despite this, I still enjoyed playing Book of Power. Production is superb and there are plenty of exciting animations to look out for including the fairy dust that accompanies wins and the Explorer who adopts a pair of shades when he appears on a payline!

Book of Power 76x Win
A 76x Win In Book of Power testing

What We Liked

  • Upgrade expander in Power Spins
  • Expanders with multipliers
  • Good max win at 15,000x
  • Superb production
  • Keep adding free spins in bonus

What We Didn't like

  • Super high variance
  • Didn't unlock bonus in 300 spins!

Book of Power Review Scores

  • Theme and Design 9
  • RTP and Variance 8
  • Maximum Win 8
  • Symbols and Paytable 9
  • Features and Gameplay 9

What Our Reviewer Says ...

"A top quality production adding energy and potential to a classic game format with progressive upgrades and multipliers with epic results."

Overall Score: 8.4

Theme & Design

Our Score 9

Excellent Production Including Stardust Animations and 3d Book Symbols

It’s fun to see how each game studio brings their own style to the ‘Book of’ format. Just as Quickspin’s Book of Duat is most definitely a Quickspin production, so Book of Power is a Relax Gaming one. The artistic style is instantly recognisable from the studio who brought you the Temple Tumble series, with its clean and warm hue.

Book of Power by Relax Gaming
Book of Power – classic Relax Gaming production style

The backdrop is what looks like the outer wall of a temple with two huge stone statues of Pharaohs. There is a kind of dusty filter over the whole scene which makes it feel like you’ve just walked into a recently opened tomb. The reels themselves are crystal-clear however, with sharp illustrations of Egyptian-icons. There are also cool animations – the Book, for example, turns 3d when it lands and emits a kind of Disney fairy dust to give a sense of magic. And our Explorer, looking like a friend of the Temple Tumble adventurers, animates when he lands on the reels. And to complete the production there is a dramatic orchestral score that strays a little from the traditional Egyptian sounds we’re used do in these games.

So, altogether, a top-class production with a luxurious, quality feel.

RTP and Variance

Our Score 8

What is RTP?

RTP (Return to Player) refers to the amount a game will pay out in cash prizes expressed as a percentage of all the money wagered on that game. For example, a 96% RTP means a game will pay out £96 for every £100 wagered. This is an average number and will vary from one session to the next.  Read more here.

What is Variance?

Variance refers to how far a game will deviate from its RTP over time. High variance games deviate a lot and produce uneven win distributions and unexpected windfalls. Low variance games provide a more stable and even distribution of wins. Read more here.

Book of Power has one RTP setting of 96.11% so no matter where you play it will run at this level. That is around average so no complaints there. As anyone who has played Book of games elsewhere will know, these are traditionally high variance slots and Relax have felt no need to change that. The base game ticks along relentlessly as you wait for 3 or more Book symbols to land and trigger the free spins where, in this case, combinations of expanding symbols and multipliers can drive big wins.

Maximum Win

Our Score 8

What Is Maximum Win?

Maximum win refers to the maximum amount a player can win from one spin. It is expressed as a multiple of the stake. For example, where the maximum win is 100,000x, from a £1 stake, the maximum win would be £100,000.  

The top payout in Book of Power is 15,000x which catches the eye. It is higher than Play n Go’s Book of Dead (5,000x) and Ghost of Dead (10,000x) but short of games like Quickspin’s brilliant Book of Duat (32,760x) or the scary Book of Shadows (30,761x) by Nolimit City.

Explore Games With Similar RTP, Variance and Maximum Win

Like the numbers? Here are some more games you might want to try.

Slot SiteSupplierRTPVarianceTop Payout
Temple Tumble 2 Dream Drop JackpotRelax Gaming94.8%High10,045xPlay Here
Dead Rider’s TrailRelax Gaming96.2%High50,000xPlay Here
Beast ModeRelax Gaming96.32%High25,000xPlay Here
Dead Man’s TrailRelax Gaming96.29%HighHigh50,000xPlay Here
La FiestaRelax Gaming96.19%High14,778xPlay Here
Book of DuatQuickspin96.27%High32,760xPlay Here
Book of ShadowsNolimit City96.01%High30,338xPlay Here
Book of King ArthurJust For The Win96.1%High5,000xPlay Here

Symbols and Paytable

Our Score 9

There are 5 reels, 3 rows and 10 paylines in action on each spin in this game. You can only bet on 10 paylines per spin unlike Play n Go’s Book of series which allows you to drop the paylines to just 1 if you wish.

Book of Power Paytable
Paytable with 500x for 5 top paying Explorer symbols

It is a feature of ‘Book of’ games that they have good value in the paytable and Book of Power is no exception. The low value symbols are the cards, 10 through to Ace. These are valued at from 0.5x for 3 10s up to 15x for 5 Aces. Then there are the picture premium symbols. These are the Pyramid, Temple, Pharaoh and Explorer, valued at from 0.5x for 2 Pyramids up to 500x for 5 Explorers.

In this instance the Wild is represented by the Books – blue and red. These substitute for all other symbols to complete paylines but are also instrumental in unlocking the free spins round which I will explain further down. They also have pay value at 1x, 10x, 100x or 500x for 2, 3, 4 or 5 on a payline.

Features and Gameplay

Our Score 9

Chance To Upgrade The Expander Symbol and Add Multipliers Powers-Up This Slot

Book of Power takes the base elements of the ‘Book of’ format and adds some nice twists in the shape of a second bonus round and expander upgrades.

Blue Book Symbol Triggers a Standard Book of Free Spins Round

The first round is triggered by the blue Book of symbol. 3, 4 or 5 blue books landing ANYWHERE on the reels earns you 10, 15 or 20 free spins.

Landing 2 Blue Books In Book of Power
Landing 2 blue books, waiting for the 3rd

As standard, ONE symbol will randomly be chosen before the free spins starts to be the expander. When it lands, it expands to full reel height and so that further wins can be triggered in any direction.

That is your typical Book of free spins round. But there is a twist. If you land 2 further Blue Book symbols during free spins then ANOTHER symbol is randomly chosen as the expander AND 5 more spins are awarded. And if the randomly chosen symbol happens to be the one that is already the expander, then a 1x multiplier is added to it instead.

Red Power Book Symbol Triggers Power Free Spins With Upgrades

The extra round that you get here has been carefully configured to produce added thrills. So, as usual, 3, 4 or 5 Power Books get you 10, 15 or 20 free spins. And one symbol is chosen as the expander. But the difference is, if you land 2 more Book symbols then rather than adding another expander, the one you have is simply upgraded to the next pay symbol. And when the expander is the top paying symbol, then a +1x multiplier is added, up to a maximum of 9x.

You also get 5 more spins.

And to complete the story, if you land a Power Book on reels 2, 3 or 4 during Power Spins then that reel becomes Golden and expanders are GUARANTEED.



The Final Verdict

In a crowded niche, Book of Power, has enough innovation and twists to make it stand out and become a hit in its own right. As we expect from Relax, this is a carefully planned and developed game with really enjoyable graphics and gameplay.

The addition of extra expanders and multipliers in the first free spins round can potentially propel your wins upwards significantly. But it’s the Power Free Spins round where most of the epic payouts will come. Consecutive symbol upgrades and multipliers at the top end of the paytable along with re-triggers mean that you could be looking at full screens of Explorers with multipliers as well.

Fans of the Book of series will love it!

Useful Tips When Playing Book of Power

Remember, online slots are games of chance, there is NO strategy that can improve your odds of winning. However, reading our review and following these tips will help you get the most out of your time playing this slot game.

1. Start At A Low Stake

With all ‘Book of’ games I advise to start at a low stake. In 300 spins I still didn’t unlock free spins so you need to stretch your balance far to give yourself a chance.

2. Look Out For Wilds In Base Game

I still achieved a 76x win in the base game thanks to 2 wilds (Book Symbols). So it is possible to achieve good wins without unlocking the bonuses. Keep an eye out for Wilds to help you.

3. Red Power Books Are Rare

I very rarely saw a Red Power Book during testing. They are elusive. Keep your eyes peeled for them because when they land they are literally ‘powerful’!

4. Play At Our Recommended Slot Sites

We recommend the slot sites on this page because they are regulated under UK law. That means they are safe, fair and secure and all games have been audited to ensure the outcome of each spin is random.

Who Made Book of Power?

  • Name: Relax Gaming
  • Established: 2010
  • UK License: Remote 037462-R-319357-014
  • Total Games: 100 +
  • Known For: High variance, high max win, progressive jackpots, innovative game mechanics
  • Popular Slots: Money Train, Temple Tumble, Dream Drop Jackpots, Hellcatraz
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