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 Casumo Casino

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 the fourth in a series of slot games developed by popular studio, Relax Gaming, in partnership with gambling community site, Casino Grounds. The idea is that with the benefit of feedback from a group of fanatical slots players during development, Relax can kick out some really top notch content. Earlier releases like Beast Mode, have shown that idea to work and Book of Power provides further evidence. Here, expander upgrades and multipliers are added to the standard Book of … format to energise this game and give it the power to become a hit in its own right.

Book of Power Game Information

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

Book of Power Review Scores

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

What Our Reviewer Says ...

"A top quality production adding energy and potential with progressive upgrades and multipliers with epic results."

Our Score: 8.4

Book of Power Pros and Cons

What We Liked

  • High value premium and wild symbols
  • Chance to upgrade expander in Power FS
  • Two expander symbols earn multpliers
  • Good potential at 15,000x
  • Re-triggers in bonus rounds

What We Didn't like

  • Another Egyptian-themed slot!

Theme & Design

Our Score 9

This is a good-looking slot. Anyone who enjoys classic Ancient Egyptian-style games like Book of Dead will like the artwork which invokes all the usual imagery we expect including pyramids, pharaohs, hieroglyphics and scarabs. But it’s all been brushed up and has that clean and warm hue that Relax slots like Temple Tumble exude. It all gives Book of Power a luxurious, quality feel. 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.

To summarise, the feeling you get is of an elegant, atmospheric game with very high production values – a cut above the competition.

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 an RTP of 96.11%. This about standard for a Relax Gaming slot. For comparison, one of their most popular titles, Money Train, runs at 96.12%. The most popular Book of slot, Book of Dead by Play n Go, has a 96.21% RTP.

Variance is, as to be expected of a Book of game, very high. Expect much frustration, but with free spins, multiplier and expanding symbol combinations, big win sequences will definitely be a possibility for those with patience.

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 win in Book of Power is maxed out at 15,000x which is significantly higher than Play n Go’s Book of Dead (5,000x).

However, Relax Gaming do have some games with much higher max wins if you are looking for greater potential. You could try Dead Rider’s Trail (50,000x), Hellcatraz (50,000x) or Ramses Revenge (49,996x) for example.

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%High50,000xPlay Here
La FiestaRelax Gaming96.19%High14,778xPlay Here

Symbols and Paytable

Our Score 9

Book of Power takes place on a 5 reel and 3 row set with just 10 active paylines. This is a standard Book of set up. Wins are scored by landing three or more identical symbols on the reels from left to right across a payline.

There are some good values in the paytable, particularly at the high premium level.

Low payers are the cards, 10 through to Ace. They have values of 0.5x for three 10s up to 15x for five Aces. Premiums are the Pyramid, Scarab, Pharaoh and Explorer character. These are valued at between 0.5x for three Pyramids up to 500x for five Explorers.

In classic Book of style, the Book symbol is VERY powerful. It doubles up as the Wild and Scatter. So it substitutes in for all other symbols to complete win lines, pays out 10x, 100x or 500x for 3, 4 or 5 on a payline AND triggers the free spins round. In this instance there is also a Power Book symbol that does all that and triggers a Power Free Spins feature as well.

Book of Power Paytable
Book of Power by Relax Gaming – Paytable

Features and Gameplay

Our Score 9

The features are all about the free spins round and expander symbols. But Relax have added some nice twists on the original Book of format to power-up your payouts.

Standard Free Spins With Multiple Expanders, Multipliers and Extra Spins

First comes the standard Free Spins round. Three or more Book symbols will get you in with 10, 15 or 20 spins for 3, 4 or 5 Books. As the round begins, the Book is displayed centre screen and opens to reveal which character will be the special for the round. When that one lands and forms part of a win, then it expands to full reel height and may create more wins.

The round is enhanced if you land TWO book symbols on one of your free spins. Then another symbol is chosen as an expander and the round is extended by FIVE spins. And if the new chosen symbol is already an expander, it simply gets an extra 1x multiplier, up to maximum of 9x. 

Power Free Spins With Symbol Upgrades and Golden Reels

The enhanced Power Free Spins round is triggered by landing three Books where at least one is a Power Book. This time you get 10, 15 or 20 Power Free Spins as well as your 10x, 100x or 500x payout.

Standard rules apply – expander is chosen, it expands when landing and being part of a win. Now, however, when two expanders land on the same spin, your expander is upgraded to the next higher in the paytable. Plus you get FIVE more spins. And if your expander is the highest paying Explorer, then it gets a 1x multiplier added, up to a maxium of 9x.

Finally, should you land a Power Book on reel 2, 3 or 4, then the reel becomes golden and expanders always land on those reels for the remaining spins.

Random Hot Mode Enhances Your Odds 

And there is one final twist – Hot Mode may trigger randomly at the start of either bonus round. If it does then the whole round is played with increased odds of scoring the big wins.


More Games Like Book of Power

Beast Mode by Relax GamingThis ‘weight lifting’ game was also developed with the Casino Grounds group and proved to be a big hit. With expanding rows up to 7 high and 4,096 paylines, Cascading Wins and Mystery Spins provide innovative gameplay.

Book of Shadows by Nolimit City For a more leftfield take on the Book of … series, try this horror version by Nolimit City. The theme and artwork, featuring a scary witch girl make this a compelling play. Standard expanders and a 10,000x top win included.


Where to Play Book of Power Slot – Further Recommendations

NY SpinsTry playing Book of Power at this SuprPlay casino which has more than 1,000 slots to try and a special 1v1 tournament feature where you can battle other players on slots to win bonuses and spins. Deposit from £20 – Paypal included. 

CasumoAlternatively, try our favourite UK slot site, Casumo, where you can enjoy over 2,900 slots and live dealer tables, including Relax Gaming slots. Hourly reel races with £1,000s prizes add jeopardy to your spins. Deposit start at just £5.

The Final Verdict

Our Score 8.4

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!

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
Find More Relax Gaming - Trusted and Independent Online Slot Reviews has been publishing online slot reviews since 2018. It’s fair to say we know a thing or two about what makes a good game – that magic mix of theme, style, gameplay and payout potential. For each slot we review we take you on the full journey through its narrative and design, reel configuration, key numbers including RTP and max win, volatility level, gameplay, and finally an expert verdict. You can also check our comparison tables to see how each slot matches up against others handpicked by our reviewers and check our tips on hitting that winning streak.

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