Book of Power Slot Review
Slot Provider: Relax Gaming
RTP: 96.11% | Variance: High | Maximum Win: 15,000x
Our Score: 8.4
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 allslotsites.com. Find out more here.
About Book of Power
Reviewed by:
Mark Wadie
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
- 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
Where To Play Book of Power
Play Book of Power at these UK slot sites which have been hand picked by our team, reviewed and rated to help you choose where to play. Each one is licensed by the UK Gambling Commission.
8.5
18+. New players only. Min. deposit £20. Max. bonus bet is £5. Bonus spins on selected games only and must be used within 72 hours. Winnings from Bonus spins credited as bonus funds and capped at £100. Bonus funds expire in 30 days, unused bonus funds will be removed. Welcome Offer is 100% match up to £200 plus 50 bonus spins on your 1st deposit, 50% match up to £50 on your 2nd deposit. Bonus funds are separate to Cash funds, and are subject to 35x wagering the total bonus & cash. Only bonus funds count towards wagering contribution. Affordability checks apply. Terms apply. BeGambleAware.org. FULL TERMS IN FOOTER BELOW
7.8
18+ new players only. Minimum deposit: £20. Maximum £100 bonus. Max bet with an active bonus: £2. Wagering requirement 100% match bonus: 30 times sum of deposit + bonus. Max redeemable from welcome bonus: £500. 100 Free Spins are given out 20 per day on Book of Dead for 5 days in a row, log in each day is required. Max Free Spins winnings: £100. Winnings from Free Spins are credited as bonus money with a wagering requirement of 45 times. Free Spins expire after 3 days. Some games may not be played with a bonus. Games may contribute differently when wagering a bonus. Play Responsibly!
8.1
New Players Only. Min. deposit £20. Max. bonus bet is £5. Bonus spins on selected games only and must be used within 72 hours. Winnings from Bonus spins credited as bonus funds and capped at £20. Bonus funds expire in 30 days, unused bonus funds will be removed. Welcome Offer is 100% match up to £300 plus 50 bonus spins on your 1st deposit. Bonus funds are separate to Cash funds, and are subject to 40x wagering the total bonus & cash. Only bonus funds count towards wagering contribution.
7.4
18+ new players only. Maximum £50 bonus. Minimum deposit: £20. Deposit Bonus wins are capped at £500. Max bet with active bonus: £2. Wagering requirement 100% match deposit bonus: 30 times sum of deposit + bonus. Winnings from Free Spins are credited as Real Money without wagering requirement. Some games may not be played with an active bonus. Games may contribute differently when wagering a bonus. Deposit Bonus expires after 30 days if wagering requirement has not been met. Free Spins expire after 3 days. One bonus allowed per person, address, device, IP. www.begambleaware.org. Full bonus terms apply
9.0
18+, New players only. Min deposit £10. 20 Bonus Spins valid on Book of Dead. Bonus funds are 100% up to £100. Bonus funds + spin winnings are separate to cash funds and subject to 35x wagering requirement. Only bonus funds count towards wagering contribution. £5 bonus max bet. Bonus funds must be used within 30 days, spins within 10 days. Affordability checks apply.
8.3
*20 Free Spins credited upon your first £10 deposit on Big Bass Splash slot only, valued at 10p per spin. Free Spins must be used within 48 hours of qualifying. All winnings are uncapped and credited to your real money balance.
8.2
18+. New Players only. One bonus offer per player. Min deposit £10. Max bonus bet £5. Bonus funds expire within 30 days & bonus spins within 10 days. Spins valid on Starburst only. 1st dep: 100% up to £300 & 100 spins, 2nd dep: 75% up to £300 & 75 spins, 3rd dep: 50% up to £300 & 50 spins, 4th dep: 25% up to £300 & 25 spins, 5th dep: 100% up to £100. The 100 spins on 1st dep are credited at a rate of 25 spins per day over 4 days. Bonus spins winnings credited as bonus funds & capped at £50. For the 1st dep offer, this winning cap shall be applied to each set of 25 spins. Bonus funds separate to Cash funds, 35x wagering.
9.0
Opt-in required. 20 Bonus Spins on “Sahara Riches Cash Collect” at 10p per spin and 100% Deposit Bonus up to £25 on first deposit (payment method and play restrictions apply). Min. deposit £10. 30x wagering for Bonus Spins and Deposit Bonus (game weighting applies). Max. £5/spin or £0.50/line. 30 days expiry. Please gamble responsibly • BeGambleAware.org
8.4
This offer is only available for first time depositors. Min deposit is £10. 50 Free Spins on Book of Dead. Spin Value: £0.10. After your first deposit you may claim your 30 Extra Free Spins by visiting the Kicker Section. No min withdrawal. This offer cannot be used in conjunction with any other offer. This offer is only available for specific players that have been selected by PlayOJO. OJO’s Rewards and Game Play policy applies. 18+| BeGambleAware| Full T&Cs Apply
8.4
18+. New players only. Min. deposit £20. Max. bonus bet is £5. Bonus spins on selected games only and must be used within 72 hours. Winnings from Bonus spins credited as bonus funds and capped at £100. Bonus funds expire in 30 days, unused bonus funds will be removed. Welcome Offer is 100% match up to £300 + 25 bonus spins on your 1st deposit. Bonus funds are separate to Cash funds, and are subject to 35x wagering the total bonus & cash. Only bonus funds count towards wagering contribution. Affordability checks apply.
8.4
Min. dep £20. Max. bonus bet £5. 200 Bonus Spins on Book Of Dead on your 1st deposit. Winnings from all spins credited as bonus funds and capped at £20. Bonus funds are separate to Cash funds & subject to wagering requirement (40x deposit plus bonus). Only bonus funds contribute towards wagering requirement. Bonus funds must be used within 30 days, spins within 72hrs. Affordability checks & Terms apply. BeGambleAware.org.
7.9
Automatically credited upon deposit. Cancellation can be requested. First Deposit Only. Max. Bonus £50. Maximum amount of Free Spins is 50. Game: Book of Dead, Spin Value: £0.10. WR of 30x Deposit + Bonus amount and 60x Free Spin winnings amount (only Slots count) within 30 days. Max bet is 10% (min £0.10) of the free spin winnings and bonus amount or £5 (lowest amount applies). Spins must be used and/or Bonus must be claimed before using deposited funds. Deposit/Welcome Bonus can only be claimed once every 72 hours across all Casinos. Bonuses do not prevent withdrawing deposit balance. Bonus Policy applies.
7.5
First Deposit Only. Min. deposit: £10. Game: Ninja Master, Spin Value: £0.2, Max Free Spins:25. WR 60x Free spin winnings amount (only Slots count) within 30 days. Max bet is 10% (min £0.10) of the Free spin winnings amount or £5 (lowest amount applies). Spins must be used and/or Bonus must be claimed before using deposited funds. First Deposit/Welcome Bonus can only be claimed once every 72 hours across all Casinos. Bonus Policy applies.
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:Â 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!
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.
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 Site | Supplier | RTP | Variance | Top Payout | |
|---|---|---|---|---|---|
| Temple Tumble 2 Dream Drop Jackpot | Relax Gaming | 94.8% | High | 10,045x | Play Here |
| Dead Rider’s Trail | Relax Gaming | 96.2% | High | 50,000x | Play Here |
| Beast Mode | Relax Gaming | 96.32% | High | 25,000x | Play Here |
| Dead Man’s Trail | Relax Gaming | 96.29% | High | 50,000x | Play Here |
| La Fiesta | Relax Gaming | 96.19% | High | 14,778x | Play Here |
| Book of Duat | Quickspin | 96.27% | HIgh | 32,760x | Play Here |
| Book of Shadows | Nolimit City | 96.01% | High | 30,338x | Play Here |
| Book of King Arthur | Just For The Win | 96.1% | High | 5,000x | Play 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.
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.
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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