Real screenshot from our demo test, 1 Nov 2026
Relax GamingReleased 8 Mar 2023
Book of Power Demo & review
A 10-line Egyptian book slot from Relax Gaming where retriggers add or multiply expanding symbols, and Power Free Spins move the expanding symbol up the paytable.
Written by Hampus GravePublished 3 Nov 2026
Play money · no sign-up · no deposit
- RTP
- 96.11%
- Volatility
- High
- Max win
- 15,000x
- Grid
- 5x3
Play Book of Power for real at YEET
FluxPlays verdict
Our verdict
Book of Power is worth playing for one feature: Power Free Spins. There, two Books lift the expanding symbol one step up the paytable and add five spins, and once it reaches the top, each retrigger adds a multiplier instead. Regular Free Spins are a solid book round with stacking extras. The drawback is reaching Power Free Spins on purpose: Power Bet doubles every stake, and the direct buy costs 200x.
Who it suits
Play this if…
- You are a book-slot fan: the expanding symbol works as you know it, with retriggers that add more
- Bonus buyers who want a choice of round: the regular and Power versions sit side by side on the panel and play differently
- You like a bonus that improves itself: in Power Free Spins two Books move the expanding symbol up the paytable
Skip this if…
- Short-session players: most base wins are card-rank lines worth cents
- You want the best round without paying extra: Power Free Spins need Power Bet or the buy
- You dislike paying double per spin: Power Bet is the only natural route to the Power round
Where to play Book of Power
Book of Power is available at these casinos we have tested and reviewed. How we test casinos
YEET
18+ · T&Cs apply
SafeCasino
FluxPlays score 7.5
Skrill withdrawal paid out in 18 hours in our test
400% up to €4,000 + 1,200 free spins
- 40x wagering
- min deposit €10
- 30 days
400% welcome package up to 4,000 over four deposits, each 100% up to 1,000 plus 300 free spins. 40x wagering on bonus and free spin winnings. Minimum 10 to activate, 200 for the full 300 spins. 30 day validity. Free spins run on Pragmatic Play games.
18+ · T&Cs apply · Offer checked 7 Oct 2026
Betlabel
FluxPlays score 7.0
E-wallet payout inside 24 hours in our test
200% up to €1,500 + 150 free spins
- 35x wagering
- min deposit €10
- 7 days
200% welcome package up to 1,500 plus 150 free spins over four deposits: 100% up to 300 + 30 FS, 50% up to 350 + 35 FS, 25% up to 400 + 40 FS, 25% up to 450 + 45 FS. 35x wagering, 7 day window. Minimum 10 first deposit, 15 thereafter. Crypto deposits are not bonus eligible.
18+ · T&Cs apply · Offer checked 7 Oct 2026
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Book of Power: Full Review
Book of Power takes the classic book formula and gives its free spins somewhere to go. Retriggers add more expanding symbols or multiply the one you have, and in Power Free Spins the expanding symbol climbs the paytable instead. Relax Gaming released it in March 2023. It suits book players who want more than one draw per bonus, and bonus buyers choosing between two prices.
Book of Power game information
- Provider
- Relax Gaming
- Release date
- 8 March 2023
- Grid
- 5 x 3 (reels x rows)
- How it pays
- 10 paylines
- RTP
- 96.11% (base game) (casinos may also run 96.50% (both Feature Buys) or 94.00% (alternative version) or 90.00% (German version))
- Volatility
- High
- Max win
- 15,000x the bet
- Bet range
- $0.10 to $60
- Bonus buy
- Free Spins 100x, Power Free Spins 200x, Power Bet: +100% stake per spin
How Book of Power works
Ten fixed lines run across five reels of three rows. The Book is both wild and scatter, and the explorer is the top symbol, matching the Book's own pays. Two of a high symbol already pay, which keeps small line wins coming.
| Book of Power symbol | Pays for 5 / 4 / 3 / 2 at $1 |
|---|---|
| Explorer, Book | $500 / $100 / $10 / $1 |
| Pharaoh | $200 / $40 / $4 / $0.50 |
| Scarab chest, pyramid | $75 / $10 / $3 / $0.50 |
| A, K | $15 / $4 / $0.50 / none |
| Q, J, 10 | $10 / $2.50 / $0.50 / none |
The card ranks fill most of the reels, and any of them can be the expanding symbol in free spins, so their three-of-a-kind pay matters more than it looks.
The base game before spin 1, still at the 2.00 opening bet: the 5x3 reels, the Power Bet toggle with its tooltip and the BUY button. FluxPlays demo test, 1 November 2026.
The paytable at $1 in our session: the explorer from 500 for five down to 1 for two, then the pharaoh, scarab chest, pyramid, A and K. FluxPlays demo test, 1 November 2026.
Book of Power free spins: how they trigger and what expands
Three, four or five Books anywhere give 10, 15 or 20 Free Spins, and a random symbol is picked to expand. When it lands, it covers its reels and pays on all 10 lines. In free spins the Book stays wild for everything except the expanding symbol, and a Lucky Boost can fire as any Free Spins mode starts, which the rules name without describing.
Retriggers in regular Free Spins
Two Books during the round add five more spins and a second expanding symbol. If the draw picks a symbol that is already expanding, that symbol gains +1 multiplier instead. So a long round can end with several symbols expanding at once, or one with a multiplier on it.
Power Free Spins
Power Free Spins start when a Power Book is among the triggering Books. Two Books then upgrade the expanding symbol one step up the paytable and add five spins, so a card rank can climb toward the explorer. Once the symbol is at the top, each retrigger adds +1 multiplier. A Power Book on reel 2, 3 or 4 also turns that reel golden, and the expanding symbol fills it on every spin even when it did not land there.
The upgrade is what carries the game: regular Free Spins hope for a good draw, while Power Free Spins improve a poor one.
The trigger on base spin 80 at $1: four Books, 15 Free Spins, and the A picked as the expanding symbol. FluxPlays demo test, 1 November 2026.
Power Bet and the Feature Buys: prices and what you get
Three ways change how you reach the bonus. Power Bet is a setting that doubles every base stake, and the two buys start a round at once from the main game.
| Feature | Type | Price at $1 | Official RTP and volatility | What you get | Our test |
|---|---|---|---|---|---|
| Free Spins | Bonus buy | $100 | 96.50% | 10, 15 or 20 spins, one random expanding symbol | One round: $35.00 back |
| Power Free Spins | Bonus buy | $200 | 96.50% | 10, 15 or 20 spins with the upgrading symbol | One round: $129.50 back |
| Power Bet | Bet mode, per spin | $2 a spin | Not stated | Power Free Spins possible, Free Spins chance up 170% | Not tested |
Neither buy carries a volatility level of its own in the help screens. With Power Bet on, regular Free Spins can also be gambled for Power Free Spins.
The Buy Feature panel for Power Free Spins at $1: total bet 200.00 and the Power Book rules. FluxPlays demo test, 1 November 2026.
RTP, volatility and max win
Our build listed a 96.11% RTP without a buy and 96.50% with either buy. Relax Gaming also offers a 94% version and a 90% German one, so a casino's choice matters here. Neither the help screens nor Relax Gaming's page names a volatility level, and review sites agree on high. Book of Power caps a round at 15,000x the bet: if a round's wins add up past it, the round pays exactly that.
Our Book of Power demo test
FluxPlays demo test
1 November 2026, demo running 96.11% base; 96.50% both Feature Buys RTP
Base game spins
100
at $1 per spin
Staked
$100
Paid back
$202.50
202.5% of stake, +$102.50
Winning spins
35 of 100
35% of spins paid something
Biggest win
$144 (144x)
natural Free Spins: 4 Books gave 15 spins with the A expanding; retriggers took the round to 25 spins and the A to x3. Best plain base win $14.50 (spin 37)
Free spins triggered
1
natural trigger in the session
Bonus buys tested
Free Spins (100x)
10 spins, one expanding symbol, no retrigger
$100 in
$35 back
0.35x its price
35x the $1 bet
Power Free Spins (200x)
started with the A expanding; one upgrade to a higher symbol and 15 spins in all
$200 in
$129.50 back
0.65x its price
129.5x the $1 bet
Tested on Relax Gaming's public fun-mode demo (build 1.0.15) on 1 November 2026, with FUN practice credits read here as dollars, from a 5,000 balance. The game opened at 2.00 and the bet was lowered to 1.00 before spin 1. Quick spin on, Power Bet off for all 100 base spins (Power Bet was not tested). After the base spins each Feature Buy was bought once at 1.00. Totals reconcile to the server and the screen: 5,102.50 after the base spins and 4,967.00 after the two buys.
The natural round on spin 80 showed the retrigger rule at work. It started with fifteen spins and the A expanding, and two retriggers stretched it to twenty-five, with the A ending at x3. By the paytable, an A on three reels pays $0.50 a line, $5.00 across all ten lines. At x3 that is $15.00, which is what each of the round's last two spins paid.
End of the natural Free Spins from base spin 80 at $1: YOU WON 144.00 after 25 spins with the A at x3. FluxPlays demo test, 1 November 2026.
The buys split the same way the rules do. The regular round drew one expanding symbol and never retriggered. The Power round upgraded its A once and ran five spins longer.
End of the Power Free Spins bought for 200 at $1: YOU WON 129.50 after 15 spins and one upgrade. FluxPlays demo test, 1 November 2026.
Outside the free spins, wins came on about a third of the spins and the best paid $14.50. Two rounds and one natural bonus cannot measure the RTP, so treat this as a look at how the rounds behave.
Is it worth playing?
Yes, if you like book slots and want the free spins to improve as they go. Every retrigger here changes something, a new expanding symbol, a multiplier or an upgrade, where older book games only add spins. For us Power Free Spins is the round to aim for, because an upgrade turns a poor draw into a useful one. What it asks in return is money: Power Free Spins come only through Power Bet at double stake or the dearer of the two buys.
Pick Book of Dead if you want the classic single draw with no buy and a 5,000x cap. Pick Book of Power if you want retriggers that build on each other and a higher ceiling.
In the demo, open the Buy Feature panel first and read the Power Free Spins card. It explains the golden reels in three lines, and it is the part of the game the base spins will rarely show you without Power Bet.
Frequently Asked Questions
How do you trigger free spins in Book of Power?+
Land 3, 4 or 5 Books anywhere for 10, 15 or 20 Free Spins with a randomly chosen expanding symbol. Two Books during the round add 5 spins and another expanding symbol, or a multiplier if the new one is already expanding. Our one natural round came from four Books on spin 80.
What are Power Free Spins in Book of Power?+
A stronger version of the round, triggered when a Power Book is among the Books, which needs Power Bet in the base game, or bought from the Buy Feature panel. Two Books upgrade the expanding symbol one step and add 5 spins, and a Power Book on reel 2, 3 or 4 turns that reel golden so the symbol expands there even if it did not land.
Is Power Bet worth it in Book of Power?+
It doubles the stake and does two things: it makes Power Free Spins possible in the base game and raises the chance of any Free Spins by 170%. When regular Free Spins land under Power Bet, you can gamble them for Power Free Spins. We did not test it, so the answer rests on whether you want Power Free Spins at all.
What is the max win in Book of Power, and how is it reached?+
15,000x the bet: if the sum of a round's wins passes it, the round pays 15,000x. Expanding symbols pay on all 10 lines, so the route is a high symbol expanded across the reels with a multiplier on it, which Power Free Spins build by upgrading the symbol and adding a multiplier on each retrigger at the top.
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