Book of Power (Relax Gaming) – Review & Demo Play

Book of Power Slot Overview

Relax Gaming’s Book of Power pairs classic ‘Book’ mechanics with a couple of sharp twists. It plays on 5x3 reels with 10 fixed paylines, stakes from 10p to £30, and high volatility. The base RTP sits at 96.11%, rising to 96.5% on bonus buys where available. Two Books appear: a regular blue Book and the red Power Book. Power Bet doubles the stake and lifts bonus odds by 170%, while also letting me gamble standard free spins for the top-tier Power Free Spins.

Book of Power Slot Information

The action is Ancient Egypt, but the paytable is what matters. Low pays are 10, J, Q, K, and A; five of a kind returns 10x to 15x the bet. Premiums are a pyramid, a green scarab, Tutankhamun, and the explorer. Premiums pay from two of a kind, topping the line-up for five with 75x to 500x. Wins form left to right on 10 lines, and the Book symbols can help connect lines before the expansion rules apply in bonuses.

I like that the grid keeps things readable: 5 reels, 3 rows, and clear line mapping. The explorer is the symbol you want when expansions kick in, as full-reel spreads count from any position. The stated potential is 15,000x your stake, which suits the volatile model. The Books act as wilds and scatters, but the expanding symbol itself is exempt from wild substitution. That small clause matters once multipliers get attached during retriggers, especially if you’re already on a premium.

Book of Power Symbols and Paytable

Symbol	Quantity	Payout
	Scatter
	5	x500
	4	x100
	3	x10
	2	x1
	Scatter
	5	x500
	4	x100
	3	x10
	2	x1
	5	x500
	4	x100
	3	x10
	2	x1
	5	x200
	4	x40
	3	x4
	2	x0.5
	5	x75
	4	x10
	3	x3
	2	x0.5
	5	x75
	4	x10
	3	x3
	2	x0.5
	5	x15
	4	x4
	3	x0.5
	5	x15
	4	x4
	3	x0.5
	5	x10
	4	x2.5
	3	x0.5
	5	x10
	4	x2.5
	3	x0.5
	5	x10
	4	x2.5
	3	x0.5
	Wild

Wild Book Symbol in Book of Power

Both Books in Book of Power pull double duty. The blue Book and the red Power Book substitute for pay symbols as wilds, and they are also the scatters that trigger free spins. In the base game they can close small gaps or set up lines, but the real value arrives when three or more land to launch a feature. The wild function does not replace expanded symbols, which keeps the expansion mechanic honest during the bonus rounds.

Bonus Buy Feature

10-20 free spins The Standard Free Spins round can be instantly triggered from the base game by buying it for 100x current bet.
Feature Cost:	x100 Bet
RTP:	-
Volatility:	-
10-20 power free spins The Power Free Spins round can be instantly triggered from the base game by buying it for 200x current bet.
Feature Cost:	x200 Bet
RTP:	-
Volatility:	-

Free Spins in Book of Power

Three, four, or five Book symbols award 10, 15, or 20 free spins, plus an upfront payout of 10x, 100x, or 500x your bet. Before the round starts, a pay symbol is randomly selected as the special expanding symbol. When enough instances land to form a win, that symbol expands to cover its reels and pays all ways from any position. Standard line wins are paid first, then the expansion resolves and totals are added on top.

During the feature, landing exactly two Books adds five extra spins and assigns another expanding symbol. If the new pick is already active, it gains +1 to its multiplier instead, up to x9. This is where the round can shift gears, as double expanders stack up across separate reels. In my sessions, even mid-tier symbols felt decent with two expanders in play, while an upgraded premium can flip a routine bonus into a proper result if retriggers keep arriving.

Power Free Spins in Book of Power

Power Free Spins trigger when at least one of the activating Books is a Power Book. You still get 10, 15, or 20 spins with the same 10x, 100x, or 500x scatter prize. A special symbol is picked as usual, and expansions work the same way. The difference is progression: hitting two Books during the round upgrades the current expanding symbol one step on the paytable and adds five spins. This focuses the round on climbing towards the explorer.

Reach the explorer as the expander and further retriggers add +1 to the multiplier for that symbol, up to x9. That’s when the maths can open up, because expanded premiums pay from any position and the multiplier applies to the expanded wins. The tempo also feels better here, as the upgrade path gives clear targets. I’ve had streaks where the meter edged up a couple of times before stalling, yet even a mid-symbol with a small multiplier can pay.

There’s an extra wrinkle: land a Power Book on reels 2, 3, or 4 and that reel turns golden. A golden reel counts as if the expanding symbol is present, even when it didn’t land there. It makes backfills across the middle far more frequent, and it can rescue borderline spins. Hot Mode can also trigger at the start of a spin in either tier, nudging the odds of connecting something meaningful without changing the underlying payouts.

Power Bet, Hot Mode, and Bonus Buy in Book of Power

Power Bet is optional, but I use it when I want more feature volume. It doubles the stake and raises the chance to trigger any free spins by 170%. When regular free spins hit with Power Bet active, I can gamble them for a shot at Power Free Spins, which adds a layer of decision-making. The long-term RTP is unchanged by Power Bet; it’s a cost-versus-frequency lever, and worth toggling based on bankroll and session goals.

Hot Mode can appear in either free spins tier at the start of a spin. It’s a random nudge that tilts the odds towards a larger hit on that specific spin without altering symbol values, lines, or expansion rules. I’ve had it convert a dead spin into a four-reel spread a few times, and I’ve also seen it whiff. Treat it as variance smoothing during features, not a promise, and keep the stake sizing sensible.

Where available, Bonus Buy offers two options: 100x the bet for regular free spins, or 200x for Power Free Spins. On buys, the stated RTP moves to 96.5%. Regional rules apply, so some markets will not offer these purchases. The price points are fair for the model, but they’re still high-variance entries. I only buy when the session plan suits it, otherwise I lean on Power Bet for a steadier feed of bonuses.

Book of Power Slot Conclusion

This one nails the ‘Book’ feel while giving me proper targets to aim for. The standard round carries enough punch with extra expanders and the x9 cap, but the Power version is where I’ve seen the real swings, especially with golden reels in play. The 10-line layout keeps hits clean, the spin pace is brisk, and the 15,000x ceiling is there for grinders who ride the variance. I’ve kept it in rotation for that reason.