Synot Games

Book of Secrets Extra

Slots Video Slots Action & Adventure Mythology History Egypt Book Gems Treasure Ancient

High-volatility Egyptian book slot with a selected expanding symbol

SlotRanker Score

/ 99

05099

The SlotRanker Score is calculated from the visible data below. It is not affected by affiliate deals, and it cannot be bought.

How this score is built

RTP

96%

return to player

Volatility

High volatility

variance

Max win

500×

top multiplier

Min bet

$0.20

per spin

Reels

10 lines

Player rating

3.9 ★

9 votes

DEMO Play free, no signup

Synot Games

Embed on your site

3.9 / 5

9 ratings

User ratings are shown separately from the Slot Score unless stated otherwise.

Five weighted signals shape the composite. Four context signals refine ties. See how we rate for the full methodology.

Payouts & RTP9/10

RTP 96% → 9.0/10

Volatility9/10

high → 9.0/10

Win Potential5.4/10

x500.00 (500×) → 5.4/10

Features9.5/10

16 features → 9.5/10

Game Mechanics4.2/10

f=16 r=5 p=10 → 4.2/10

Context signals (tie-breakers)

Layout6/10

5x3 → 6.0/10

Bet Flexibility2/10

0.2–1 (×5) → 2.0/10

Provider Reputation6.1/10

provider avg 6.1 → 6.1/10

Popularity2.5/10

synthetic proxy → 2.5/10

Popularity blends real player search demand (~30 markets) with a catalogue-derived proxy; games without measurable search demand use the proxy alone. Not live play telemetry.

Cite this score

SlotRanker Score: 66 — Book of Secrets Extra by Synot Games

https://slotranker.com/synot-games/book-of-secrets-extra#score

How to cite

Slot Summary

As an entry in SYNOT Games' Book of Secrets series, Book of Secrets Extra preserves the recognizable book-slot equation of a five-reel line game, an Egypt setting, and a special expanding symbol during free spins. The Extra variant pairs that familiar bonus with high volatility and an x500.00 ceiling, so the defining tension is concentrated in landing the feature and seeing which regular symbol receives the expanding role.

How It Plays

Book of Secrets Extra uses 10 fixed paylines on a 5x3 layout, with qualifying line wins evaluated from the leftmost reel toward the right.

Scatter results pay independently of line wins, while the stacked-symbol format can place repeated matching symbols across consecutive positions on a reel.

Theme & Atmosphere

The Ancient Egypt setting combines Book, History, Mythology, and Treasure themes through an archaeological search for concealed riches and the central golden book.

Gems and Action and Adventure elements support the expedition premise, framing each bonus trigger as the discovery of another chamber rather than a detached feature event.

Action & Adventure Mythology History Egypt Book Gems Treasure Ancient

Features & Win Potential

The Book acts as both Wild Symbol and Scatter Symbol, combining ordinary substitution with the trigger for the free-spins portion of the game.

Expanding Symbols and Stacked Symbols increase screen coverage in different ways, while the optional Gamble feature places a separate decision after eligible wins.

High volatility Free Spins Scatter Symbol Wild Symbol Medium/High 5 Reels Gamble Stacked Symbols Book Of...Additional Free Spins Expanding Symbols RTP range 10 Paylines 96% RTP Risk/Gamble (Double) game Stack

Bonus & Free Spins

Free Spins begin after the required Book scatters appear, and one regular symbol is chosen to serve as the special expanding symbol for that round.

The selected symbol expands only when the expansion produces a win, so its feature role depends on the surrounding reel result rather than every appearance.

Spec sheet

Book of Secrets Extra at a glance.

Identity

Slot nameBook of Secrets Extra

StudioSynot Games

Released10/6/2022

Math

SlotRanker Score66

RTP96%

VolatilityHigh volatility

Max win500×

Bet range$0.20 – $1.00

Player rating3.9 / 5 · 9 votes

Format

Reels5

Paylines10

Layout5x3

Expected average based on this slot's 96% RTP — individual sessions vary with volatility.

Bet per spin

Spins per hour400

Session length (hours)

Cost per hour$3.20

Cost per session$3.20

Estimate only, for entertainment purposes — treat gambling as entertainment, not a way to make money, and set a budget you can afford to lose.

How long could a bankroll last on Book of Secrets Extra? We simulate thousands of sessions from this game's published RTP and volatility — the long-run math, not a prediction of your next spin.

Bankroll ($)Bet per spin ($)Speed

Volatility tier: High

Running simulation…

How this works

Each simulated spin either misses or returns a win drawn from a log-normal distribution, with the hit rate and spread set by the slot's volatility tier (High). The model is calibrated so the average return equals this slot's published RTP (96.00%), with wins capped at its top multiplier (500×).

This is a simplified, parametric model of the game's math — not its real paytable. It exists to make the house edge visible over many sessions, so the numbers above are averages across thousands of runs, never a forecast of one.

This is math, not a prediction. Real sessions vary wildly, and no strategy changes a game's built-in house edge. Play for fun, set limits, and never bet more than you can afford to lose.

Where to play Book of Secrets Extra

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Compare Book of Secrets Extra with other games

	Book of Secrets Extra Score 66This game	Book of Duat Score 75	Book of Conquistador Score 72	Jenny Nevada and the Diamond Temple Score 67	Sands of Eternity 2 Score 85
Identity
Studio	Synot Games	Quickspin	Endorphina	Rival Gaming	SlotMill
Released	10/6/2022	11/9/2021	1/12/2024	2/11/2025	6/18/2024
Math
RTP	96%	94%	96.05%	95.93%	96.1%
Volatility	High volatility	High volatility	—	—	High volatility
Max win	500×	32,760×	—	5,000×	15,000×
Format
Reels	5	5	5	5	6
Layout	5x3	5x3	5x3	5x3	6x5
Paylines	10	10	10	20	117649
Min bet	0.2	0.1	0.1	0.2	0.2
Max bet	1	100	45	20	60
Features
Progressive	—	—	—	—	—
Wild symbol	✓	✓	✓	✓	✓
Free spins	✓	✓	✓	✓	✓
Scatter symbol	✓	✓	✓	✓	✓
Multiplier	—	✓	—	✓	✓
Bonus game	—	✓	—	✓	—
Respins	—	—	—	—	—

Every number is shown as a delta against Book of Secrets Extra.

Comparing against

Book of Secrets Extra

Synot Games

RTP

96%

Max win

500×

Score

+ Multiplier+ Bonus Game

Jenny Nevada and the Diamond Temple

+ Multiplier+ Bonus Game

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