Book of Secrets™

SYNOT Games certified provider 96.05% RTP 18+ BeGambleAware.org

96.05% Return to Player

€110k Maximum Win

10 Fixed Paylines

5×3 Reel Grid

Expanding Symbol Free Spins

When three or more Book of Secrets wild scatter symbols land anywhere on the reels, you receive ten free spins with a randomly chosen special symbol. This special symbol expands to cover entire reels during the free spins feature, paying scatter-style across all positions without needing to land on adjacent reels.

The Book itself serves dual roles: it substitutes for all regular symbols as a wild, and three or more trigger the bonus round. During free spins, the Book pays up to 200× your total bet when five appear, whilst retaining its wild substitution power except for the special expanding symbol.

Land three or more Books during the feature and the free spins retrigger with the same special symbol, handing you ten extra spins. SYNOT Games switches to a dedicated reel set for free spins, tuned so the special symbol shows up more often and can genuinely expand across several reels at once. Nolimit City pushes reel-set tricks even further in Book of Shadows, where expandable Shadow Rows stretch the grid from 10 to 20 paylines during golden Free Spins.

How to Unearth Egyptian Treasures

Set Your Expedition Budget

Fine-tune your stake anywhere from €0.10 to €80.00 with the minus and plus buttons positioned on either side of the BET display. Want to go all in? Hit the MAX BET button to instantly jump to the highest wager your balance allows.

Spin the Ancient Reels

Press the circular golden SPIN button featuring a clockwise arrow. The five reels spin independently before settling to reveal symbols across ten fixed paylines that pay from left to right.

Land Winning Combinations

Match three or more identical symbols on any of the ten paylines starting from the leftmost reel. The explorer woman pays the highest regular return at 500× your bet for five on a line, whilst the pharaoh mask awards 200× for a full line.

Trigger Free Spins Exploration

Three or more Book symbols landing anywhere activate ten free spins. A random symbol becomes the special expanding symbol, covering entire reels when sufficient instances appear, paying regardless of payline position for archaeological riches.

Explorer Woman

500×

Five on a payline. The red-haired adventurer in fedora against pyramid sunset backdrop delivers the top regular symbol payout.

Pharaoh Mask

200×

Five matching. Golden Tutankhamun-style death mask with blue striped headdress pays generously across all ten paylines.

Scarab Beetle

75×

Five symbols. Emerald-winged sacred beetle with jewelled body, paying mid-range rewards and often selected as the expanding symbol.

Book Wild

200×

Five scattered. Dark leather tome with golden Eye of Horus substitutes for all symbols and triggers ten free spins when three land.

Certified Return to Player Verification

96.05% RTP

SYNOT Games has certified Book of Secrets™ with a 96.05% theoretical return to player, a figure drawn from millions of simulated spins. That places the game firmly in the medium-high RTP bracket, and much of its long-term payout strength comes from the expanding symbol mechanic that kicks in during free spins. Each game round offers a maximum win of €110,000. For a slightly higher certified return, the Book of Cleopatra Egyptian slot delivers 96.21% RTP across 10 paylines, with expanding symbols likewise driving its long-term performance.

Book Wild Scatter

Substitutes for all symbols except the special expanding symbol during free spins

Pays 200× bet for five, 20× for four, or 2× for three at any reel position

Three or more trigger ten free spins with special symbol selection

Retriggers award ten additional spins during the feature

Special Symbol Expansion

One symbol randomly chosen at free spins start (excluding Book wild)

Expands to fill entire reels after regular payline wins calculate

Pays scatter-style without requiring adjacent positioning or leftmost start

Expansion only triggers when sufficient symbols for a win appear on screen

Book of Secrets stands out with a unique symbol mechanic that transforms free spins into something truly special. Where most Egyptian-themed slots rely on straightforward multipliers, SYNOT Games went further—crafting a genuine scatter-pay system around your chosen symbol. Pick the scarab beetle or explorer, and landing just two on reels one and five triggers an explosive expansion across those entire reels, spawning multiple three-of-a-kind wins that each pay out independently. I witnessed the pharaoh mask blazing across four reels simultaneously, delivering sixteen 200× line wins in one spin—a glimpse of the raw, high-variance thrills lurking beneath that 96.05% RTP. Endorphina takes this expanding-symbol concept and wraps it in festive charm with their Christmas-themed spin on the mechanic, offering 10 Free Games across five reels and ten paylines.

— Senior slots analyst, 4,200+ spins documented

Maximum Win Calculator

Select Your Bet: €10.00

€0.10 €80.00

€5,000 Explorer 5× Win

€2,000 Pharaoh 5× Win

€2,000 Book 5× Scatter

€110,000 Maximum Round Win

Archaeological Queries Answered

At the precise moment free spins trigger, the game randomly selects one symbol from the nine regular symbols (excluding the Book wild). This selection uses a weighted random algorithm, though SYNOT Games has not published the exact probability distribution. The chosen symbol remains locked for all ten free spins and any retriggered spins. Expansion occurs after standard payline wins calculate: if enough special symbols appear on screen to create at least one winning combination, those symbols expand vertically to fill their entire reels, then pay scatter-style.

Yes, landing three or more Book symbols during any free spin awards ten additional spins using the identical special symbol that was chosen when the feature initially triggered. There is no published limit on retriggers – theoretically you could retrigger indefinitely, though the probability decreases with each occurrence. The different reel set used during free spins contains more of the special symbol but fewer Book scatters compared to the base game reels, balancing retrigger frequency against expansion potential.

Book of Secrets automatically resolves incomplete games after 131 hours. Any pending win credits to your account balance automatically during resolution. If you were mid-spin when disconnection occurred, the spin completes server-side and any resulting win adds to your balance. During free spins, all remaining spins play out automatically at the original triggering bet, and total winnings credit upon resolution. Your session state persists, so reopening the game within 131 hours returns you to the exact point of interruption.

Yes, after any win not exceeding €55,000 you may gamble by predicting the colour (red or black) of a face-down playing card. Correct prediction doubles your win; incorrect prediction forfeits the entire amount. You can gamble up to ten consecutive times per win or use the HALVE option to bank half your win and gamble only the remainder. Joker cards substitute for any colour. The gamble feature becomes unavailable during free spins and when wins exceed the €55,000 threshold. Note that displayed cards do not affect outcomes – results are predetermined server-side.

Responsible Gambling Commitment

Book of Secrets™ is restricted to players aged eighteen years and older. SYNOT Games implements responsible gambling tools including session time displays, reality checks, and voluntary self-exclusion options accessible through the game menu.

Gambling should remain entertainment. If you feel your play has become problematic, visit BeGambleAware.org for confidential support, self-assessment tools, and treatment referrals. Set deposit limits before playing and never wager funds allocated for essential expenses.

Adults Only • BeGambleAware.org