How Book of Secrets Works
Book of Secrets is a 5-reel, 3-row video slot from SYNOT Games that brings the allure of ancient Egypt to your screen with a sophisticated twist on the classic book-themed formula.
The centrepiece is the Book of Secrets symbol - a leather-bound tome emblazoned with the Eye of Horus. This isn't your standard Wild. It acts as both a substitute symbol and a Scatter, paying at any position. Three Books anywhere on the reels award 10 free spins plus a 2x total bet scatter win.
Here's where it gets interesting: at the start of free spins, the game randomly selects one regular symbol (excluding the Book itself) to become the Special Symbol. During the bonus round, after regular payline wins are calculated, if enough Special Symbols land to form a win, they expand to fill their entire reels. Unlike normal wins, these expanded symbols pay regardless of position - they don't need to be adjacent or start from the leftmost reel.
For example, if the Scarab Beetle is chosen as the Special Symbol and three appear scattered across reels 1, 3, and 5, all three reels fill completely with Scarabs and you're paid for three of a kind. This mechanic can produce substantial wins, especially when premium symbols like the Explorer Woman or Pharaoh Mask are selected.
96.05%
RTP
5×3
Reel Grid
10
Paylines
£0.10-£80
Bet Range
£110,000
Max Win
The base game features high-quality symbols including the red-haired Explorer Woman (top payer at 500x for five), the golden Pharaoh Mask (200x), a winged Scarab Beetle, and a jewelled Ankh Cross (both 75x). Lower values are represented by card symbols A, K, Q, J, and 10, styled with gold borders and gradient fills.
Free spins can retrigger with the same Special Symbol if you land three or more Books during the bonus. The feature uses a different reel set with adjusted symbol distribution to enhance the expanding symbol mechanic.
After any win under £55,000, you can activate the Gamble feature - a classic red/black card prediction game. Guess correctly to double your win, with the option to Halve (bank half, gamble half) for risk management. You're allowed up to 10 consecutive gambles per feature, and Joker cards count as correct guesses for either colour.
Built on HTML5, Book of Secrets runs smoothly on desktop, iOS, Android, and Windows devices at 720p HD resolution. The game includes Autoplay functionality that pauses at the start and end of free spins, giving you control when bonuses trigger.
With medium-high volatility, Book of Secrets balances frequent small wins in the base game with the potential for significant payouts when the expanding symbols align during free spins. The 96.05% RTP sits comfortably within industry standards for UK players.
