How Book of Secrets Slot Works
Book of Secrets by SYNOT Games is a 5-reel, 3-row video slot set deep within an ancient Egyptian temple. The game uses 10 fixed paylines that pay from left to right, with all wins multiplied by your total bet amount. You'll find yourself surrounded by stone columns carved with hieroglyphs and golden deity statues as you spin the reels.
The visual design immerses you in an archaeological dig, with warm burgundy and maroon gradients suggesting torchlit temple interiors. The reel grid sits within an ornate gold frame decorated with Egyptian motifs, whilst numbered payline buttons flank both sides in distinct colours—making it easy to track which lines are active when you land a win.
Wild Symbol and Scatter Mechanics
The Book of Secrets itself serves dual duty as both the wild and scatter symbol. This ancient leather-bound tome features a prominent Eye of Horus on its cover and sits on a red surface showing hieroglyph-covered pages. As a wild, it substitutes for all symbols except the special symbol during free spins.
More importantly, landing 3, 4, or 5 Book symbols anywhere on the reels awards scatter payouts of 2x, 20x, or 200x your total bet respectively. These scatter wins are added to any payline wins, and three or more Books trigger the main bonus feature.
Free Spins with Expanding Special Symbol
The standout feature of Book of Secrets activates when you land 3 or more Book scatter symbols anywhere on the reels. You're awarded 10 free spins, and at the start of the feature, one symbol (excluding the Book itself) is randomly chosen to become the special expanding symbol.
Here's where it gets interesting: during free spins, after regular payline wins are calculated, if enough special symbols appear for a winning combination, they expand to fill the entire reel. Unlike standard payline wins, these expanded symbols pay regardless of their position—they don't need to be on adjacent reels or start from the leftmost position. This mechanic can create substantial wins, particularly if the higher-paying Explorer Woman or Pharaoh Mask is selected as the special symbol.
The free spins feature uses a different reel set with adjusted symbol distribution, and you can retrigger the bonus by landing 3 or more Books during the feature itself. Retriggered spins use the same special symbol as the initial trigger.
Symbol Payouts and Paytable
Book of Secrets features a mix of premium Egyptian-themed symbols and lower-value playing card symbols:
Premium Symbols (5 of a kind payouts):
- Explorer Woman: The red-haired adventurer in a fedora against a pyramid sunset backdrop is the highest paying symbol at 500x your bet for five of a kind
- Pharaoh Mask: The golden Tutankhamun-style death mask with blue striped headdress pays 200x
- Scarab Beetle: The emerald green winged scarab with gold detailing awards 75x
- Ankh Cross: The gold symbol of eternal life with red central gemstone also pays 75x
The lower-value symbols are stylised playing card values A, K, Q, J, and 10, each rendered in gradient colours with gold outlines. These pay between 10x and 15x for five of a kind. All symbols require a minimum of three matching symbols on a payline to award a payout, except the Explorer Woman which pays from just two symbols.
Gamble Feature for Risk-Takers
After any win up to £55,000, you can choose to gamble your winnings in a card colour prediction game. You're shown a face-down card and must guess whether it will be red or black. A correct guess doubles your win, whilst an incorrect guess loses the entire amount.
The gamble feature includes a "halve" option, allowing you to credit half your win to your balance whilst gambling only the remaining half—a smart way to secure some profit whilst still chasing bigger wins. You can gamble up to 10 times in succession, and joker cards substitute for any colour. Note that the cards shown on screen don't affect the outcome, which is predetermined. The gamble feature is not available during free spins.
RTP, Volatility and Maximum Win
Book of Secrets operates at a theoretical return to player (RTP) of 96.05%, which sits just above the industry average and is considered favourable for players over the long term. The game's volatility isn't explicitly stated by SYNOT Games, but the pay structure—with substantial wins available from the expanding symbol feature and a maximum payout of £110,000—suggests medium to high volatility.
This means you're likely to experience periods without significant wins, punctuated by larger payouts when the free spins feature hits and particularly when a premium symbol is chosen as the expanding special symbol. The betting range from £0.10 to £80 per spin accommodates both cautious players and high rollers.
Mobile Play and Technical Specifications
Built on HTML5 technology, Book of Secrets runs smoothly on iOS, Android, and Windows devices without requiring downloads. The game renders in 720p HD resolution and adjusts its interface for touch controls on mobile screens. All core features—including autoplay, bet adjustment, and the gamble feature—are fully accessible on smartphones and tablets.
The autoplay function lets you set a predetermined number of spins at your current bet level, though it automatically pauses when free spins trigger or end. For accessibility, you can use the spacebar as a shortcut for spin, stop, and navigation actions when playing on desktop.
Strategy Tips for Book of Secrets
Whilst slots are games of chance with outcomes determined by random number generators, understanding the mechanics helps you make informed decisions. The expanding symbol feature during free spins offers the highest win potential, so the game's variance largely depends on how frequently you trigger the bonus and which symbol is selected.
If you're playing with a limited bankroll, consider starting with smaller bets (the minimum £0.10 allows for 1,000 spins on a £100 budget) to give yourself more opportunities to hit the free spins feature. The gamble feature can be tempting after a decent win, but remember that each gamble is a 50/50 proposition—the "halve" option provides a sensible middle ground if you want some guaranteed profit whilst still chasing a bigger payout.
Pay attention to the paytable, particularly the difference between the Explorer Woman (500x for five) and other premium symbols. If she's selected as the expanding symbol during free spins, even landing just three across any reels can result in a substantial payout due to the expansion mechanic.