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Book of Secrets Extra Slot

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Book of Secrets Extra is an online slot game made by SYNOT. Set in a mysterious Egyptian pyramid, it has five reels offering 10 paylines, an RTP rate of 96.1% and a med...ium-high volatility. Game bonuses include wilds and a free spins round with special expanding symbols.

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  • Retriggering free spins bonus with expanding symbols
  • Great graphics and gameplay
  • Gamble feature to double your wins


Taking us into the depths of an ancient Egyptian pyramid, Book of Secrets Extra follows an archaeologist as she searches for a magical Golden Book.

We can expect to see scarab beetles, Pharaoh masks, and ankhs as we navigate through the five-reel by three-row game grid, which offers 10 paylines.

This game is a follow-up to the many other Book of Secrets slots from SYNOT, including Book of Secrets Dice and Book of Secrets 6.

It retains much of the same look and layout and most of the same bonus features as the other games, including free spins with a special expanding symbol, but reduces the top prize available.

This game was released in November 2022 so you can read our hot off-the-press Book of Secrets Extra slot review to find out more.

Theme, Graphics & Soundtrack

In terms of looks, the Book of Secrets Extra online slot delivers exactly what you’d expect from an Ancient Egyptian slot at online casinos. 

The background is a deep, red Egyptian temple which is guarded by two Pharaoh’s guards.

The soundtrack also fits in very well with the game’s theme. It may not be original, but the graphics here are great and it’s easy to see why players have been calling out for more Book of Secrets since the first slot debuted.

Book of Secrets Extra Slot

Book of Secrets Extra RTP and Variance

With a medium-high volatility, Book of Secrets Extra offers players the potential for medium-sized wins. It has an RTP rate of 96.1%, which is plum in the average range for a free slot at online casinos.

How to Play Book of Secrets Extra

Here’s a quick guide to get you playing Book of Secrets Extra:

  1. Launch the game up on your favourite device and open the menu to read through the full game rules. You can also adjust your sound settings here too.
  2. Choose your opening bet per spin by pressing the + and - buttons either side of the bet display. You can also press the Max bet button to stake the largest amount automatically or press the coin symbol to open the betting menu.
  3. Press the golden triangle button to get the reels turning. Wins are scored by matching three symbols on a payline so the only thing to do now is sit back and see if you win.
  4. Play Book of Secrets Extra responsibly by setting a win and loss limit for your gaming session.

Min & Max Bets + Top Wins

Bets in Book of Secrets Extra can start as low as 0.10 and go up to 1 at online casinos like Slots Temple. As free slot staking ranges go, it’s not the largest assortment out there. 

There are ten symbols in the game offering a mixture of payouts. The lowest prizes come from playing card symbols, which give you between 0.15x and 15x the stake.

The higher paying symbols are represented by ancient Egyptian artefacts including green scarab beetles and golden Pharaoh masks, and these will give you prizes between 0.5x and 200x. The highest wins in the whole game come from the archaeologist, who pays out between 1x and 500x the bet.

The top win in the game is 500x, which is on the smaller side for free slot top jackpots, compared to something like the potential 20,000x top win in the Jammin Jars slot from Push Gaming.

Max-win 6,525x
Volatility High
Top RTP 96.07%

Book of Secrets Extra Free Spins and Bonus Features

Book of Secrets Extra has a decent selection of bonus features.

As well as free spins, and a comprehensive gamble feature, the Golden Book of the title acts as both the game’s scatter and wild symbol. It can substitute for other base game tiles and has its own payout attached, between 2x and 200x the bet.

Free Spins

The free spins bonus is triggered by landing three of the Golden Book scatter symbols, giving you ten free goes. Before the round starts, a random symbol will be chosen to act as an expanding tile during the round. If this special symbol appears on the grid, then it will expand to fill the whole reel it’s on, giving you lots more winning lines. This symbol can also retrigger the free spins round.

Book of Secrets Extra Review

With plenty of exciting bonus features, and a super set of graphics, Book of Secrets Extra is sure to be another hit with players. But, if you fancy making your own slot review of this game, you can play this game for real money at online casinos as well as right here at Slots Temple. 

Disclaimer: Book of Secrets Extra trademark / license is owned by Synot Games. This site is not endorsed by Synot Games.

Slot Data
Slot Name: Book of Secrets Extra
Software: Synot Games
RTP: 96.07%
Volatility: High volatility
Paylines: 10
Reels: 5
Min Bet (all lines covered): £0.20 (GBP)
Max Bet: £1 (GBP)
Top Win: 6525
Features: Wild Symbol, Scatter Symbol, Free Spins, Gamble, High volatility, 5 Reels, Stacked Symbols, Book Of...
UK Available in UK? Yes. Synot Games have a UKGC license and are allowed to offer their games at UK licensed casinos.


What is the RTP of Book of Secrets Extra?

This game has an RTP of 96.07%.

What is the top win in this game?

The biggest win you can land is worth 1,000x.

What is the volatility of Book of Secrets Extra?

Book of Secrets Extra has a medium-high volatility. Online slot games like this offer players a great mixture between the smaller, more regular wins of a medium volatility game, and the larger, less frequent wins of a high variance slot so they’re perfect for most players, from newbies to the reels to more experience gamers.

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