Book of Secrets Extra Slot

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Book of Secrets Extra by Synot Games is an online slot where you search for lost treasures on a five reels grid.

*Any values mentioned are subject to change.

Book of Secrets Extra Game Overview

The Book of Secrets Extra is an exciting addition to Synot’s Book of Secrets slots series. If you enjoyed playing any previous Book of Secrets slot release, you would likely enjoy this one too. It follows the design of its predecessors, as well as the pattern of gameplay. 

The only difference is that this offers a maximum potential win of up to 6,525x your wager. In addition, it has medium volatility, and you can place your stake for as low as 10p up to £20 on the new casino site, King Casino. 

How To Play

The first thing to do when you open the game, is to select your preferred stake. You can do this via the + and – buttons in the ‘Bet in GBP’ panel. After setting your stake, you can press the Spin button to start digging at potential prizes! 

Lest we forget, the three bar Menu button at the left end of the screen holds the paytable and other necessary information. So, you can check it out before or during any gameplay.

The game has 10 fixed paylines, and you must land three to five matching symbols across a payline to win. However, the higher paying symbols can award payouts for only two matching symbols. Wins start from the leftmost reel of the playing grid. However, scatter wilds can award payouts from anywhere on the screen. 

Note that you only get the highest win on a payline in the case of multiple wins. Also, the value of payouts depends on the winning combinations formed, as specified by the paytable.


This slot contains reels that feature different treasures, A-10 card ranks, and the Egyptian Lady Guide.

The card ranks can pay the least. Plus, you can only win if you land up to three on the reels. For example, J, Q and 10 can earn you between 0.5x and 10x your bet for a three or five match. Meanwhile, you will get up to 15x your stake if you land five-of-a-kind A or K symbols. 

The rest of the symbols are Premiums, and you can get a payout for a two-of-a-kind combination. As a result, matching cross or beetle-shaped treasures will earn you 0.5x up to 75x your wager for a two or five-of-a-kind match. However, landing five matching pharaoh heads will reward you up to 200x your stake. 

As for the Egyptian Lady Guide, you can get up to 500x your bet if you land five across a payline. 

Scatter Wilds

Golden Books represent the scattered wilds. And they are so-called because you can earn a payout from them whether or not they align on consecutive reels. However, you must land three or more in a single spin. In addition, if you hit three or more scattered wild symbols in a spin, it’ll trigger the free spins feature, and you will also be awarded 2x your wager.

Free Spins Bonus Round 

If you trigger the free spins feature, it’ll reward you with 10 free spins. You also get a randomly selected symbol from the regular symbols. The chosen one becomes your new special symbol and may retrigger the free spins if you land them during free spins.

Even better, they can expand after a regular payout to earn you an extra win independent of their position. However, the expansion can only happen if the symbols in view are enough for a winning combination. 

Gamble Feature 

This feature activates after each win. It is an opportunity for you to try to double your wins. However, you risk forfeiting the entire payout if you lose the gamble.

Here’s how it works – you get up to ten chances per gamble feature, and you must guess the colour of hidden cards at each stage. If your guess is correct, your win doubles and you proceed to the next. 

Note that the colour could be red or black, but Jokers can substitute for any colour. Also, there’s always an option for you to gamble with just half of your wins. 

The feature continues until you lose, exhaust your chances, or reach your gambling limit.

Return To Player

Return to Player (RTP): 95.18%

RTP is used to explain the potential money that an online slot or casino game can pay back to players. It appears as a percentage and is generally calculated from gameplay over a long duration of time.

For example, if a slot has a RTP of 97% this means that it could pay back £97 for every £100 wagered.

However, there is no guarantee that players will receive this amount as slots are random in nature.

For more adventures in ancient Egypt, check out the Egyptian Sun slot.

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*All values (Bet Levels, Maximum Wins etc.) mentioned in relation to this slot game are subject to change at any time.