Book of Secrets Extra

Book of Secrets Extra

Synot’s Book of Secrets Extra online slot is based around giving players plenty of tomb-exploring action with an Egyptian theme. Combination wild-scatters are the centerpiece of the gameplay as you shoot for plenty of payouts in the free spins and in the regular game.

Rating: 85% | Made By SYNOT Games | Reviewed On

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An Introduction to the Book of Secrets Extra Slot

Anyone who has played slots for long can tell you there’s no shortage of Egyptian-themed games. A good example of this is Egyptian Ways, but the Book of Secrets Extra video slot is another entry into the sub-genre. These types of games have certain common characteristics, both in aesthetics and gameplay. For Synot, they seem to have looked to enter this sub-genre with a very strong showcase of these common characteristics.

Book of Secrets Extra Main Screen
Book of Secrets Extra Main Screen

At the same time, they put a bit of their own spin on things. This leaves them with one foot “inside of the box” with the other firmly outside of it.

When we opened this game for the first time, what stood out to us was the presentation of the reels. The symbols are large and take up a lot of the screen. You can see a bit of an underground Egyptian tomb in the background. However, it’s all about making sure that you can see what’s happening with the gorgeous symbols on the game board. Additionally, to the right, you’ll see a list of symbols that ties into a feature that we’ll get into down below.

Synot kept the gameplay mostly within what’s expected in the sub-genre. A lot of the emphasis is on the combination wild-scatter. However, they also included some other elements that make the game somewhat different than many that are out there. We like the mix of what’s familiar and what’s fresh, and we think this is the best way to introduce ideas to players without alienating fans of a particular sub-genre.

Betting and Layout

This is a slot that doesn’t require much basic knowledge to jump in and play. If you’ve enjoyed video slots before, you probably won’t have to learn anything new. We love the strong foundation they used with this game’s format that allows the features to really flourish. Here’s what you’ll want to know before you start:

  • The grid of symbols is made up of the standard dimensions: Five vertical reels with three horizontal rows set up the 15-symbol play area.
  • Synot opted for a straightforward set of 10 paylines in this game. This allows the scatters to provide more value relative to the regular line-based wins.
  • Additionally, the paylines run from left to right only, and you can’t change the number of them that are activated.
  • Something worth pointing out is the ultra-low minimum bet size of €0.10 per spin that’s available. This is lower than most games in the industry and gives players more betting options.
  • At the same time, the maximum bet size is €20 per turn. While that won’t be high enough for certain high rollers, virtually everyone else will be satisfied with the spread.

Other Information

The payout structure for this game is set up to be a little bit top-heavy. This is especially true with how the main bonus feature adds so many extra payouts. When you bring it all together, it creates an above-average volatility that is great for players who like the “go big or go home” mentality but without taking on a progressive jackpot game. Additionally, the swings will be larger than normal, but they won’t be excessively high.

Each payout in this game is a multiple of the total wager. We’re glad for that since the comparison between the scatter and wild wins become easier to compare. Otherwise, we’d be having to compare two different methods for calculating two sets of wins for the same symbol. Overall, we believe it’s the easier option for players in general as well.

Gameplay and Features for the Book of Secrets Extra Video Slot

As you may expect from the name of the Book of Secrets online slot, this game’s style centers around a combination wild/scatter. Additionally, other games like Book of Helios have a similar motif. With that said, Synot took it in a bit of a different direction with the other features in this title. That helps it to stand out from other games that have some similarities.

In what follows, we want to make it clear how the gameplay is set up. If you aren’t familiar with this style of game, it can be a little confusing at first. However, if you take a look over our breakdowns below, you’ll have no problem jumping right in.

Book of Secrets Scatter Wilds
Book of Secrets Scatter Wilds

The Golden Book of Secrets Wild Payouts

The most important symbol that you’ll find on the reels is the golden book. This book is where the name of the game comes from, and it acts as a wild symbol. You are paid for getting two or more of this wild on a payline as follows:

  • Five of a Kind – 500x
  • Four of a Kind – 100x
  • Three of a Kind – 10x
  • Two of a Kind – 1x

Keep in mind that these wins are separated and calculated on top of any scatter wins that we look at next.

When wilds show up on a payline, their substitutions are determined in a very specific way. Each individual line is evaluated by itself to see which way the wilds could be used to give the best possible prize for that specific payline. However, this does lead to situations where a single wild can perform multiple duties. It can substitute for different symbols simultaneously, for example.

Scattered Golden Book Payouts

On top of acting as a wild and giving some strong payline-based wins, the golden book also offers scatter wins. Those scatter wins are calculated and added to your balance without taking the payline wins into account. Additionally, this means the same symbols can award two different payouts at the same time: one for scatter pays and the other for a payline prize.

In any case, here’s a quick look at what the scattered book wins can offer:

  • Five of a Kind – 200x
  • Four of a Kind – 20x
  • Three of a Kind – 2x

Observant players will notice that the scatter pays are lower than the line-based ones. That’s because the scattered prizes are easier to get since the books can land anywhere to award them. No matter the reel or positioning, three or more books will give you the respective wins shown above.

Book of Secrets Free Spins
Book of Secrets Free Spins

Book of Secrets Free Spins

A set of at least three books anywhere on the game board also gives you a set of free spins. However, the number of scatters doesn’t actually affect how many free turns you get. Instead, you’re always given 10 free spins to start with regardless. This is one way that the Book of Secrets Extra video slot tries to maintain some balance with its features.

During this mode, a non-book symbol is selected at random. This is called a “special symbol” for the feature, and it is subsequently highlighted on the far left-hand side of the screen. From there, after regular wins are paid out in the feature, each special symbol expands to cover its entire reel. Additionally, they will pay out from left to right on paylines regardless of any skipped reels as long as three reels are covered in those symbols.

The end result is essentially getting paid once on each payline, or ten times, for each set of matching symbols. It’s a cool way of adding value to the game mode and giving players something value-packed to shoot for.

How to Win at Book of Secrets Extra

This is one of those games where your only real adjustment to make is to your betting if you care to. Many players will want to lower their bet sizes as a response to the volatility being a bit higher than average. The idea is that this smooths out the swings with respect to the amount you would have wagered before. However, some players don’t mind the larger swings and don’t care to adjust.

Our advice is to simply choose whichever feels best for you. If you’re the kind of play who is sensitive to a lot of volatility, dropping your bet size down a level or two is completely fine.

Book of Secrets Payouts
Book of Secrets Payouts

Payout Structure for the Book of Secrets Extra Video Slot

You can pick up a strong 500x win for five of the woman explorer in the hat in this game. She has the same wins as the golden book when it acts as a wild. Additionally, the golden pharaoh earns you 200x for five of a kind combinations. From there, a 75x win is yours when you line up five of the green scarab or red decorative ankh symbols. All four of these, much like the wilds, pay for two of a kind or more.

With the card rank symbols, however, you’ll need at least three of a kind for a payout. Additionally, they’re drawn in a gorgeous Egyptian-inspired font. Nonetheless, the red A and purple K symbols both have the same prizes available with 15x for five on a payline. The lowest payouts are 10x, which are yours for five of the blue Q, yellow J or green 10 symbols.


We imagine it’s difficult to enter a crowded sub-genre of slots and create a strong title that stands out. Regardless, Synot was definitely able to do it with their Book of Secrets Extra slot. It has some similar gameplay values as titles like Book of Aztec Bonus Buy, but the overall feel is a bit different. We also like how the focus of the graphics is on the symbols on the board and not so much of a decorative background. This made it easier to keep our focus where it belonged while testing this game out.


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What is the Return to Player (RTP) for Book of Secrets Extra?

The Book of Secrets Extra RTP is 95.18%. An RTP of 95.18% puts Book of Secrets Extra among slots with a below-average Return to Player. An Average RTP is at least 96%, and a high RTP at least 98%.