Book of Treasures (Thunderspin)

June 8, 2024

The Book of Treasures from the developer Thunderspin is somewhat different from many similar book slots. First of all, there is another winning mechanic at work here: you have 243 ways to win due to the fact that any combinations where 3 or more identical symbols are found, sequentially located on the rams in the direction from left to right, are considered winning. The slot also has a number of special functions, for example, free spins or the Book of Treasures function of the same name with the slot. The RTP of the slot is 96.16%, while the volatility is high. There are only 5 reels in the slot, the largest multiplier is x350, and the maximum win is x1500 of your bet amount. According to its design, the game takes us back to the times of ancient civilizations, the Aztec and Maya tribes. To understand if the Book of Treasures slot is suitable for you, you can read our review of it.

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The main characteristics of the slot

Release date2019
Free SpinsYes
Bonus FeaturesYes
Buying BonusesYes
Minimum bid0.2
Maximum bid20
The maximum winΡ…1500
Number of lines243
Number of reels5
GenreVideo Slot
The theme of the gameAncient Civilizations, Jungle, Book, Maya Tribes, Masks

Evaluation and our opinion about the Book of Treasures

πŸ‘ Pros

  • There is a function with free spins and a Book of Treasures function
  • It is possible to purchase a bonus
  • You can play the demo version of the slot for free
  • Different from other book slots

πŸ‘Ž Cons

  • Low payouts
  • At first it is difficult to figure out the payment system
  • Rare wins


The slot is quite interesting due to its additional features that distinguish it from other book-themed slots. However, due to the same sometimes specific functions, the slot may initially cause difficulties in understanding management and payouts. We advise you to carefully familiarize yourself with all the features of the Book of Treasures slot and first try your hand at the free demo version of the game, and only then play for money.

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Symbols Book of Treasures

There are a total of 10 symbols in the Book of Treasures slot, one of which is special. Symbols with images of various masks and a special symbol are the most highly paid. Below we have listed all the symbols of the slot in descending order of their multipliers.


  • 5 β€” Ρ…70
  • 4 β€” x30
  • 3 β€” Ρ…10


  • 5 β€” Ρ…60
  • 4 β€” x30
  • 3 β€” Ρ…10


  • 5 β€” Ρ…50
  • 4 β€” x20
  • 3 β€” Ρ…8


  • 5 β€” Ρ…40
  • 4 β€” x20
  • 3 β€” Ρ…8

Ace (A)

  • 5 β€” Ρ…30
  • 4 β€” x17
  • 3 β€” Ρ…6

King (K)

  • 5 β€” Ρ…25
  • 4 β€” x16
  • 3 β€” Ρ…6

Lady (Q)

  • 5 β€” Ρ…20
  • 4 β€” x15
  • 3 β€” Ρ…6

Jack (J)

  • 5 β€” Ρ…18
  • 4 β€” x14
  • 3 β€” Ρ…6

Ten (10)

  • 5 β€” Ρ…15
  • 4 β€” x9
  • 3 β€” Ρ…3


  • 5 β€” Ρ…350
  • 4 β€” x150
  • 3 β€” Ρ…50

Special symbols for the Book of Treasures slot

As we noted above, there is one special symbol in this slot. This is the Scatter symbol, which we will talk about in more detail later.

Scatter symbol: gives you the opportunity to get free spins and can replace other symbols

The symbol in the form of a book, as is usually the case in such slots, is both a Scatter symbol and a Wild symbol. Therefore, it has two functions at once: firstly, as a Scatter, it gives you the opportunity to get free spins, and secondly, as a Wild, it can replace other symbols of the slot, creating a winning combination.

The screenshot below shows an example of one of the many possible winning combinations with this symbol.

Special features in the Book of Treasures game  

In addition, the Book of Treasures slot has a number of additional features. These are the free spins feature, the Book of Treasures feature of the same name, and the free spins purchase feature. We will talk about each of these functions in more detail later.

The free spins feature

To activate this feature, you need 3 or more symbols with a book on the playing field. 3 of these symbols give you 10 free spins, 4 symbols give you 20 free spins, and 5 Scatter symbols give you 50 free spins at once. Moreover, if you get Scatter symbols again during the round, you get additional free spins. So with 3 symbols with the book you get 8 more free spins, with 4 symbols you get 15 free spins and with 5 Scatter symbols you get 20 additional free spins. Magic expanding symbols are also activated during the free spins round. First, one such symbol is randomly selected among the highest paid ones, and if you get additional free spins during the round, you get 2 additional magic symbols. Such symbols can fill a large part of the playing field, thereby increasing your winnings.

The screenshot below shows the process of winning additional free spins.

The Book of Treasures function

Perhaps this function is the main function of the slot. It works almost throughout the game. After each spin, a randomly selected symbol appears on the middle reel from the book, if the same symbols occur on other reels, the game automatically clones them, filling all the reels with these symbols. It also helps to increase your winnings. 

The screenshot below shows the process of the appearance of a special symbol from the treasure book.

The function of buying free spins

This feature is very useful if you don’t want to wait for the right combination to get free spins. You can just buy them. The amount of free spins will vary depending on your bet. After purchase, the feature works the same way as a regular feature with free spins, and usually helps you significantly increase your winnings.

The screenshot below shows the process of buying free spins.

Bonus games in the Book of Treasures

There are no bonus games in this slot.

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