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Book of Skulls Slot by Spinomenal

Book of Skulls
Book of Skulls
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Updated: 22.07.2025
Reviewed by: Fabio Duarte
Book of Skulls is another beautiful pirate-themed slot by Spinomenal. Graphics, design, and bonus features - everything is at a high level here!

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In this review
  1. Slot details
  2. Theme
  3. Bonus Rounds & Free Spins
  4. Summary
  5. Where to play
General information about Book of Skulls slot

General information about Book of Skulls slot

Rating by Fabio Duarte:
8.5
User’s Rating: Not rated yet
Spinomenal
Write a review +25 SJ points
  • Release Date:
    26.08.2021
  • Volatility:
    Medium
  • RTP:
    96.1%
  • Multiplier:
    No
  • Max. win:
    5,000x
  • Bonus game:
    No
  • Free spins:
    Yes
  • Scatter Symbol:
    Yes
  • Wild symbol:
    Yes
  • Symbol Stacked:
    No
  • Jackpot Game:
    No
  • Slot lines:
    10
  • Slot reels:
    5
  • Layout:
    5-3
  • Stakes range (€/£/$):
    0.10 to 100
  • Slot Theme:
    Pirates
  • Technology:
    JS, HTML5
More infoLess info

Licensed and tested by

  • Gambling Comission
  • MGA
  • ONJN

Slot details & Wager limit

The playing field consists of 5 reels, 3 rows, and 10 paylines. You can place bets from €0.10 to €100 per spin. The base game just keeps you afloat until you activate the Free Spins Bonus Round, where all the fun begins. This feature is triggered when you land a certain amount of Scatter in the form of a book.

Book of Skulls RTP and Volatility

8.2 
The RTP of this medium volatile slot is 96.14%.
Ready to board a pirate ship to go to Treasure Island? Don't worry, you won't get caught in a big storm along the way, as this slot has medium volatility and its RTP is 96.14%.

Book of Skulls Theme

7.8 
You make winning combinations of pirate, books, and playing card suits symbols and hear a very invigorating soundtrack in the background that emphasizes the dynamism of the gameplay. The reels spin very quickly here, so you hardly need to use Autospin. The graphics are top-notch and the overall gloomy design reminds us of the Pirates of the Caribbean movie.
Book of Skulls Theme
  • Blackbeard Pirate
    Blackbeard Pirate
    pays 10x, 100x, 1,000x or 5,000x for 2, 3, 4 or 5 on a payline
  • Female Pirate
    Female Pirate
    Pays 2,000x, 400x, 40x, or 5x for 5, 4, 3, or 2 on a payline
  • Mate
    Mate
    Pays 750x, 100x, 30x or 5x for 5, 4, 3, or 2 on a payline
  • Woman with Weapon
    Woman with Weapon
    Collect 5, 4, 3, or 2 on a payline to win 750x, 100x, 30x or 5x
  • Ace
    Ace
    If you're lucky to land 3, 4, or 5 symbols, you'll get 5x, 40x or 150x your stake
  • King
    King
    If you're lucky to land 3, 4, or 5 symbols, you'll get 5x, 40x or 150x your stake
  • Queen
    Queen
    If you're lucky to land 3, 4, or 5 symbols, you'll get 5x, 25x or 100x your stake
  • Jack
    Jack
    If you're lucky to land 3, 4, or 5 symbols, you'll get 5x, 25x or 100x your stake
  • Ten
    Ten
    If you're lucky to land 3, 4, or 5 symbols, you'll get 5x, 25x or 100x your stake
  • Wild - Scatter
    Wild - Scatter
    the wild symbol is also a scatter. 3 or more scattered wilds anywhere on the slot will pay -2x, 4-25x and 5-250x and will trigger 10 free spins

Mobile compatibility

Mobile compatibility
This pirate-themed was created using HTML 5 technology, so it is mobile-friendly! You can play on any modern mobile phone and the only requirement is a good internet connection. It also uses an advanced game engine, which delivers 10x faster loading times, and an improved user interface for a truly incredible gaming experience!

Bonus Rounds & Free Spins

8.1 

Free Spins

The Wild symbol (Book) is also a Scatter that triggers the free spins feature. 3 or more scattered Wilds anywhere on the grid pay: 3-2x, 4-25x, and 5-250x the stake and trigger 10 free spins. The feature is played on the same reels and at the same stake as the base game.

As soon as the feature starts, a wheel will appear in front of you on which all the symbols (except for the Scatter and the Wild) will be depicted. Spin it to see which symbol will be Expanding during the Free Spins Bonus Round. This feature can be restarted. If this happens, you will receive 10 free spins again.

Book of Skulls - Slot

Book of Skulls Max Win

8.3 
The maximum win is 5,000x.
The maximum win here is 5,000x the stake and we would say that this is not enough if the slot did not have medium volatility. It can be won quite easily if you land the 5 Blackbeard Pirate symbols in 1 spin. Good luck!

Overall Rating

8.5
This release is very similar to Age of Pirates 15 Lines, but there you get 4 free spins options, each with 10 free spins and different add-ons. Here you can get just 1 option with 10 free spins and Expanding symbols. This game is not very exciting when compared to other, more successful ones, but it is quite playable. The design is great here and the mathematical model is fine - all you need to win 5,000x the stake.
Hits
Bonus Round with 10 free spins can be retriggered
Random Expanding symbol in free spins
Gentle mathematical model
Misses
Few bonus features
The base game is almost empty
The potential is not impressive

FAQ

Can I win real money in Book of Skulls?

Yes, after registering at the casino, you will be able to make a deposit, play for real money and receive real winnings in any of the slots.

What is the Most Valuable Symbol in this Slot Machine?

Keep an eye out for the Blackbeard Pirate symbol as it is the highest-paying symbol that can bring you up to 5,000x the stake!

What is the Return to Player (RTP) rate of Book of Skulls?

This slot has a 96.14% RTP.

Does the Book of Skulls slot have a jackpot?

There is no jackpot in this slot, but here you can win 5,000x the stake in just 1 spin!

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Fabio Duarte
Fabio Duarte
Expert in: News, Blog, Slot reviews, Payments
Fabio is a young writer with +6 years of experience in gambling & betting. Fabio creates professional reviews of casino and slots. Every single article Fabio made exhibits deep analytical skill and comprehensive coverage of a topic. It’s Fabio – one of the leading authors on slotsjudge.com.

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