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Book of Poseidon slot

Book of Poseidon
Book of Poseidon
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Updated: 22.07.2025
Reviewed by: Ella Houghton

Most of the slots with the “Book of…" mechanic are more or less standard Ra clones as providers are not in a hurry to come up with new and interesting twists to the standard "Book" formula. Booming Games' Book of Poseidon is unfortunately one of those games and it's essentially a remake of their own Book of Tombs, with a few very minor changes to the math model. In this review, you will find out what this slot is about, as we will tell you in detail about everything that it consists of: the mathematical model, bonuses, the betting range and the design.

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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 Poseidon slot

General information about Book of Poseidon slot

Rating by Ella Houghton:
7.8
User’s Rating: Not rated yet
Booming Games
Write a review +25 SJ points
  • Release Date:
    20.01.2022
  • Volatility:
    High
  • RTP:
    95.7%
  • Multiplier:
    Yes
  • 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 (€/£/$):
    0.1 to 20
  • Slot Theme:
    Ocean floor
  • Technology:
    JS, HTML5
More infoLess info

Licensed and tested by

  • AGCO
  • eCogra
  • Gambling Comission
  • MGA
  • ONJN
  • Quinel

How to play

The playing field installed underwater with 5 reels in 3 rows gives you 10 lines to create prize combinations. The base game is as tedious as ever as all you can get during it are Book symbols which are Wilds/Scatters and standard combos. The whole game comes down to triggering the bonus round with the Expanding symbol.

To start diving into the depths of the ocean, you need:

  • Open Book of Poseidon at your favorite casino
  • Click on the menu button to view the paytable and rules
  • Choose a bet: from €0.10 to €20
  • Spin the reels!

Book of Poseidon RTP and Volatility

8.3 

High risk comes with 95.68% RTP.

Book of Tombs, from which Booming Games clearly drew inspiration for this game, came with a high risk of 95.42%. Here you get everything the same but the RTP increased slightly, up to 95.68%. Well, these are not the most favorable conditions for high-risk players.

Theme

7.8 

We have already said that the base game is tedious as never before, not only because of the fact that there are no bonus features in it but also because of the static underwater background, where even the bubble does not rise to the surface! All you see in the background is the static ocean floor with corals, algae, and starfish. Most of the space on the screen is occupied by the playing field in a golden frame on which all actions take place.

Four premium symbols, or majors, as they are called here, appear on the reels. These are Poseidon, an octopus, a dolphin, and a large turtle. They pay 60x-500x your stake for a combo of 5 matching on a line, and Poseidon himself is the top-tier symbol. Low-paying symbols are classically stylized playing card suits. The symbol of the Book, as it usually happens in the "Book of ..." slots, is both Wild and Scatter.

Theme

Book of Poseidon slot paytable

Mobile compatibility

Mobile compatibility

Do not want to be at home during the gameplay? Then use the mobile mode of this slot machine! Booming Games created this slot machine using JS and HTML5 technologies, which allows it to load quickly on all modern mobile devices and adapt to small screen sizes.

About Booming Games

This slot machine was created by Booming Games, one of the leading B2B providers in the gambling industry. This company has offices in Manila, Athens, the Isle of Man and London and is gaining popularity in Europe and Asia due to the excellent quality of its services. The Booming team brings a variety of games to the market, develops innovative bonus features and volatility so that every player finds something for himself. Their notable releases include Booming Seven Deluxe, Oh Catarina and Desert Drag.

Bonus Rounds & Free Spins

7.2 

When landing at least 3 Book symbols (Scatter/Wild) anywhere on the playing field, the slot will trigger a bonus round with 8 free spins. Then you'll see a standard one randomly selected, which will become a special Expanding symbol until the end of the feature. You will get a +1 special Expanding symbol for every re-trigger of the bonus round and for this you need to land 3+ more Scatters. You will receive 8 new free spins for every re-spin. Up to 9 symbols can potentially become Expanding. These symbols pay regardless of position as long as you land at least 2 matching premiums or 3 matching low-paying symbols anywhere.

Book of Poseidon slot machine

Book of Poseidon Demo play

Being able to test something before buying it is very important and luckily you can try this game for free! Book of Poseidon comes with a free demo mode. While playing in this mode, you can spin the reels, get prize combinations and bonus features by betting with "fun" coins instead of real money. Of course, when playing in the free mode, it will be impossible to withdraw the funds won, since they are not real.

Max Win

8 

Fill the grid with Poseidon symbols and win 5,000x.

During the Expanding Symbols bonus round, you could theoretically fill the entire playing field with top-tier Poseidon symbols. When this happens you will receive a maximum prize of 5,000x your stake. Meh...this is the standard potential for a "Book of..." slot and is unlikely to impress the experienced gambler.

Book of Poseidon Video Review

Get ready to dive deep beneath the surface of the sea, searching the oceans on the trail of yet undiscovered treasures. Booming Games brings to you Book of Poseidon - a 5x3, 10-line video slot featuring Unlimited Free Spins and glowing Expanding Symbols. The ancient Book of Poseidon is a Wild Scatter. Land 3 to 5 Scatters on the reels to trigger Free Spins with a symbol expanding over the entire reel throughout the whole round. Free Spins can be re-triggered, each time activating an additional Expanding Symbol for up to 9 Expanding Symbols during these rounds. The seas will turn to gold! Join the God of the Sea himself in this high volatility adventure that takes you into the depths, with potential to win more than 5000x. And to top that off, the slot comes with a Gamble feature for the bravest marine explorers who want to double or quadruple their wins!

Overall Rating

7.8

Book of Poseidon is a bad example of a "Book of..." slot. Its RTP is below the market average and its potential is boring. On top of that, it has an Expanding symbols bonus round which we have already seen countless times, and its static and boring visual presentation didn't make it any better. The base game here is a tedious job, as in many other similar games, and how the bonus round goes depends largely on 2 things. The first is which Expanding symbol you get first, and the second is how many times you manage to re-trigger the feature to get new Expanding symbols. Poseidon can give you max win per 1 spin, but this is still a very mediocre and boring release overall.

Hits
The Wild/Scatter Book symbol
Bonus Round awards up to 9 Expanding symbols
Misses
RTP below industry average
Static boring design
High volatility

FAQ

What bonus features does the Book of Poseidon have?

There is a book symbol which is Wild and Scatter at the same time as well as a Bonus Round with free spins and up to 9 Expanding symbols.

What about free mode?

Booming Games has made sure that there is a Demo mode for this slot machine so you can try it for free at any time!

What is the Return to Player (RTP) in the Book of Poseidon?

The RTP of this highly volatile slot is 95.68% which is below the industry average.

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Ella Houghton
Ella Houghton
Expert in: News, Blog, Slot reviews, Payments
Ella is a professional content-writer with 8 years of experience in the casino sphere. She has broad knowledge of gambling related themes and is happy to share this with Slotsjudge.

2126 articles

Reviewed by Editor-in-Chief
Nikita Lukanenoks

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