Book of Poseidon Demo: Head Underwater in Booming Games’ Entertaining Ancient Greek Slot
The Book of Poseidon slot fits squarely into the slot tradition of basing games around Ancient Greek or Roman mythology. The developer, Booming Games, has also decided to set the game beneath the sea by introducing Poseidon, the Greek god of the ocean, into proceedings. The game comes with a relatively low RTP, but it is highly volatile.
Coming with a free spins bonus and a gamble feature, the game is potentially highly lucrative. We found the game’s graphics to be a touch basic, with little additional detail in the background to help immerse you in the game’s universe. Still, the symbols on the reels are crisp and clean, though, and gameplay is smooth.
Book of Poseidon Features
As mentioned, this is a game that has been kept straightforward, with the following the key features to note.
Free spins bonus
The Book of Poseidon game is a pretty basic video slot, but it does offer a free spins bonus feature. We’ll tell you all about this later on, but it can be re-triggered an unlimited number of times.
Gamble feature
There is also a gamble feature that you can use to increase your winnings. This takes the form of a playing card guessing game. If you correctly guess the colour of a downward-facing card, you will double your win. If you correctly guess the suit, your winnings will be subject to a x4 multiplier.
Book of Poseidon Free Spins and Bonus
The Book of Poseidon free spins feature is triggered when three or more of the scatter symbols appear on the reels. The scatter symbol is the eponymous Book of Poseidon, and it also doubles up as the game’s wild symbol. The feature awards you an initial eight free spins when triggered. You can, though, retrigger the feature a potentially unlimited number of times.
During the free spins, random expanded symbols will appear on the grid to boost your winning options. The maximum number of these that can appear on the grid is nine
Book of Poseidon Theme and Symbols

As we’ve mentioned above, the slot theme of the game is centred on Poseidon, the Ancient Greek god of the sea. The 5×5 reel grid is placed squarely within his watery realm and the symbols on the reels reflect those surroundings. The highest value symbol is Poseidon himself, while other high value symbols include an octopus, a dolphin and a turtle. The lower value symbols are numbers and letters.
The game’s wild symbol is the Book of Poseidon itself, and this also doubles up as the game’s scatter symbol. As we have detailed above, it plays a crucial role in the Book of Poseidon bonus free spins feature.
Book of Poseidon RTP & Volatility
The Book of Poseidon slot has an RTP of 95.68%, which is certainly lower than we expected to discover when we started working on this review. Anything below 96% is lower than average for an online slot. Of course, RTP should always be treated with extreme caution as an indicator of a game’s performance. As the figure is calculated across millions of spins, it can only ever offer a rough guide.
You can gain slightly more clarity when you consider the RTP in tandem with the slot’s volatility, however. Book of Poseidon is a highly volatile slot, which means you are likely to spend some nail-bitingly tense periods waiting for wins to come along. When they do arrive, however, they are likely to be large. Trying a Book of Poseidon demo free play option before you risk any real money is a good way to see how it might play.
An alternative that we can recommend is Rise of Olympus 100 due to its 96.20% RTP and more clear Greek theme. The Play’n GO slot also boasts a mammoth 15,000x maximum payout, which dwarfs what is on offer here.
How to Play Book of Poseidon
Playing Book of Poseidon is very simple. The first step you need to take is to head over to one of Slotsia’s handpicked casinos and find the game. Our casino reviews will help you find a casino! Once you have found the game in the casino’s lobby, tap on it to open it. Then, follow the steps below:
- Tap the I button to reveal the game’s paytable and other important details about how it works.
- Set your bet level by tapping the coins icon.
- Click the three lines icon for settings such a language, auto adjust bet and left-handed mode.
- Tap the green circular start button to begin playing the slot.
You can also gain a good idea of how the game works by trying a Book of Poseidon demo game before you risk any real money – we have included a version at the top of this page.
Slotsia’s Review
Overall, the Book of Poseidon slot offers a good level of entertainment with a very entertaining free spins bonus feature. The gamble feature adds more thrills and is a nice way to earn extra, though we think that the graphics and sound could probably do with a bit of a refresh.
If you want to see if you agree with our verdict, fire up the Book of Poseidon demo at the top of this review, or visit one of our chosen casinos.

Nice hybrid theme

Potentially unlimited free spins

Gamble features

Below average RTP
