Book of Sirens is a 5×3 video slot from Spinomenal. It has 10 fixed lines, a Scatter Wild and free spins with an expanding symbol that is determined during a mini-game prior to FS. The slot’s engine resembles the one used in Book of Baba Yaga, except that the latter has 5 lines. Book of Sirens was a cold slot for me because my net loss was $14.40 after 200 spins.
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Test video with Book of Sirens slot
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Key findings after 200 spins in Book of Sirens
| Initial Balance | Final Balance | Number of Spins | Bet Size | Total Money Bet | Win/Loss | Bonus Hits | Provider's RTP | Actual RTP |
|---|---|---|---|---|---|---|---|---|
| 5000.00 | 4985.60 | 200 | 0.10 | 20.00 | -14.40 | 0 | 96.14% | 28% |
The video slot has 10 lines. You can set a bet size to the fixed values: $0.01, $0.02, $0.05. $0.1, $0.3, $0.5, $1, $2, $5 and $10 per line. So, your spin bet can vary between 10 cents and 100 dollars.
I did not trigger any bonus features while spinning the reels of Book of Sirens, but I was close to it with two scatters landed. The game seems to have medium volatility, but my session was cold, as I’ve said at the beginning, because I’ve lost about $14 against a total stake of $20.
The video slot has a Bonus Buy feature enabling you to enter free spins immediately after paying x104 total bet. You get 10 FS with a random expanding symbol.
Best winnings in Book of Sirens slot
Book of Sirens has a feature that you would not often see in other video slots. Four of its high-paying symbols award a cash prize for only two of a kind. On the other hand, 2 identical pics award half the total bet, so it’s not really profitable.
Let’s take a look at the above screenshot, showing regular (non-bonus) symbols. You will win $50,000, $20,000 and $10,000 if landing five Blonde Sirens, five Red-haired Sirens or four Blonde Sirens, respectively (at the max $100 wager). These cash credits are excellent, compared to many other Spinomenal slots.
Besides, you also have a paying scatter. Before launching FS, three, four or five scatters will add x2, x25 and x250 total bet (up to $25,000).
Free spins with Expanding symbols
What you see in Book of Sirens is the same as in another Spinomenal slot, Book of Baba Yaga, in terms of FS. So, before the feature gets underway, you are offered a mini-round with a rotating reel.
This mini-game determines a random icon that will serve as the Expanding symbol throughout all the FS. So, whenever you land that bonus symbol, it duplicates itself, covering the entire reel it has landed on. This can result in good wins. Notwithstanding the bonus symbol you will have, the Spinomenal slot awards 10 free spins.
My Verdict on Book of Sirens
The video slot does not deliver any unique features – everything you can see in Book of Sirens has already been implemented in other games of this studio. If you like low-volatility slots, Book of Sirens is for you. If you like free spins with a twist – Book of Sirens is for you. Do not expect anything particularly deep here. One of the few things I like about the game is its high potential rewards – up to $50,000.