Book Of Sirens by Spinomenal features Buy Feature, Expanding Symbols, Bonus Wheel, Wilds, the Book of ... mechanic, Free Spins, Additional Free Spins, Scatter symbols, and Spin The Wheel. Buy Feature triggers bonuses on demand; Bonus Wheel creates extra spin opportunities; Scatter and Wilds support Free Spins. The layout is 5-3 with 10 paylines. RTP is 96% with medium volatility. The top win is x20, and bets run from USD 0.1 to USD 100.
Additionally, Free Spins add rounds without raising the stake. Expanding Symbols increase coverage on reels. That said, the book mechanic designates a special expanding symbol during Free Spins. In practice, Wheel interactions can alter path to feature triggers.
Thematic elements emphasize dark blue water imagery, monsters, pearls, and mythic book legends alongside a water-world aesthetic. In practice, the feature set relies on wheel-based triggers and expanding symbols to sustain engagement. Visuals lean on deep blue tones and maritime motifs to support the atmosphere. Taken together, the game presents a compact, feature-driven slot with a mythic undersea motif.
