Book Of Sirens is an exciting online slot game that will transport you to a world of mythical creatures and legendary adventures. Here are some of the exciting features and mechanics that you can expect from this immersive slot game:

- Theme: The game is based on the mythical sirens of ancient Greek legends, featuring stunning graphics and animations that will transport you to a world of underwater adventure.

- Bet amount: You can place bets ranging from as low as 10 cents to as high as $100 per spin, depending on your individual preferences and playing style.

- Free Spins: The game features a Free Spins feature that is triggered by landing three or more Scatter symbols on the reels. You can win up to 10 free spins during this feature.

- Expanding Symbols: During the Free Spins feature, one symbol is randomly chosen to expand and cover an entire reel, increasing your chances of winning big.

- Wilds: The Book Of Sirens symbol acts as the Wild in the game, substituting for all symbols except for the Scatter. Landing three or more Wilds on the reels can also trigger the Free Spins feature.

- Scatter: The Scatter symbol in Book Of Sirens is represented by the image of a siren. Landing three or more Scatters on the reels can trigger the Free Spins feature.

- Buy Feature: In addition to the regular gameplay, Book Of Sirens also features a Buy Feature that allows you to purchase a set number of Free Spins for a fixed price. This feature is ideal for players who want to skip straight to the action.

- Two game modes: You can play Book Of Sirens in two modes - for real money or for free. The free mode is a great way to get a feel for the game before you start playing for real.

Overall, Book Of Sirens is an engaging and exciting slot game that is sure to appeal to both new and experienced players alike. With its stunning graphics, immersive theme, and exciting features, this game is definitely worth checking out at your favorite online casino.