Books and Bulls is a 2019 Synot Games release that takes two proven genre templates — the Egyptian book-slot format and the corrida bullfighting theme — and crosses them into something that is genuinely the studio’s own. The Egyptian-book mechanic is well-established in online slots, but applying it to a Spanish bullfighting setting rather than the default Nile-and-pharaoh backdrop gives Synot a distinctive product that performs particularly well in Czech and Slovak markets where the studio has deep roots. The 5×3 grid on 10 paylines follows the book-slot blueprint closely.

The Book symbol is both wild and scatter, as the format demands. It substitutes for every other symbol on the grid and pays independently of payline position as a scatter. Three or more Books landing anywhere triggers the Free Spins round with 10 bonus spins awarded. Bets run from $0.10 to $100. High volatility is the appropriate mathematical model for this format — the expanding symbol mechanic concentrates prize potential into rare high-value configurations rather than distributing it evenly across the session.

Before the Free Spins begin, a symbol is randomly chosen to become the expanding symbol for the entire bonus round. On every spin during the feature, that symbol expands to cover entire reels whenever it appears in any position, creating the full-reel wins that the format exists to deliver. The highest-paying regular symbols produce the most significant results when selected. This expanding mechanic is where the game’s 5,000x maximum win becomes accessible, and the Bonus Buy option allows direct entry to the Free Spins for players who want to access the feature without grinding through base-game variance.

RTP is 95.97% and volatility is high.

Books and Bulls is a well-executed book-slot variant with a theme that genuinely differentiates it from the crowded Egyptian end of the genre. The core mechanics are familiar, but Synot’s execution and market knowledge make this a strong regional title.