Book of Aztec Slot Review — RTP, Free Demo & Where to Play (2018)
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Book of Aztec — AMATIC's Answer to Book of Ra
Every provider has a Book slot. Novomatic started the genre with Book of Ra, and the expanding-symbol-during-free-spins mechanic has been cloned more times than any other feature in slot history. AMATIC's contribution is Book of Aztec — a Mesoamerican-themed variant that uses the identical core mechanic with a marginally higher RTP than Novomatic's original. For players who love the Book mechanic but want to squeeze slightly better mathematical value from it, Book of Aztec is the quiet alternative that delivers.
The Book Mechanic — Explained Properly
The Book symbol acts as both wild and scatter simultaneously. As wild, it substitutes for every other symbol to complete winning combinations. As scatter, three or more Books anywhere on the reels trigger 10 free spins. Before the free spins begin, one symbol is randomly selected from the paytable to become the special expanding symbol. During each free spin, if the chosen symbol appears on a reel and could extend to create or enhance a win by covering the full reel, it expands to fill all three positions on that reel.
The critical factor is which symbol gets selected. If the explorer (highest-paying standard symbol) is chosen, expanded instances across two or three reels simultaneously produce payouts of 100-500x your stake. If a low-value card symbol like 10 or J is selected, even full reel coverage produces modest returns. This randomness in symbol selection is what creates the Book genre's characteristic high volatility — identical trigger conditions produce wildly different outcomes based on a single random selection before the feature begins.
Why Book of Aztec Over Book of Ra?
Mathematical edge. Book of Aztec carries an RTP of approximately 96.03%, compared to Book of Ra Deluxe's maximum 95.10%. That 0.93 percentage point difference accumulates meaningfully over extended play. The gameplay mechanics are functionally identical — same number of free spins, same expanding symbol system, same high volatility. The only differences are thematic (Egyptian vs Aztec) and mathematical (slightly better RTP). For pure value players, Book of Aztec is the superior choice.
Volatility Warning
High volatility. Book slots are inherently volatile because the feature's value depends entirely on the randomly selected expanding symbol. You will experience free spins rounds that return less than 5x your stake and rounds that return 500x. The base game between features is lean — expect 100-200 spins between bonus triggers with modest payline wins sustaining your balance. A bankroll of 300x+ your bet level is recommended for Book slot sessions.
The Verdict
Book of Aztec is the mathematically superior Book slot for players who prioritise RTP over brand recognition. The 96.03% return beats Book of Ra Deluxe by nearly a full percentage point. The expanding symbol mechanic is identical to the genre standard. The Aztec theme provides visual variety if you're tired of Egyptian corridors. If you play Book slots regularly, switching to Book of Aztec is a mathematically sound decision that costs you nothing in gameplay quality.