Book of Titans presents a 6x3 grid where players aim to align matching symbols across 10 fixed paylines. The base game focuses on landing combinations of mythological figures and standard card icons to secure payouts. Wild symbols substitute for other icons to assist in forming winning lines throughout the session.

The bonus round is activated when enough scatter symbols land on the reels, awarding free spins with special expanding symbols. These symbols grow to cover entire reels, increasing the potential for wins across the board. The game mechanics are straightforward, making it accessible for players who prefer traditional slot structures with added bonus features.