Book of 99 by Relax Gaming is a classic “Book-style” slot but with a huge twist—a 99% RTP, which makes it one of the most player-friendly games out there. That stat alone sets it apart, but there’s more to love once you dive in.
You’re spinning on a 5×3 grid with 10 paylines, chasing the all-important Book symbol, which acts as both Wild and Scatter. Land 3 of them to trigger the Free Spins feature, where one symbol is randomly chosen to become expanding—paying across all positions, even on non-adjacent reels.
What makes this one stand out further is the collection meter: every time a Book lands, it adds to a tally of 99. Fill the meter and you’ll trigger Free Spins automatically, even if you don’t land 3 books at once. It’s a clever way to reward consistency and reduce frustration in high-volatility play.
The graphics and music lean into a Greek mythology theme, with warriors, sirens, and scrolls bringing the reels to life. With a 5,000x max win, the slot balances big-win potential with that super generous RTP to create a smooth, well-paced experience.
