Book of 99 Slots

Relax Gaming takes Ancient Greece and gives it edge-of-your-seat momentum in Book of 99. The visuals mix mythic characters and cinematic sound design so every spin feels cinematic, and the paytable packs enough variety to keep every session interesting. With five reels, ten paylines and big-character symbols like the Woman, Man, Lamia and Cyclops, this one’s built for players who want straightforward gameplay with moments that can swing a session in your favor.

How the reels turn your bets into action

Book of 99 runs on a classic 5-reel layout with 10 fixed paylines and one coin per line. That makes it easy to jump in: choose a coin size from the wide range available — the game offers denominations spanning tiny stakes up to heftier ones (coin sizes include values like 0.01, 0.05, 0.1, 0.5, 1, 1.5, 2, 3, 5, 8 and 10) — and set your line bet. The maximum total bet tops out at 100, giving high rollers room while keeping low-stakes players comfortable.

Symbols are big and story-driven: face cards (A, K, Q, J, 10) fill out the lower end of the payouts while the themed symbols — Man, Woman, Lamia, Cyclops and the Book of 99 — deliver the heftier rewards. The Key acts as the scatter symbol that interacts with the bonus mechanics, and the Book of 99 is at the heart of the game’s special features. Simple rules, clear odds and bold artwork make it easy to focus on the fun without wrestling complicated mechanics.

Bonus features that add real upside

Two main bonus rounds power the action: the Free Spins Feature and the Collection Feature. Hit the right combination of special symbols and you’ll trigger ten free spins — a classic chance to push a winning streak without draining your balance. The Collection Feature adds a strategic layer: special symbols you collect across spins track toward extra payouts or upsized prizes, turning ordinary spins into meaningful progress.

Relax Gaming built the extras so they feel rewarding rather than random noise. When the bonus drops, you’ll notice how the pacing and symbol behavior shift to favor bigger payouts and more dramatic wins. The combination of free rounds and collection mechanics means every session can produce a memorable moment, especially when the high-paying themed symbols start landing together.

Smart plays that keep you in the game longer

Play style matters more than chasing maximum bets. Because the game uses one coin per line and provides many coin-size options, you can control session length precisely:

• Start with modest coin sizes to explore how often features arrive. Smaller denominations extend play and give you time to see the Collection mechanics in action.
• Reserve higher stakes for when you spot potential feature setups or bonuses — those ten free spins can multiply returns quickly, so timing bigger wagers around feature triggers can be a smart move.
• Treat the Collection Feature like a progress meter: patience pays. Consistent, measured betting often converts into better value than erratic, high-variance swings.

Bankroll management is simple here: set a limit, pick a coin size that matches that limit, and stick to it. The variety of coin sizes on offer makes it easy to tailor bets to your session goals.

Where Book of 99 sits in Relax Gaming’s lineup

This title fits neatly into Relax Gaming’s catalog — a mix of cinematic design and player-friendly mechanics. If you’re curious about the studio behind the game, check out Relax Gaming to see how this release compares to their other hits.

Book of 99 is a compact, accessible slot with enough bonus depth to reward both casual spins and deliberate play. If you want a game that pairs mythic theme work with straight-up gameplay and meaningful bonus potential, it’s worth a spin. If you spot a limited-time free spins or bonus match offer tied to the game, act quickly — those promotions don’t last forever, and they can amplify what Book of 99 already offers. Play a few rounds, experiment with coin sizes, and let the Collection mechanics build toward those standout wins.