Book of 99

Intro

Screenshots

The first thing you’ll notice about Book of 99 is its RTP percentage, which sits way above average at 99%. RTP is a measurement of a slot’s payout rate, providing a rough estimate of how much players can expect to receive back from a slot over time. An RTP of 99% means that, on average, players will receive £99 back from every £100 wagered. However, these percentages are calculated from millions of simulations, so you should always take this figure with a pinch of salt.

Part of the thrill of gambling is that you never know what you might win. Although RTP rates can give a rough estimate, a slot’s variance, or volatility, is the component that provides variety in the rate. Book of 99 is classified as having high volatility, which means it’s expected to pay out larger amounts at infrequent rates. This makes the game more suitable to those with bigger bankrolls.

In terms of gameplay, Book of 99 takes place on a simple 5×3 grid. Players are looking to match winning combinations from left to right, with standard playing cards comprising the lowest-paying symbols. The remaining symbols are made up of characters from Greek mythology, and landing combos of these will bring bigger rewards. You’ll only need to hit two of these higher-paying symbols along a payline to win a small cash prize.

This slot’s predominant bonus feature is the free spins round, and there are two ways to trigger this. The first and easiest way is to land three of the scatter symbols – the eponymous book, which also serves as the wild – anywhere on the reels.

You’ll notice these scatters being collected in a meter to the left of the reels each time they land. If you manage to collect 99 of them, this will also trigger a round of ten free spins.

Before the free spins take place, the book will open to reveal one symbol. This symbol is to become the nominated stacked wild for the duration of the free spins round; if you land three of these symbols in a single spin, each of them will fill their entire reel, generating bigger wins.

Unfortunately, any book symbols that appear during the free spins won’t contribute to your overall collection, but landing an additional three on one spin will reset the bonus round.

Modern online casinos cater as much to the mobile player as they do to the desktop. This means you can spin the reels of Book of 99 on the go – whether that’s in your mobile browser or on your casino’s native app. If you can, we recommend the latter, as doing so offers a slicker gaming experience, and allows for more targeted promotions.

Relax Gaming has chosen ancient Greece as the setting for Book of 99, and we enjoy the cool, Aegean waters that calmly hum under the moonlight in the background. If you manage to launch the free spins bonus, you’ll be transported to a daytime set of reels that looks like something out of Disney’s Hercules. The reels themselves are laid within an ancient temple, and the bonus meter charts a route across the sea towards mainland Greece.

It’s a simple design and a tried and tested theme, but it’s beautifully presented. In particular, the motion of the book scatters collecting in the meter is consistently pleasing – even watching it happen for the 100th time! The tumbling soundtrack adds tempo to the scene, but if there’s a lull in gameplay, this makes way for the natural sounds of the Grecian coastline.