This addition to the popular free spins feature makes the game more profitable than most other slots, bringing the overall RTP of the game up to 99%.ĭuring free spins, you will have a chance to win up to 5,000x your bet on every spin. Players are also given a chance to collect 99 books on separate spins, which guarantees the feature is triggered when the number is reached.

Like most “book” slots, Book of 99 activates free spins when three book symbols appear on the grid, but that is not all. The game’s Ancient Greek theme will be familiar to most slot lovers out there, while the expanding symbol feature during the free spins is one of the most popular features in the world of slots. Book of 99 – Relax Gaming (99% RTP)īook of 99 by Relax Gaming follows a familiar gameplay pattern that has been tried and tested in dozens of other video slots, but with a slight twist. If you haven’t had a chance to try Ugga Bugga earlier, give it a shot and find out for yourself why we placed it on our list of best slot machines to play at the casino. This can make for some amazing winning spins, as well as many break-even spins, which reduces the volatility and allows you to play for higher stakes than you could normally. The game's mechanics are unique, allowing you to spin the single three-symbol payline once, hold your favorite symbols, and then re-spin them on all ten of the game’s paylines. The game’s Africa theme and simple set of sounds and graphics actually make for an enjoyable gameplay experience as well, although the game runs a bit slow compared to some of the more modern slots out there. However, this old-school Playtech slot machine has a ton to offer, not the least of which is its impressive 99.7% RTP rate, higher than any other slot on our list. If you are used to modern video slots with flashy graphics, animations, and bonus rounds, Ugga Bugga might be a bit of an adjustment when you first start out.

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