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Pay Lines: 10 Free Spins: Yes Bonus Rounds: Yes Fun to Play Score: 9 out of 10 As the name of the game itself suggests, Book of 99 is a great slot game by Relax Gaming, and it comes with an RTP rate of a whopping 99%, which is mesmerizing. betting online indonesia Its grid contains 5 reels and 3 rows, and this slot also has a high volatility rate. betting online indonesia