Another notable example of a high-paying online slot machine is "Book of 99," which has become well-known due to its astounding RTP ocolor prediction game appf 99 percent. This game has a unique mechanic that lets players unlock multipliers and free spins in addition to an interesting plot. Also, Microgaming's "Thunderstruck II" is praised for both its intriguing Norse mythology theme and its roughly 96–65 percent RTP.
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