Book of 99

4.4 / 5
· RTP 99%

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Title screen for Book of 99

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100% Deposit Match, up to $1,000 Plus $25 On The House

Welcome Bonus

97.56%

Payout in 1-3 days

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Slot Information

Reels
5
Jackpot
Normal
RTP

Return to player

RTP stands for ‘return to player’, and refers to the expected percentage of wagers that a slot or casino game will return to the player in the long run. The higher the RTP = The more chance of a cash return.

  • Low RTP:

    -90%

  • Medium RTP:

    90 - 95%

  • High RTP:

    95% +
99%
Max Win
12,075x your bet
Paylines
10
Free Spins
Yes
Multipliers
Yes
Min Bet
$0.10
Max Bet
$11

Pros

Huge RTP of 99%

Free spins round with lucrative prizes to be won

Cons

May feel overly complex for players who prefer traditional slot games

No progressive jackpot

Expert Ratings

4.4 / 5
Graphics
5.0
Bonus Round
4.5
Sound
3.0
Entertainment
5.0

How we rate

Find out how we rate and review slot games. Learn about the criteria we use to assess slot games, which includes everything from RTPs to jackpots.

For more information visit How we rate.

How we rate

Gallery

Verdict

Relax Gaming is well known for its fast-paced, original online slot machines. So it’ll come as no surprise that this top quality developer has exceeded expectations once again with the release of Book of 99. Designed to compete with other, similarly themed online slots, the game is feature-rich, brilliantly detailed and full of new and exciting ways to win.

There are great opportunities to maximise winnings through the free spins round, and the collection feature is good addition to this highly immersive, entertaining game. Try it out on a desktop or mobile to find out why our team can’t resist this Relax Gaming classic.

Paytable

Book of 99 paytable

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Disclaimer

Any featured links, displayed to our visitors in the State of New Jersey, linking to 3rd party operators are free non-commercial links and onlineslots.com has no financial incentive in relation to these links.

There's no financial incentive in relation to these links
BetMGM logo

100% Deposit Match, up to $1,000 Plus $25 On The House

Welcome Bonus

97.56%

Payout in 1-3 days

Get your bonus