Key Facts
Book of 99 is a high (5/5)-volatility online slot from Relax Gaming with an RTP of 99.00% and a maximum win of 12075.00x.
- Provider
- Relax Gaming
- RTP
- 99.00%
- Volatility
- High (5/5)
- Max win
- 12075.00x
- Layout
- 5×3
- Paylines
- 10
- Released
- 2021
Page updated July 2026
Where to Play Book of 99
18+ | Play responsibly | Ad — we may earn a commission from these partners.
Game Review
The Book of 99 slot features Relax Gaming's High (5/5) volatility engine with a 99.00% RTP coefficient and 12075.00x peak win potential.
Book of 99 FAQ
What is the RTP of Book of 99?+
Book of 99 has an RTP (return to player) of 99.00%. RTP is the theoretical percentage of total stakes a slot returns to players over a very large number of spins, as published by Relax Gaming — individual sessions can land far above or below it.
How volatile is Book of 99?+
Book of 99 is rated high (5/5) volatility. High-volatility slots pay out less often, but wins tend to be bigger when they land — expect longer dry spells and larger swings to your balance.
What is the max win on Book of 99?+
The advertised maximum win for Book of 99 is 12075.00x. Max wins are extremely rare by design — treat them as a ceiling, not an expectation.
Who makes Book of 99?+
Book of 99 is developed by Relax Gaming and was released in May 03, 2021.
What is the layout of Book of 99?+
Book of 99 plays on a 5×3 grid with 10 paylines.
Tech Specs
Specs compiled from provider data
