The number that made the game unusual
Why 99% is such a big deal.
Book of 99 launched as Relax Gaming’s first Book slot with a 99% RTP. Put simply, across a huge amount of play the game is designed to return €99 in prizes for every €100 wagered, leaving a theoretical €1 house edge.
It is still not a promise for tonight. A €100 deposit does not turn into €99 on cue. Random results, sharp swings and the timing of Free Spins can leave one session far above or below that long-run average.
Read the full RTP and paytable guide →See what each RTP point is worth.
Turnover means every paid stake added together, including winnings you choose to spin again. It is much bigger than a starting deposit during a longer session.
more allocated to theoretical prizes at 99% across €1,000 of turnover than at 96%.
This comparison explains the published percentages; it cannot predict or smooth out your own results. Always confirm the RTP shown inside the live game before playing.
The number in the game
Relax Gaming publishes 99.00% for Book of 99. Confirm that figure in the help panel of the version you are about to play.
What your session can look like
Your own return can be 0%, above 100% or anywhere between. A short run is not expected to settle neatly around 99%.
Check before you spin
Open the live paytable and confirm its RTP, stake range and win limits before putting real money into play.
High RTP is not low volatility.
RTP describes the long-run share returned as prizes. Volatility describes how unevenly those prizes may arrive. Book of 99 can still produce long losing sequences, quiet Free Spins or a full-budget loss in one session.
VerifiedRTP 99.00%, stake range €0.10–€100 and maximum win 5,000× are published by Relax Gaming.
Interactive paytable
See what every regular symbol pays.
Choose a symbol to reveal the official help-screen values shown at a €2 current bet. Reopen the live paytable whenever you change stake.
High-pay symbol
Hero
2×2
3×20
4×200
5×1,000
Pay order
How the game counts a line win
- Matching combinations are read from the leftmost reel.
- Only the highest-paying combination on each line is awarded.
- Prizes from separate paylines are added together.
- The Book substitutes for regular symbols outside the selected expansion rule.
