Book of 99slots
Observed RTP vs officialpaid รท wagered over the sampled bets, with a 95% band
24h
219.20%ยฑ282.4
93 betsโ
7d
403.66%ยฑ252.6
591 betsโ
30d
220.04%ยฑ119.5
740 betsโ
90d
220.04%ยฑ119.5
740 betsโ
All
220.04%ยฑ119.5
740 betsโ
The marker is the RTP each casino publishes for this game. An amber bar means that figure is outside the 95% band of what we observed there; grey bars are below the minimum sample.
This gameall sampled bets
- Bets
- 3,731
- Wagered
- $10.8K
- Paid
- $39.4K
- Max multiplier
- 2,173x
- Max payout
- $3,050
too earlyNot enough bets over 30d to compare with the official RTP yet. Every spin is independent.
Official RTPas published by each casino
Game factsfrom relax-gaming.com
A slot with wins up to 5,000ร the bet, released in May 2021.
- Bet range
- โฌ0.10 โ โฌ100
- Released
- May 2021
Max win 5,000x, not hit in the feeds since 2 Nov 2026
- Free spins
Demos aren't available in your country. We hide demos where casino links are hidden, and in the UK.
From relax-gaming.com ยท read 1d agoStudio page โ, opens in a new tab
Multiplier distribution30d, sampled bets
792 sampled spins, 38% of them paid something.
- 1 in 22
- sampled spins paid 10x+
- 6 spins
- paid 100x+, too few to put a 1-in-N figure on
- 0 spins
- paid 1000x+ in this sample
0
0-1
1-2
2-5
5-10
10-50
50-100
100-1000
1000+
- Observed swings
- Compared once a slot has 20,000 sampled spins staked $0.10 or more in this window; this one has 614.
From 792 sampled spins; a small sample swings a lot, and every spin is independent. Bar height is square-root scaled so the rare high buckets stay visible. Hover a bar for the count.
Where it is played30d, share of sampled wagering
When players play30d ยท sampled bets by UTC hour and weekday, since 2 Nov 2026
MonTueWedThuFriSatSun
by hour
Busiest hour: Fri 03:00โ04:00 UTC with 215 bets; busiest time of day: 02:00โ03:00 UTC; busiest day: Wed. Observed on the public feeds we read, a sample: when people were seen playing, not when anyone should. Hours are UTC.
Biggest hitslargest payouts we saw on this game
Live RTP by casino30d, refreshes on reload
| # | Casino | Observed RTP | Official | Dev. | Bets | Wagered |
|---|---|---|---|---|---|---|
| 1 | Housebets | 57.27%ยฑ44.0 | 99.00% | โ | 266 bets ยท below min | $27.50 |
| 2 | Rainbet | 58.44%ยฑ47.0 | 99.00% | โ | 256 bets ยท below min | $436 |
| 3 | Duel | 7.72%ยฑ6.63 | 99.00% | โ | 68 bets ยท below min | $29.78 |
| 4 | Gamdom | 1106.60%ยฑ677.0 | 99.00% | โ | 66 bets ยท below min | $111 |
| 5 | 500 Casino | 90.15%ยฑ26.8 | โ | โ | 60 bets ยท below min | $9.87 |
| 6 | Shuffle | 7.68%ยฑ15.2 | 99.00% | โ | 10 bets ยท below min | $13.02 |
| 7 | Stake | 83.73%ยฑ161.2 | 99.00% | โ | 8 bets ยท below min | $92.88 |
| 8 | BC.Game | 87.48%ยฑ108.6 | โ | โ | 4 bets ยท below min | $12.02 |
| 9 | Yeet | 11575.17%ยฑ17003.0 | โ | โ | 2 bets ยท below min | $0.12 |
About Book of 99from the figures on this page
Book of 99 is a Relax Gaming slot. Over the last 30 days we observed 3,731 bets on it at 15 casinos, too few to measure its RTP over 30 days; the official RTP is 99.00%. Its highest multiplier in the last 30 days was 2,173x. The biggest win we saw on it paid $3,050 (137.5x) at Razed on 11 Nov 2026. Over the last 30 days it was played most, by wager, at Rainbet, Gamdom and Stake.
More from Relax Gaming30 days, by observed wagering
Pine of Plinko 2172.28%
