Relax Gaming
Book of 99
Play Book of 99 slot by Relax Gaming for free in demo mode! Explore RTP, bonus rounds, and key features before playing for real.
RTP
99%
return to player
Volatility
High volatility
variance
Max win
12,075×
top multiplier
Min bet
$0.10
per spin
Reels
5
10 lines
Player rating
4.7 ★
15 votes
Why this score
High confidence (100%)Five weighted signals shape the composite. Four context signals refine ties. See how we rate for the full methodology.
Payouts & RTP10/10
RTP 99% → 10.0/10
Volatility9/10
high → 9.0/10
Win Potential8.2/10
x12075.00 (12075×) → 8.2/10
Features8/10
13 features → 8.0/10
Game Mechanics10/10
f=13 r=5 p=10 → 10.0/10
Context signals (tie-breakers)
Layout6/10
5x3 → 6.0/10
Bet Flexibility6/10
0.1–100 (×1000) → 6.0/10
provider avg 8.0 → 8.0/10
Popularity8/10
synthetic proxy → 8.0/10
DEMO Play free, no signup
Relax Gaming
Spec sheet
Book of 99 at a glance.
Math
Index score86
RTP99%
VolatilityHigh volatility
Max win12,075×
Bet range$0.10 – $100.00
Player rating4.7 / 5 · 15 votes
Format
Reels5
Paylines10
Layout5x3
Features
Themes
Compare Book of 99 with other games
 Book of 99 Score 86This game |  Book of Trojan Tales Score 66 |  Book of Helios Score 79 |  Pandora’s Treasure Score 80 |  Book Of Maya Score 59 | |
|---|---|---|---|---|---|
| Identity | |||||
| Studio | |||||
| Released | 5/4/2021 | 6/17/2024 | 6/16/2022 | 5/2/2024 | 1/13/2022 |
| Math | |||||
| RTP | 99% | — | 95.58% | 96.13% | — |
| Volatility | High volatility | — | High volatility | Medium volatility | — |
| Max win | 12,075× | 5,000× | 20,168× | 10,368× | — |
| Format | |||||
| Reels | 5 | 5 | 5 | 6 | 5 |
| Layout | 5x3 | 5x3 | 5x3 | 6x4 | 5x3 |
| Paylines | 10 | 10 | 10 | 4096 | 10 |
| Min bet | 0.10 | 0.10 | 0.10 | 0.10 | 0.15 |
| Max bet | 100.00 | 100.00 | 10.00 | 40.00 | 30.00 |
| Features | |||||
| Progressive | — | — | — | — | — |
| Wild symbol | ✓ | ✓ | ✓ | — | ✓ |
| Free spins | ✓ | ✓ | ✓ | ✓ | ✓ |
| Scatter symbol | ✓ | ✓ | ✓ | ✓ | ✓ |
| Multiplier | — | — | ✓ | — | — |
| Bonus game | — | — | — | — | — |
| Respins | — | — | — | — | — |
Every number is shown as a delta against Book of 99.
Comparing against
Book of 99
Relax Gaming
RTP
99%
Max win
12,075×
Score
86
Book of Trojan Tales
Spinomenal
RTP
—
Volatility
—Max win
5,000×▼−7,075
Score
66▼−20
Same feature set
Book of Helios
Betsoft
RTP
95.58%▼−3.4
Volatility
High volatilityMax win
20,168×▲+8,093
Score
79▼−7
+ Multiplier
Pandora’s Treasure
NetEnt
RTP
96.13%▼−2.9
Volatility
Medium volatilityMax win
10,368×▼−1,707
Score
80▼−6
− Wild
Book Of Maya
Funky Games
RTP
—
Volatility
—Max win
—
Score
59▼−27
Same feature set
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