10,000 SPINS DEMO SERVER REVIEW PENDING

Relax Gaming · tested 2026-09-19

Book of 99

Three full-screen expansions landed in this Book of 99 review: the one that drew the top symbol paid FUN 10,000, the two that drew card royals paid FUN 200 each, and the demo returned 137.22% RTP.

RTP declared → measured 99.00 → 137.2%
Hit frequency 30%
Max win · base game 101x
Free spins, natural 73 / 10,000

Test card

10,000 spins · FUN 2.00 bet · every request logged

Spins	10,000
Bet	FUN 2.00
RTP declared	99.00%
RTP measured	137.22% (approximate 95% CI 37.6–236.9)
Hit frequency	30% · every 3.32
Dead streak max / avg	18 / 3.35
Median hit	0.50x
Max win (base game)	101.0x · spin 1700
Free spins, natural	73 · every 137 spins · mean FS-only payout 124.0x stake
Balance start → end	5,000 → 12,444

Balance in bets over the base series

Win distribution, x bet

test logs · 1 run · every request loggedtest record ↓

012026-09-1910,000 rounds · 0 buysfiles & checksums ↓137.22%RTP4 files · SHA-256 ↓

each run keeps its own spin log, CSV and raw server journal with checksums; the figures on this card combine all runs

Play Book of 99 demo

same math as real play · demo balance

Free demo · no registration · plays on the provider's official server · 18+ Responsible gambling

Free spins on video

natural trigger · 73 in 10,000 spins

REC · NATURAL TRIGGER

Natural free spins caught on media spin 67: FUN 105 returned from 10 spins. Recorded in a separate browser session, outside the statistical samples.

Across the whole run the 73 natural bonuses split into 15 under 20x, 23 between 20x and 50x, 21 between 50x and 100x and 14 at 100x or more, and together they made up 66% of everything the game returned. The wait between two triggers ran from 5 to 319 spins. Payout figures here are FS-only, in ordinary stakes; the trigger payout is excluded.

Three Wild symbols inside the feature add 10 spins. The share counts rounds that ran past their 10-spin start; the 99-Wild meter opens a separate round and is not a retrigger.

triggers 73 1 per 137 spins
every 137 spins gaps 5 to 319
mean 124.0x FS-only median 39.5x stake
best 5,041.0x round 1956
spins per bonus 11.8 10 to 30 observed

Trigger mapevery natural bonus of the run · height = result, log scale · amber = top 4

Best bonuses

01round 195610 spins5,041.0x
02round 444330 spins185.5x
03round 29210 spins168.0x
04round 690830 spins146.5x

Risk profile

how much bankroll this run needed

1,488xmax drawdown, in bets (by spin 9495)

-178xlowest point vs start

18longest dead streak, spins

Bankroll survival in this run

50 bets	bust at spin 69
100 bets	bust at spin 150
200 bets	survived all 10000 spins

One run, one bet size. A different session can bust earlier or never; treat this as a measured example, not a rule.

How it plays

15 rules screens from the game

RULES · FROM THE GAME

screen 01 / 15 Book of 99 rules, page 1

Book of 99 is a five-reel, three-row book slot with 10 fixed lines that pay from the left. The explorer tops the table at 500x the stake for five on a line, the sorceress pays 200x, the ogre and the horned sorceress 75x, and the five card royals 10x to 15x; two of the top four symbols already pay. The Wild stands in for every symbol and is also the trigger: three or more anywhere start 10 free spins, and the same three Wilds award 10 more inside the feature.

The second road to the feature is the meter beside the reels. Every Wild that lands in ordinary play adds one, and at 99 the game opens a separate 10-spin round and resets the count, keeping any surplus. In the logged series 3,691 Wilds arrived, 0.37 per spin, so the meter filled every 224 to 333 spins, 37 times in all, while three Wilds on one screen came 36 times with gaps from 7 to 1,069 spins.

At the start of each free-spin round one of the nine paying symbols is drawn at random as the special symbol. Whenever enough of it lands, two for a high symbol or three for a royal, it expands over its reels and pays on all 10 lines regardless of position, after the ordinary line wins of that spin. Which symbol is drawn decides the round: in this series the explorer averaged 666x per round over eight draws, the queen 34x over eight.

The rules print a 99.00% return, a 12,075x cap and a stake range of FUN 0.10 to FUN 100 per spin. This demo carries no bonus purchase and no ante option.

Specs

RTP 99.00%
Volatility High
Max win 12,075x
Provider Relax Gaming
Reels 5
Paylines 10
Bet range 0.10 – 100.00 FUN

Mechanics5 from the rules screens

Wild symbol
Scatter symbol
Free spins
Expanding symbol
Retrigger

Paytable

x total bet · bar = top payout on a log scale

symbol 2345

Wild book 1x 10x 100x 500x

Explorer 1x 10x 100x 500x

Sorceress 0.5x 4x 40x 200x

Ogre 0.5x 3x 10x 75x

Horned sorceress 0.5x 3x 10x 75x

A — 0.5x 4x 15x

K — 0.5x 4x 15x

Q — 0.5x 2.5x 10x

J — 0.5x 2.5x 10x

10 — 0.5x 2.5x 10x

Bet range FUN 0.10 – 100 per spin · payouts read from the game's paytable at bet FUN 2.00

Gallery

8 frames from the test

FRAMES · LAB RUN · 01/08

01Book of 99: Board at the FUN 2 stake with the Wild-collection meter empty on the left

02Book of 99: Three Wild books on reels one, three and five open the free spins, meter at 26

03Book of 99: Result of the natural round: FUN 105 after 10 free spins, meter at 29

04Book of 99: Five jacks on a V-shaped line pay FUN 20, meter at 22

05Book of 99: Ogre pair pays FUN 8 while the meter reads 21 Wilds

06Book of 99: Two Wild books push the meter to 35, FUN 3 on the line

07Book of 99: Two horned sorceresses pay FUN 8 with the meter at 43

08Book of 99: The meter lights up at 32 as a Wild book lands for FUN 6

Verdict

Same full screen, fifty times the money

The series returned 137.22% of stake against the 99% in the rules, and one round explains the gap: round 1956 paid FUN 10,088, 5,044x, after the explorer was drawn as the special symbol and covered all fifteen positions on the fourth free spin, ten lines of five at 500x each. Without that round the other 9,999 spins returned 86.78%. The approximate 95% band, 37.6 to 236.9%, is the widest the lab has printed, which is what a single 5,000x round does to the arithmetic.

The two roads to the feature paid differently. The 37 rounds opened by the meter came like clockwork, one per 224 to 333 spins, and averaged 51x the stake with a 37.5x median; the 36 rounds opened by three Wilds averaged 199x, or 56x without round 1956, with gaps from 7 to 1,069 spins. Five rounds on each road retriggered, the longest ran 30 spins from round 590, and 15 of the 73 rounds paid under 20x.

Ordinary play is a delivery service. Something paid on 29.6% of ordinary spins, mostly at 0.5x, no ordinary spin passed 101x, and the balance sat 178 stakes below the start before spin 1956 lifted it 5,043 stakes in one round. Expansions are the money: 736 of the 860 free spins expanded at least one reel and those pays were 59.8% of everything the series returned. Three expansions covered the whole screen, and the two that drew a royal, the 10 on round 7201 and the jack on round 9497, paid FUN 200 apiece against FUN 10,000 for the explorer.

Measured upsides

Free spins came 73 times in 10,000 spins, one per 137, with the meter delivering a round every 224 to 333 spins on its own
A single full-screen explorer expansion paid 5,044x on round 1956; the cap sits at 12,075x
Ordinary spins paid on 29.6% of attempts and the longest drought was 18 spins
Every free-spin round is logged with its drawn symbol, expansions and retriggers

Measured downsides

The special symbol is a random draw: eight explorer rounds averaged 666x, eight queen rounds 34x
Take out round 1956 and the series returned 86.78%, twelve points under the printed 99%
No ordinary spin passed 101x; 32.9% of the return came from the base game
No bonus purchase and no ante option here, and fifty stakes lasted only 69 spins

Test record

10,000 rounds · 0 buys · open data · closed rig

One test run so far: a single session of the base game plus a separate series of bonus purchases on the official demo server, every request and response logged. When the game is tested again, the new run is added here and the figures on this page combine all runs into one sample.

result of this run2026-09-19

Measured return 137.22% 95% band 37.6–236.9% · declared 99.00%

10,000rounds logged
30%rounds that paid
5,044xbiggest round
1 / 137natural bonus rate
18longest dry streak

return of this run with its 95% banddeclared 99.00%

Run 1 · 2026-09-1910,000 rounds

137.22%95% band 37.6–236.9%

30%50%70%90%110%130%150%170%190%210%230%declared 99.00%

dot = measured return · whisker = the range the long-run value is likely to sit in, given this many rounds

how the return settled, round by round10,000 rounds

137.22% after 10,000 roundsdeclared 99.00%

line = return measured up to that round · the line swings early and calms as rounds pile up

The run · tap to open

01run

Run 012026-09-19

10,000 rounds at FUN 2.00 · 0 buys · rig 0.6.0 · RTP profile 99.00%

measured return137.22%+38.2 pts vs declared

95% band37.6–236.9%

natural bonuses73 · 1 / 137

biggest round5,044x

95% band: 37.6–236.9%
rounds that paid: 30%
biggest round: 5,044x · round 1,956
longest dry streak: 18
natural bonuses: 73 · one per 137 rounds
balance start → end: 5,000 → 12,444
deepest drawdown: 1,488x

Download this run · the square button copies the file’s SHA-256, so you can confirm the download is unchanged

10000 ordinary paid rounds, including naturally triggered features, at a fixed FUN 2.0 bet on the official Relax Gaming demo server (jurisdiction MT, RTP profile 99.0%); every request and response logged; test run 2026-09-19.

The test rig recorded every round on the official demo server. Screenshots and video were captured in a separate browser session and are not part of the statistical samples. This release has completed automated data, content and page checks; human editorial review is pending. How we test →

CLOSED RIG OPEN DATA

FAQ

8 questions · answered from the log

Book of 99 RTP: does the demo really pay 99%?

Lab answer

The logged series returned 137.22% at FUN 2, with an approximate 95% band of 37.6 to 236.9% around the 99.00% printed in the rules. One round, 5,044x on spin 1956, carried the surplus; the remaining 9,999 spins returned 86.78%. A single run cannot confirm or deny the 99% figure.

The 99 Wild meter: how is it filled?

Lab answer

Each Wild in ordinary play adds one to the meter, and at 99 a separate 10-spin free-spin round starts. Wilds landed 3,691 times in 10,000 spins, 0.37 per spin, so the meter filled 37 times, once every 224 to 333 spins; those rounds averaged 51x the stake with a 37.5x median.

Three Wilds or the meter: which pays more?

Lab answer

In this series the 36 rounds from three Wilds averaged 199x the stake and the 37 meter rounds 51x, but the difference is one round: without the 5,044x on spin 1956 the Wild-triggered rounds averaged 56x. Both roads open the same 10-spin feature with a random special symbol, and five rounds on each road retriggered.

What happened on the 5,044x round?

Lab answer

Three Wilds on spin 1956 opened the feature with the explorer as the special symbol. Spin two expanded reels four and five for FUN 20, spin four landed the explorer on all five reels and paid FUN 10,000, ten lines of five at 500x, and the remaining spins added FUN 62. The balance went from FUN 4,815 to FUN 14,901 in that round.

Does the drawn symbol matter that much?

Lab answer

It decides the round. Across 73 rounds the explorer was drawn eight times and averaged 666x, the jack twelve times at 52.5x, the queen eight times at 34x. Three expansions covered the whole screen: the explorer's paid FUN 10,000, the jack's on round 9497 and the 10's on round 7201 paid FUN 200 each.

How often do the free spins retrigger?

Lab answer

Ten of the 73 rounds did, five from each trigger road: three Wilds inside the feature add 10 spins. Round 590 ran 30 spins and paid 77.5x; four rounds ran 20 spins. In total the 73 rounds played 860 free spins, and 736 of them expanded at least one reel.

Book of 99 bonus buy: does it exist?

Lab answer

No. The demo offers neither a purchase option nor an ante bet, and its rules carry one return figure, 99.00%. The meter is the substitute: a guaranteed round every 224 to 333 spins in this series at FUN 2 per spin, 37 of them in 10,000 spins.

How dry is the base game?

Lab answer

Not very, but thin: ordinary spins paid on 29.6% of attempts, the median hit was 0.5x, the longest drought was 18 spins from round 1654, and no ordinary spin passed 101x. Base-game wins were 32.9% of the return; the balance dipped to 178 stakes down on spin 1699 before the record round.