Slots tested on official demo servers. Every spin logged.

Full recorded sessions and a series of bonus buys per game, retested over time, measured RTP with its confidence interval, dead streaks, drawdown and bankroll survival, next to the demo you can play yourself. The rig plays, a human editor checks, the spin log is yours to download.

latest runs Extra Chilli More Chilli spin 10,000

198slots tested
3,370,000rounds logged
12,050bonus buys
22,310natural bonuses

Newest RTP measured RTP declared Hit rate Max win Buy value Bonuses

All slots tested by Slotester Lab

198 slots by name in 21 letters · one link to every review, measured RTP next to each

198 slots

0–9 B C D E F G H I J K L M N P R S T W X Z

0–93

B37

C9

D10

E7

F16

G13

H2

I2

J4

K3

L3

M18

N1

Noche de Almas73.0%

P7

R7

T18

W12

X1

xWays Hoarder xSplit®97.2%

Z2

measured RTP of the published test · colour shows how far it landed from the declared figure

What every test measures

Seven numbers from every test: RTP, hit rate, max win, bonus buy, bonus frequency, dry run and drawdown, by the same procedure for every game

specimen Extra Chilli More Chilli Big Time Gaming · 10,000 rounds 01 / 12

Measured RTP

% of bet

103.3% 96.4%

Total win over total bet across every logged round of the test, runs pooled; the review adds the 95% band that the sample size honestly allows. The hatching runs up to the RTP the studio declares, so a green bar that stops short of it is a test below the declared figure and one that runs past it a test above. The best RTP slots ranking sorts every test by this number.

Σ win ÷ Σ bet ± 1.96·sd/√n

Hit rate

% of rounds

30%

How often a round pays anything at all. The ten cells are ten rounds; the lit ones paid.

rounds with win > 0 ÷ rounds

Max win

x bet

226x

The biggest round of the test that did not trigger a bonus, on a log scale from 10x to 5,000x; the review adds the best round with a bonus, and the highest max win list ranks games by that bigger figure.

max(win ÷ bet), rounds without a bonus

Bonus buy

x price

—not sold in this build

A series of purchases at the listed price: the mean return against the price line, the median and how many returned less than they cost. Ranked on the best bonus slots page.

mean(return ÷ price)

Bonus frequency

bHz

3.9 bHz

Natural bonuses per 1,000 rounds, the lab’s own unit: the trace spans 1,000 rounds and every crest is one bonus. The review adds how long each one ran and what it paid.

natural bonuses ÷ rounds × 1,000

Dry run

rounds

20 rounds

The longest stretch of rounds without a single win, drawn between the two wins that framed it.

max consecutive win = 0

Drawdown and survival

bets

1,508 bets, deepest fall

The balance over the run in bets, the deepest fall from its running peak, and whether 50, 100 or 200 bets would have lasted the run.

max(peak − balance) ÷ bet

Every formula, the pipeline and the checks: how we test →

All tests together

183 of 198 tests within their own margin of error · mean measured RTP 95.5% over 3,370,000 rounds

198 tests · 337 runs · 3,370,000 rounds · updated with every new test

Measured against declared RTP

tests by gap, RTP points

183 / 198 within their own margin of error

beyond own margin: 15 · chance alone ≈ 10 below declared: 116 · at or above: 82

A single run of 10,000 rounds pins the RTP down to about ±16 points, so a gap of a few points is chance, not a verdict. More tests landed below the declared figure than above it: rare big wins lift the average, so the typical test sits slightly under it.

Mean measured RTP

95.5%

declared average: 96.34%
lowest test: 70.5%
highest test: 131.9%

The hatching runs up to the declared average and the green bar to the measured one; single tests spread from the lowest to the highest figure below.

Bonus buys against the price

x price

44 / 134 above price

Each bar is one test: the average return of its bonus buys against the price, the white line. Across tests: 0.94x of the price, from 12,050 bonus buys.

How long a bankroll lasted

spins, log scale

50 bets 120 spins

100 bets 298 spins

200 bets 797 spins

Median spin at which a bankroll of that many bets ran out, all tests together. Only 2, 5 and 11 of 198 tests never exhausted 50, 100 and 200 bets.

Rhythm of the games

9–43% hit rate 114 rounds, longest dry run

From Eye of Horus The Golden Tablet Megaways, where one round in 11 pays, to Sweet Bonanza Xmas, where 4 rounds in ten do. The longest dry run: Eye of Horus Megaways.

What a round pays, all tests together

share of 3,370,000 rounds by win in bet multiples · linear scale

88% of all rounds returned less than the bet. The rest is where every session is decided.

74% nothing
14% 0–1x
4.9% 1–2x
4.3% 2–5x
1.4% 5–10x
0.7% 10–20x
0.5% 20–50x
0.2% 50–100x
0.1% 100–500x
<0.1% 500x+

From the lab

11 reports built from the test logs · latest 2026-10-19

Lab report · 2026-10-19 9 min

What Does a Bonus Buy Return? Bought Bonuses by Provider, Measured Ticket by Ticket

Where a slot sells its bonus, the lab buys it, a long series at the listed price in one session, and logs what every ticket returned. Grouped by provider, those tickets answer the question behind every bonus-buy debate: how much of the price comes back on average, how often a single ticket loses, and whether a cheaper ticket is a better one. This report sets the providers side by side and explains why a bonus that returns more than it costs on average still loses most of the time.

Lab report · 2026-10-19 10 min

How Often Do Slots Trigger the Bonus? Natural Trigger Rates by Provider, Measured

Every slot test in the lab counts the bonus rounds that started on their own, with the buy button left alone, over a long series of logged rounds on the official demo server. Grouped by provider, those counts answer a question players ask in every forum thread: how long do you wait for the feature, and does a provider that makes you wait pay more when it finally arrives? This report puts the trigger interval, the bonus pay and the longest dry waits side by side for every provider in the catalogue.

Lab report · 2026-10-03 11 min

Are Online Slots Rigged? The Same Slot Tested Twice, Run Against Run

The lab runs some slots more than once: same game, same demo server, same stake, a fresh session weeks later. If a game were tuned to pay less after a generous session, or to drift away from its declared RTP, the second run is where it would show. This article compares every re-tested slot run against run, checks whether the gaps are bigger than chance allows, and looks at what happens in the hundred spins after a big win.

All lab reports →

How the lab works

Four steps from the official demo server to a published review · every review ships its logs with SHA-256 checksums

01 Open the official demo The rig talks to the game server the way the game client does and records every response. No simulation, no emulated RNG. 11 studios · official demo servers
02 Play the standard run A full session of rounds at one bet, then a series of bonus purchases where the game sells them, then a real browser session for screenshots and video. Games are retested over time and every run stays on the page; the biggest round of each test feeds the slots with the highest maximum winnings list. 3,370,000 rounds · 12,050 buys · 337 runs
03 Compute, then check Every number comes from the log. Each round is reconciled against the server balance; one mismatch and the run is discarded. win = balance change, every round
04 A person signs off An editor reads the draft against the log and publishes it with the logs and their SHA-256 checksums. 198 reviews published

verify · Extra Chilli More Chilli

~/slotester $ sha256sum extra-chilli-more-chilli-r1-rounds.csv c256d4abc55c83848ff2be8af7ed7f0254545b9065af8e1cc50889024ba33ded extra-chilli-more-chilli-r1-rounds.csv # ✓ the same checksum is printed on the review ~/slotester $ python -c "import csv;from decimal import Decimal as D;r=list(csv.DictReader(open('extra-chilli-more-chilli-r1-rounds.csv',encoding='utf-8-sig')));print(round(100*sum(D(x['win']) for x in r)/sum(D(x['bet']) for x in r),2))" 103.34 # ✓ measured RTP of run 1 on the review: 103.34% ~/slotester $

Open data

Every review ships its logs with SHA-256 checksums.

Download the file, compare the checksum with the one on the page, recompute the RTP in one line. If your number differs from ours, write to the lab and the raw session is re-checked.

This log Its review How we test

different number? lab@slotester.com · about the lab

Questions

6 questions about the lab

What is Slotester Lab?

Lab answer

A slot-testing project that measures games instead of describing them. Software plays each game on its provider's official demo server for full recorded sessions, buys the bonus again and again where it is sold, and a human editor publishes the numbers with the log that produced them.

Are demo servers the same as real-money play?

Lab answer

The demo build runs the provider's game math with virtual credits and reports the RTP profile of that build. What a specific casino adds on top, from bonuses to limits, is outside the test, and we cannot see what an operator serves to its own players.

Why does the measured RTP differ from the declared one?

Lab answer

Because one run is one sample. Volatile games leave a wide confidence interval, and a single run can land above or below the declared figure without anything being wrong. Every review prints that interval next to the number.

Can I check a review myself?

Lab answer

Yes. Each review links to its rounds file and prints the file's SHA-256 checksum. Two commands recompute the checksum and the RTP; the how-we-test page shows them.

Do game studios or casinos pay for reviews?

Lab answer

Studios do not pay and cannot commission tests. Casinos can pay a commission if a reader follows a partner link under a demo; that link cannot change a measured number, a verdict or the order of reviews. The affiliate disclosure page has the details.

Which games can be tested?

Lab answer

Any slot whose server protocol the rig speaks and whose official demo is public. Every game goes through the same fixed procedure, new reviews appear as the rig finishes them, newest first, and published games are retested with new runs over time.

Slots tested on official demo servers. Every spin logged.

Slot catalog

All slots tested by Slotester Lab

0–93

B37

C9

D10

E7

F16

G13

H2

I2

J4

K3

L3

M18

N1

P7

R7

S23

T18

W12

X1

Z2

What every test measures

All tests together

From the lab

What Does a Bonus Buy Return? Bought Bonuses by Provider, Measured Ticket by Ticket

How Often Do Slots Trigger the Bonus? Natural Trigger Rates by Provider, Measured

Are Online Slots Rigged? The Same Slot Tested Twice, Run Against Run

How the lab works

Every review ships its logs with SHA-256 checksums.