The studio name on a slot tells you more than who drew the symbols. It tells you how much you are allowed to know before you stake anything.
Some studios publish the return, the hit frequency and the odds of the maximum win. Others publish four returns in one line and leave you to guess which one your lobby bought.
That gap is the only thing on this page worth your attention, because it is the gap between knowing what a game costs and finding out afterwards.
Every figure below comes from a slot reviewed on this site, where it was read off the studio’s own material. I have not ranked studios by how fun their games look.
What the Studio Decides, and What the Casino Decides
People mix these two up constantly, and it costs them money in the wrong place.
The studio builds the mathematics. Reels, paylines, hit frequency, the shape of the bonus, the ceiling on the biggest win. None of that changes between one casino and another.
The casino decides everything around it. Which build of a game it licenses, whether you can read the information panel, what your bonus wagering looks like, and what ceiling sits on your withdrawal.
| Decision | Who makes it | Can you change it? |
|---|---|---|
| Reels, paylines, bonus shape | The studio | No |
| Hit frequency and volatility | The studio | No |
| Maximum win and its odds | The studio | No |
| Whether those numbers are published | The studio | Only by choosing a studio |
| Which build of the game is served | The casino | Yes, by choosing a lobby |
| Bonus wagering and max bet | The casino | Yes |
| Withdrawal ceiling | The casino | Yes |
The rows you can act on are all in the bottom half, and they all belong to the operator. That is why the casino reviews on this site carry a score and the studios do not.
The Disclosure Ladder, Measured
Here is what each studio actually published for the game I reviewed. Not a reputation, not a vibe, just what was printed and what was missing.
| Studio | Game I read it on | Returns published | Hit frequency | Odds of the maximum win |
|---|---|---|---|---|
| Nolimit City | Fire in the Hole xBomb | 96.06, plus DX1 at 94.11 and DX3 at 90.02, each labelled | 25.98 percent | 1 in 2,400,000 |
| Nolimit City | Duck Hunters | 96.05 percent | 17.07 percent | 1 in 22,000,000 |
| Relax Gaming | Money Train 5 | 96.1 percent at the standard setting | 19.57 percent in Standard | Not published |
| NetEnt | Starburst | 96.09 on the studio page, with other versions in circulation | 22.6 percent on the top version | Not published |
| Push Gaming | Razor Shark | 96.70 percent | Not published | No cap published at all |
| Play’n GO | Legacy of Dead | 96.58 as the default, with four more | Not published anywhere | Not published anywhere |
| Pragmatic Play | Sweet Bonanza Xmas | Six figures across three ranges, none labelled | Not published | Not published |
| Hacksaw Gaming | Wanted Dead or a Wild | Four returns in one line, no labels | Not published | Not published |
| Greentube, part of Novomatic | Book of Ra | 92.13 percent | Not published | Not published |
Each row was read while writing that game’s review and the review carries the date of the check. A studio can be better on one title than another, so the game is named in every row rather than implied.
Nolimit City is alone at the top, and it is not close. It labels its reduced builds instead of hiding them, and it publishes the two numbers that actually describe how a session feels.
At the bottom, Book of Ra is the one row where the return itself is the problem. At 92.13 percent the house keeps 7.87 of every hundred euros staked, which is more than twice what the better builds above it keep.
Why One Game Can Carry Two Prices
This is the part of the industry that surprises people, and it is entirely normal practice.
A studio builds several versions of the same hit. The reels look identical and the bonus behaves the same way, but the return is set lower on one of them. The operator chooses which version to license, and the cheaper one pays the operator more.
Nothing on the game tile announces which version you have opened. The only place the figure appears is inside the information panel, and only if the lobby lets you reach it.
Legacy of Dead has a default of 96.58 percent and four more versions behind it. Sweet Bonanza Xmas has six figures across three ranges. Those are not errors, they are the catalog.
The full arithmetic on what that difference costs an hour sits on the Pragmatic Play provider page, because Pragmatic is where the spread is widest among the studios reviewed here.
How to Check a Game Before You Deposit
The check works on any slot from any studio and takes about a minute. The longer version, with every published return I have read, sits on my page about how to find a slot’s RTP.
| Step | What you are doing |
|---|---|
| 1 | Open the game in demo mode, before any deposit decision |
| 2 | Open the information panel, usually behind an “i” button or the menu |
| 3 | Read the return to player and write down the exact figure |
| 4 | Look for a hit frequency and the odds of the maximum win while you are in there |
| 5 | Repeat at a second casino and compare the same figures |
Step four is free information that most players never look at, and it is what separates a slow evening from a flat one. Step five is the only step that produces a decision.
If the panel is missing or empty, that is a verdict on the operator rather than on the studio. The studio builds the panel. The lobby decides whether you can open it.
Provider Pages on This Site
Each provider page prices a studio rather than praising it. Which of the casinos reviewed here carry it, what its games cost per hour, and where its published figures stop.
More studios will get their own page as the slot reviews behind them build up. A provider page is only worth writing once there is enough measured material to say something a press release would not.
How I Checked These Numbers
Every figure in the disclosure table was read while writing that game’s review, from the studio’s own game page or its published data sheet. The review carries the date of that check, and the game is named in each row so you can go and look.
Where a row says “not published”, it means I looked and found nothing, not that I did not look. If a studio has since published a figure, write to me and I will correct the row and date the change.
I have deliberately not scored the studios out of ten. A score belongs on an operator, because an operator is something you choose. The studio arrives with the game.
Where to Go Next
Where to Play These Studios for Real Money
The studio arrives the same everywhere. The operator decides which build you get and how easily the money comes back out, so that is the choice worth spending time on.
FAQ About Game Providers
What is a game provider?
It is the studio that builds the game and its mathematics, then licenses it to casinos. The casino runs the lobby and the account. The studio decides the reels, the hit frequency and the ceiling on the biggest win, and none of that changes between operators.
Does the provider affect my chances of winning?
It sets them, which is not the same as helping you. The return and the hit frequency are built into the game before any casino sees it. What a good studio gives you is the ability to read those numbers before you stake rather than after.
Which provider publishes the most information?
Of the studios behind the slots reviewed here, Nolimit City by a distance. On Fire in the Hole xBomb it publishes 96.06 percent plus two reduced builds that it labels outright, the hit frequency at 25.98 percent and the odds of the top win at 1 in 2,400,000.
Why do some games have more than one RTP?
Because the studio builds several versions and the operator picks one. The cheaper build pays the operator more. Legacy of Dead has a default of 96.58 percent with four more versions behind it, and Sweet Bonanza Xmas has six figures across three ranges.
How do I know which version my casino is serving?
Open the game in demo mode and read the information panel, because the figure is printed inside the game rather than on the tile. Then do the same at a second casino, since one number on its own gives you nothing to compare it against.
What is hit frequency and why does it matter?
It is the share of spins that return anything at all, and it is what you actually feel. Two games can both return 96 percent while one drips steadily and the other pays nothing for an hour then lands once. Duck Hunters publishes 17.07 percent and Starburst 22.6 on its top version.
Are some providers rigged?
The studios behind the games reviewed here are tested by independent laboratories and licensed in regulated markets, so the games do what their published mathematics says. The real risk is not a rigged reel, it is a published return you never read and a build you were never told about.
Should I pick a casino based on its providers?
Only as a last filter. The big studios are in almost every lobby, so the logo wall narrows nothing. Pick on licence, bonus terms, withdrawal ceiling and support first, then check that the studio you like is there.
Does a bigger maximum win mean a better game?
Not on its own, and the odds matter far more than the headline. Duck Hunters caps at 30,000 times the bet with the odds published at 1 in 22,000,000, which at six hundred spins an hour is tens of thousands of hours for one expected hit.
Which studios have their own page here?
Pragmatic Play has one, with the full hourly arithmetic and the list of casinos carrying it. More will follow as the slot reviews behind each studio build up, because a provider page is only worth writing once there is measured material to put in it.
Who Wrote This
I came to this from finance, where a product that hides its terms is judged on that alone. A slot studio that publishes the odds of its own top prize is making a different offer from one that prints four returns in a row and walks away.
I am responsible for everything published here. Every figure in the table was read from the studio’s own material while writing that game’s review, and each review carries the date of its last check. If one stops holding, write to me and I will correct it and date the change.
18+. Gambling can be addictive. Nothing on this page makes any slot cheap, because the best return in the table above still keeps more than three euros of every hundred staked and the worst keeps nearly eight. What the page can do is show you which studios let you read the price before you pay it. Decide the stake and the number of spins before you open the lobby, and treat a withdrawal as the end of the session rather than an interruption of it. If gambling has stopped being entertainment, free and confidential help is available in Slovenia through NIJZ.
