JL59 Fair Gaming: Who Tests the RNG and the Published Return
Fair gaming for a slot means each outcome comes from a tested random number generator and the published return matches the game's maths.
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Fair gaming has a narrow, checkable meaning for a slot: the outcome of each spin is drawn by a random number generator that has been tested, and the return the game advertises is the return its maths delivers. It does not mean you will win, and it does not mean a site is genuine. This page lists who tests what, which labs the studios name, and where to read the figures, as one part of the check website legit routine.
Fair gaming: the three things it covers
Think of fair gaming as three separate questions, each with a different owner.
- Is each outcome unpredictable and free of bias? The random number generator answers this, and labs test it.
- Is the return what the studio says? The studio sets the game’s RTP and publishes it where it chooses to.
- Is the site the one it claims to be? That is a different check, answered by the regulator’s lists, as the PAGCOR legit online casino list steps show.
A lab test speaks to the first question and sometimes the second. It says nothing about the third.
Who tests the random number generator
Gaming Laboratories International (GLI) states on its own RNG page that a random number generator must be tested to ensure non-predictability and that no biases exist towards certain game outcomes. It lists what a review typically includes.
| Test element | What it looks at |
|---|---|
| Source code review | How the generator is written |
| RNG period | How long before the sequence repeats |
| RNG range | The span of numbers it can produce |
| Seeding and re-seeding | How the starting value is chosen and refreshed |
| Background cycling | What the generator does between draws |
| DIEHARD battery | A set of statistical randomness tests |
| Outcome distribution tests | Whether results spread as the maths says |
GLI’s glossary adds that a pseudo-random generator follows a formula from a starting seed, and GLI says its testing began with its inception in 1989. BMM Testlabs says on its site that it has served the gaming industry for over 40 years.
Studios and the labs and records they list
This site’s studio data records the labs each studio names. For definitions, the RTP meaning explained page and the house edge meaning in numbers page show how the return and the edge relate: a 96% RTP means a 4% house edge.
| Studio | Labs recorded | RTP published | Other record in the data |
|---|---|---|---|
| JILI | GLI, BMM Testlabs | No | PAGCOR game-content approval, which is not an operator licence |
| Pragmatic Play | GLI, Gaming Associates, Quinel | One figure per title | A Malta Gaming Authority B2B supplier licence |
| PG Soft | BMM Testlabs, Gaming Associates | In its published game data | A Malta Gaming Authority B2B supplier licence |
| FA CHAI | GLI, BMM Testlabs, Gaming Associates | On its games listing | PAGCOR game-content list |
| CQ9 | GLI | No | PAGCOR game-content list |
JILI publishes no RTP, so no figure appears on this site for its titles. The full row for each studio sits in the game providers directory.
One game, several RTP versions
A published return can describe one version of a game. This site’s game data records Pragmatic Play titles that ship in more than one operator-selectable configuration.
| Game | Published RTP | Configurations in the data |
|---|---|---|
| Gates of Olympus | 96.50% | 96.50%, 95.51%, 94.50% |
| Sweet Bonanza 1000 | 96.53% | 96.53%, 95.52%, 94.51% |
| Mahjong Ways 2 (PG Soft) | 96.95% | One figure, from PG Soft’s own game data |
So when you compare an RTP between two sites, read the game’s info screen on each. Two sites can show different versions of the same title.
Provably fair: a different promise
Provably fair is a term used by some games that let the player check each result with a cryptographic record after the round. The check is done by the player, rather than by a lab before the game is released. Lab-tested slots make a different promise: a laboratory examined the generator in advance.
For example, a game that offers a seed and a hash after each round lets you recompute the result yourself, while a lab-tested slot gives you a studio name and a lab name to look up. Compare the two side by side.
| Provably fair | Lab-tested | |
|---|---|---|
| Who checks | You, after each round | A laboratory, before release |
| What you need | The round’s record and a way to recompute it | The studio and lab names |
Neither promise covers the site. A game can be provably fair on a page that is a copy of a real one, which is why the address and list checks come first. The phishing example gallery shows how convincing a copy can look.
How to check fairness yourself
- Open the game’s info screen and read the stated RTP.
- Find the studio on the providers page and read which labs it names.
- Search the lab’s own site for the studio.
- Compare the RTP with the studio’s own page, and note whether the studio publishes one at all.
- Treat any chat promise of guaranteed wins as a red flag.
FAQ
What does fair gaming mean for a slot?
It means results come from a random number generator with no predictable pattern or bias, and that the game's return is the one built into its maths. Labs test the first part and the studio's published figure describes the second.
Who tests a slot's random number generator?
Independent test laboratories. GLI says its RNG review covers source code, the generator's period and range, seeding and outcome distribution tests, and BMM Testlabs describes itself as a private gaming test laboratory.
Does a published RTP guarantee what I will win?
No. A return to player is a long-run percentage across a very large number of spins, and short sessions scatter widely around it.
Is provably fair the same as lab-tested?
No. They are different promises, covered in the provably fair section below.