Fairness and RNG Testing

A casino is only worth playing at if the games behave the way they say they do. This page explains how game outcomes are produced, who checks them, what RTP actually means, and what the house edge is.

Last updated: 6 October 2026

Why this matters

Every game on ZABET1 is a promise about probability. A slot promises that its symbols land with certain frequencies. A roulette wheel promises that each number has the same chance. A blackjack shoe promises that the cards are in an unpredictable order. If those promises are not kept, nothing else about the site matters.

We do not build our own games. Games are supplied by licensed studios, and the outcomes are produced inside the studio's own systems, not on our servers. We cannot see a result before you do, and we cannot alter one after it is produced. What we can do is choose suppliers who submit their games for independent testing, monitor how those games behave in practice, and remove anything that does not look right.

Random number generation

Every RNG-driven game — slots, virtual roulette, virtual blackjack, video poker, keno, scratch cards, crash and dice games — produces its outcomes from a random number generator supplied by the game studio.

In practical terms, an RNG is a process that produces numbers with no discoverable pattern and no dependence on what came before. Each spin, each deal and each roll is generated independently. A slot that has not paid for two hundred spins is not "due"; the two hundred and first spin has exactly the same odds as the first. The machine has no memory, no awareness of your balance, and no knowledge of how long you have been playing.

The RNGs used by our suppliers are certified by independent testing laboratories. Those laboratories examine the generator itself, run large-scale statistical tests on its output, review the mathematics of each game, and confirm that what the game pays in practice matches what its paytable says it should pay. Certification is not a one-off: studios re-submit games when the mathematics or the software changes.

Who is allowed to do the testing

This is not left to the operator's judgement. ZABET1 holds gaming licence ALSI-202601056-FI2, issued under The Betting and Gaming Act 2005 (Government Notice No. 007 of 2005) and supervised by Anjouan Licensing Services Inc. (Anjouan Gaming). A condition of that licence is that games must be tested and certified by an independent testing laboratory approved by the regulator. A studio cannot self-certify, and we cannot accept a game on the strength of the studio's own word.

The laboratories recognised by Anjouan Licensing Services Inc. (Anjouan Gaming) for this purpose include iTech Labs, BMM and GLI — long-established independent testing houses used across the regulated gaming industry.

Whose certificate is it?

This is where a lot of casino sites are deliberately vague, so we will be exact. The certificates belong to the game suppliers, not to us. Each studio has its random number generator and its individual titles tested by an approved laboratory, and it holds those certificates in its own name. That is the normal arrangement: the RNG lives inside the supplier's systems, so the supplier is what a laboratory can meaningfully test.

ZABET1 does not hold a testing certificate of its own, and we are not going to put a laboratory's badge in our footer to suggest that it does. We do not build games, so there is nothing of ours for a laboratory to test. A badge on an operator's page is worth checking rather than trusting — look for a certificate number, and look for whose name is actually on it.

If you want to verify a particular game, ask us at [email protected] which studio supplies it and we will tell you. The studio publishes its own certification, and you can check it against the laboratory directly rather than taking our word for any of this.

RTP: what it means and what it does not

RTP stands for Return to Player. It is the share of all money wagered on a game that the game is designed to return as winnings over its full lifetime.

Theoretical RTP

Theoretical RTP is a mathematical property of the game, calculated from its rules, its symbol frequencies and its paytable. A slot with a theoretical RTP of 96% is designed so that, across millions upon millions of spins by everybody who plays it, 96% of the total amount staked comes back out as wins.

This number is not a forecast, an average session result, or a rate at which your balance will decline. It is the limit that the game's actual return converges towards as the number of plays becomes very large — and "very large" here means far more plays than any one person will make in a lifetime.

Actual (observed) RTP

Actual RTP is what a game has really paid out, measured over a period: total wins divided by total stakes. It is measured periodically across all players of that game and compared with the theoretical figure.

Over a short period the two numbers will not match, and that is expected. Over a long period they should converge. A persistent, meaningful gap between a game's observed RTP and its theoretical RTP is exactly the kind of signal that triggers an investigation.

RTP is an aggregate, not a promise to you

This is the part that is most often misunderstood, so it is worth being blunt about it.

• RTP is measured across all players combined, not per player. The 96% is the pooled result of everybody's play. It says nothing about the distribution between individuals.
• RTP says nothing about a single session. A 96% RTP slot can return 0% in an evening's play, or 900%. Both are entirely consistent with a 96% design.
• Short-run variance is enormous, and it is the point. The reason a slot is entertaining is that its results scatter widely around the average. The high-volatility games with the biggest jackpots have the widest scatter of all — long stretches of nothing punctuated by rare large wins.
• A high RTP does not make a game profitable. Any RTP below 100% means the expected result of continued play is a loss. A 97% game loses money more slowly than a 94% game; neither makes money.

The honest summary: RTP tells you how a game is built. It does not tell you what will happen to you tonight.

Typical RTP ranges by category

The table below shows the ranges commonly seen across the industry for each category of game, to give you a sense of how they compare with one another.

Finding the RTP of a specific game

Every game carries its own RTP figure, published by the studio that made it. You can find it without leaving the game:

1. Open the game.
2. Open its menu — usually a burger icon, a gear icon or an i button, depending on the studio.
3. Choose the info, help, rules or paytable panel.
4. The RTP is stated there, normally near the paytable or in a "game rules" section at the end.

Some games ship in more than one RTP configuration, and some studios display both a base RTP and a separate figure for a bonus-buy feature. The panel inside the game reflects the version you are actually playing, which is why it is the figure to trust rather than any number quoted elsewhere, including on this page.

Ongoing monitoring

Certification tells you a game was correct when it was tested. Monitoring tells you it is still behaving correctly now.

Game performance is reviewed on an ongoing basis. Observed payout ratios are compared against each title's theoretical RTP, and we watch for the kinds of anomalies that suggest something is wrong rather than merely unusual: a return that drifts and stays away from its expected value, a distribution of results that does not look like the game's stated volatility, repeated identical outcomes, rounds that fail to complete, or a mismatch between what a game reports and what our own wallet recorded.

Where something looks wrong, the game is pulled from the lobby while it is investigated with the studio, rather than left running. If rounds were affected, they are reviewed individually and player balances corrected. A game returns to the lobby only once the cause has been identified and fixed.

Independent audit

Separately from game testing, our anti-money-laundering controls are audited every year by an independent auditor, as a condition of our licence. That audit is not about whether a slot pays what it says it pays — it is about whether the checks around your account, your identity and the movement of money are being run properly. The two together are what "supervised" actually means: the games are certified before they go live, and the operation around them is examined on a yearly cycle by somebody who does not work for us.

Live dealer games

Live dealer tables are not RNG games. The outcome comes from a physical wheel, a physical shoe of cards or a physical dice shaker, operated by a person in a studio and streamed to you.

Those studios run under controlled conditions:

• Dealers are trained and supervised, and the floor is overseen by pit staff who are not the dealers.
• Every table is covered by multiple cameras, and sessions are recorded and retained, so a disputed round can be reviewed against video rather than argued about.
• Card shoes, wheels and shakers are inspected on a schedule, and cards are changed regularly.
• Optical recognition reads the physical result and publishes it to the game, with human confirmation as a check — the result is read from the table, never generated.
• Where a round is misdealt, interrupted or cannot be completed correctly, it is voided and stakes are returned under the table's own rules.

The same statistical checks used on RNG games are applied to live tables. A physical roulette wheel should produce each number at the same long-run frequency; a wheel whose results drift away from that is a wheel with a mechanical bias, and it is taken out of service.

House edge

It is worth stating plainly, because vagueness on this point does nobody any favours.

The house edge is how this site makes money. It is the mirror image of RTP: a game with a 96% RTP has a 4% house edge, meaning that across all play on that game, 4% of everything staked is retained. That is the business. There is no version of an online casino where this is not true, and any site suggesting otherwise is not being straight with you.

What we owe you is that the edge is honest and disclosed, and not hidden. It is built into the published rules of each game and reflected in the RTP shown inside that game, where you can read it before you stake anything. We do not adjust it based on who is playing, how much you have won, or how long you have been on the site.

No strategy overcomes the house edge in the long run. Betting systems — doubling after a loss, chasing a "cold" number, waiting for a machine that is "due" — change the shape of your results, not their expected value. A martingale converts many small wins into one very large loss; it does not turn a negative expectation into a positive one. Correct play in a skill-influenced game such as blackjack or video poker reduces the edge to its stated minimum, which is the best anyone can do; it does not remove it.

Play because the game is entertaining, and stake only what you are content to lose. That is the only approach that survives contact with the mathematics.

Reporting a concern

If a game behaves in a way you believe is wrong — a round that did not settle, a result that does not match what the game showed you, a balance that does not add up — report it. Give us the game name, the approximate time and, if you have it, the round ID shown in the game's history panel. We can pull the round record from the studio and check it against our own logs.

Report a game issue

Related pages

• Betting rules
• Crypto transaction fees
• Responsible gambling
• Terms and conditions
• Support