RNG in Casinos: UK Gambling Commission RNG Regulations

The UK Gambling Commission (UKGC) regulates gambling operators and software used for licensed online casino gambling in Great Britain. Its Remote Gambling and Software Technical Standards (RTS) set requirements for the technology behind gambling products.

RNG regulation is mainly covered by RTS 7 – Generation of Random Outcomes. The requirement applies to gaming, bingo, lotteries and betting on virtual events. Its main aim is to ensure that games and other virtual events operate fairly.

For an online casino like Genting Casino, this means RNG systems must meet defined technical standards before games can be offered to customers. Regulation also covers how those systems are tested and what happens when important software changes are made. Learn more through the following points:

• What Does the UKGC Require From RNGs?
• How Do the UKGC Test RNGs?
• When Must RNGs Be Tested?
• What Happens When RNG Software Changes?
• How Does the UKGC Approach Fairness?

What Does the UKGC Require From RNGs?

The central requirement is that RNG outputs and game results must be “acceptably random”.

The UKGC says this must be demonstrated to a high degree of confidence. Statistical analysis using generally accepted tests and methods can be used to assess whether RNG outputs are random.

RNG results must also be unpredictable. Importantly, adaptive behaviour is not permitted. This means an operator or software system cannot automatically or manually change the probability of outcomes during play.

UKGC requirement	What it means
Acceptably random	RNG output must demonstrate randomness through appropriate testing
Unpredictable	Future outcomes should not be reliably predicted
No adaptive behaviour	Probabilities cannot be changed during play to influence outcomes
Fair implementation	Games must operate according to their stated rules
Testing	RNGs and relevant games must undergo appropriate technical assessment

These requirements apply to the technology itself. They do not mean that an RNG can predict which individual outcome will occur.

How Does the UKGC Test RNGs?

The UKGC's testing strategy sets out how technical compliance should be assessed.

For RNG testing, an approved test house reviews documentation to understand how the RNG has been implemented. It can also investigate the algorithm or hardware for publicly known weaknesses and vulnerabilities.

Testing can include:

• Reviewing RNG documentation
• Reviewing relevant source code
• Checking for known vulnerabilities
• Statistically testing raw RNG output
• Testing scaled or shuffled data where relevant
• Re-evaluating identified problems after they have been corrected

The UKGC therefore does not rely on a single statistical check. Its testing framework considers documentation, implementation, vulnerabilities and statistical performance.

When Must RNGs Be Tested?

Testing takes place before relevant products, such as online slot games, are released.

The UKGC states that new games and RNGs must have satisfactory testing completed and the relevant test report provided to the Commission before release. This external testing primarily applies to the fairness elements of RNG-driven products.

Testing is not necessarily limited to the initial launch. The Commission also has requirements for updates to existing games and systems.

An update that could affect game fairness may require external retesting. Changes that do not affect fairness may be treated as minor updates, provided the operator follows the required internal controls and documentation processes.

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What Happens When RNG Software Changes?

Changes to an RNG or remote gaming system can affect multiple games. As a result, the UKGC's testing strategy requires appropriate assessment when changes could affect functionality or fairness.

If an updated RNG supports many games, a representative sample may need to be retested. The sample should cover different game types and generations rather than being limited to similar products. Testing should be completed before the updated RNG or gaming platform is launched.

Operators are also expected to maintain change-control documentation. This can include identifying the change, the RNG or game affected, whether the change is major or minor, the testing performed and the relevant authorisation.

How Does the UKGC Approach Fairness? 

The UK's approach is based on technical standards and risk-based testing rather than simply relying on a provider's reputation.

The UKGC describes its testing strategy as outcome-based and risk-based. It considers the likelihood and impact of non-compliance, as well as suitable ways of assessing compliance.

This approach also recognises that technology can change. Testing requirements can therefore apply to new products, significant software changes and changes to the systems supporting games.

The same broad focus on fair operation applies across gambling products, although a live casino using physical equipment has different technical considerations from an RNG-driven game.

Genting Casino Tip: When reading about RNG fairness, focus on the testing process rather than claims about being able to predict results. UKGC testing examines whether an RNG meets defined technical requirements. It is not designed to identify a strategy that can forecast individual outcomes.

Why RNG Regulation Matters

UKGC RNG regulations provide a technical framework for making sure random outcomes in licensed gambling products are properly generated, tested and maintained.

The core principles are straightforward: outcomes should be acceptably random and unpredictable, adaptive behaviour is not permitted, and relevant RNGs and games must undergo appropriate testing. Independent test houses provide additional assurance where third-party testing is required.

For Genting Casino, these principles form part of the wider regulatory environment in which digital gambling products are operated. Understanding them can help customers see what RNG regulation is designed to achieve: technical fairness and oversight, rather than a method for predicting results.

As gambling technology changes, testing and regulatory requirements can also develop. The UKGC's technical standards and testing strategy therefore remain important reference points for understanding how RNG-powered products are assessed.

Understanding RNG regulation should not be viewed as a way to predict or influence future outcomes. If you choose to use an online casino, keep gambling within limits that are affordable for you. Avoid chasing losses, take breaks and make use of available responsible gambling tools where appropriate. Random outcomes remain random regardless of previous results. No testing certificate, provider name or pattern of past outcomes can guarantee a future result.

FAQs

What is RTS 7?

RTS 7 is the UKGC technical standard covering the generation of random outcomes. It requires RNG and game outcomes to be acceptably random and prohibits adaptive behaviour.

Does the UKGC test every RNG itself?

No. The UKGC sets the requirements and maintains a list of approved test houses that carry out required independent testing on behalf of licensees.

What does RNG testing involve?

Testing can include reviewing RNG documentation and source code, checking for known vulnerabilities and statistically analysing raw RNG output and relevant processed data.

Do RNGs need to be tested after software updates?

Potentially. Changes that can affect game fairness may require external retesting, while minor changes that do not affect fairness can follow defined internal testing and change-control procedures.

Does UKGC approval make RNG outcomes predictable?

No. Regulation and testing are intended to support fairness and unpredictability. They do not provide a method for forecasting individual RNG outcomes.