Certification and Testing of Video Slots: Build Trust in Games

Rosloto experts will discuss casino product licensing, ways to prepare for content verification, and which laboratories to contact.

Testing of Entertainment Solutions

This is an assessment of game releases for compliance with the technical, mathematical, and regulatory requirements of legal markets.

Slots, cards, table products, arcades, fishing options, and other products with a built-in random number generator are subject to verification.

The goal of certification is to prove the fairness, predictability, and safety of the provided solutions for both players and regulators.

Rules for checking land-based machines appeared in the US in the mid-20th century in the state of Nevada.

The local regulator, NGCB, obliged equipment manufacturers to prove that:

• their products operate fairly;
• results cannot be manipulated;
• payouts correspond to the declared parameters.

In 1981, BMM Testlabs opened in Australia. The company was one of the first independent organisations trusted by regulators to test offline slot machines. This was a turning point in the gambling industry, as certification ceased to be a function performed exclusively by the state.

What Is Checked by Accredited Centres

Slot testing is a comprehensive analysis of mathematics, logic, and the transparency of content. Regulators are interested not only in the functionality of games, but also in how they are played in online casinos.

Providers set certification parameters at the level of the engine’s architecture. They do not try to adjust the ready-made solution to meet the requirements of the authorities, but instead initially produce high-quality and secure software.

Random Number Generator

Laboratories analyse the algorithm of the winning combinations’ drop-out, as well as the context of its use in sessions.

Key aspects of RNG testing:

• statistical randomness and uniformity of number distribution;
• absence of a correlation between consecutive results;
• independence of outcomes from time, size of bets, and external factors;
• correct seeding processes;
• impossibility of predicting the following values.

Various approaches are used for verification. These include the run-through of millions of rounds, the conduct of statistical tests, analysis of deviations and anomalies, etc.

Independent experts must ensure that the mathematical model fully complies with the stated logic. The level of RNG protection from outside interference and the impossibility of changing slot parameters without recertification are also assessed.

RTP and Volatility

After confirming the correctness of the random number generator, the laboratories move on to the verification of casino entertainment characteristics.

At this stage, the following aspects are checked:

• compliance of the actual Return To Players percentage with the stated value;
• correctness of RTP calculations in different rotation modes (basic, accelerated, bonus, and automatic);
• stated volatility and the level of the allocation of rewards;
• absence of hidden parameters that affect payouts.

Laboratory staff conduct large-scale game simulations and analyse the distribution of prizes in the long run. The next step is to compare planned indicators with actual results and determine whether there are any deviations from the norm.

Special attention is paid to testing extreme scenarios, such as hitting a jackpot or losing streaks. This is where, according to the statistics, the largest number of errors and failures occur.

Game Logic and Mechanics

Even if the RNG and RTP are functioning correctly, a slot machine may be rejected if its functionality misleads players.

Therefore, the laboratories additionally check:

• conditions of bonus rounds activation;
• rules for calculating and using free spins;
• progressive jackpots;
• correctness of triggers and random events.

Specialists ensure the absence of hidden terms, the correct display of odds and winnings, as well as the similar behaviour of slot machines for all customers.

Any discrepancies between the stated descriptions and the actual results are considered a serious violation. Such inaccuracies lead to the refusal of certification.

Benefits of Slot Testing

Let us consider why it is beneficial for online casino owners to buy proven certified software:

1. Strict regulatory policy. Leading gambling commissions (UKGC, MGA, and SGA) require that all slots use verified RNG and have a confirmed RTP. Without this, operators may receive fines, lose their licence, or be blocked by payment providers.
2. Risk reduction. Testing confirms that games do not manipulate the outcome and correctly handle edge cases. If there are any complaints or regulatory inspections, entrepreneurs can provide official lab reports and confirm the transparency of results.
3. Protection against financial errors. Verification reveals inaccuracies in the calculations of payments, freezes during bonus rounds, inappropriate behaviour when sessions are interrupted, and other issues. Even one critical bug can lead to multi-million dollar losses or massive disputes with clients.

Game certification is also beneficial for software vendors. It allows them to access legal markets, collaborate with major operators, and deliver original content.

The undeniable advantages of testing also include end-to-end quality control of casino entertainment.

Comprehensive assessment includes RNG and result distribution verification, validation of mathematical models, as well as load and stress testing. This ensures that the provider receives a stable and scalable product that can be seamlessly distributed in licensed online casinos.

Who Checks Digital Slots

Let us look at the experience of renowned labs that certify content, RNG, and digital platforms.

Gaming Laboratories International

GLI is the largest accredited centre in the world. The company was founded in 1989 and has been operating in the market for over 35 years.

Key areas of activity include:

• assessment of RNG, casino portals, slot machines, betting systems, and payment systems;
• content certification in accordance with the requirements of more than 480 jurisdictions;
• technical and consulting support.

The enterprise offers not only gambling product testing but also its training programs under the GLI University brand. Furthermore, it advises clients and helps investigate incidents, complaints, and suspicions of violations.

iTech Labs

This is a popular RNG and entertainment system testing centre. Its services are in great demand among online casino owners in Europe, Asia, and Australia.

The company’s main activities include:

• RNG check for unpredictability and statistical randomness;
• evaluation of mathematical models of solutions and their security;
• certification of platforms according to the requirements of selected gambling commissions.

iTech Labs is accredited according to ISO/IEC 17025 and 17020 international standards, confirming its independence and high level of competence.

BMM Testlabs

BMM Testlabs is considered the oldest certification centre, which started working in the early 1980s.

Today, the organisation:

• conducts all types of tests for RNG, slots, table entertainment, VLT terminals, and gambling systems;
• checks both online and offline casino products;
• certifies software according to the requirements of selected regulators.

BMM is present not only in popular gambling markets but also in specific jurisdictions. For example, in April 2025, the laboratory received the exclusive right to test lottery software and terminals for the UAE Lottery in the United Arab Emirates.

eCOGRA

The eCommerce Online Gaming Regulation and Assurance organisation was founded in 2003 in London. It was one of the first labs to start verifying online content.

Today, the enterprise checks the RNG and RTP of casino, lottery, or betting software, and also acts as an independent arbitrator in disputes between entrepreneurs and their customers.

The laboratory frequently conducts periodic and random audits of already certified operators, including:

• control of the declared RTP indicator’s compliance with actual figures;
• audits of changes after platform updates;
• monitoring adherence to fair play standards.

This enhances the credibility of the eCOGRA quality seal since it confirms not only initial compliance but also the long-term integrity of entertainment content.

How to Prepare for Certification

Rosloto experts reveal the secrets of successful slot machine testing.

Careful Preparation of Documents

Laboratories spend a lot of time studying technical specifications rather than reviewing content.

A responsible approach to the preparation of reports and protocols will help reduce the number of additional tests, while inaccuracies in this matter often lead to repeated checks.

The minimum package of documents includes:

• RNG description;
• mathematical model and RTP calculation;
• bonus accrual rules;
• diagram of game states;
• list of edge-case scenarios.

Consideration of Testing Deadlines

With good starting preparation, the minimum timeframe is:

• RNG algorithm — 2–4 weeks;
• slot machine (a game for one jurisdiction) — 4–8 weeks;
• live entertainment and product with complex bonus features — 8–12 weeks.

If proprietary software is distributed to several countries at once, about 1–1.5 more months will be added to the deadlines.

To accelerate the period of considering the application, entrepreneurs should immediately indicate the target jurisdiction, honestly describe the game architecture, and provide access to a test server.

It would also be good to assign a technical specialist to interact with the representatives of the certification authority.

Repeat Testing

Many providers mistakenly believe that verification is only necessary at the stage of content release. In practice, any change can invalidate the current certificate, as it is tied to a specific version of the product and infrastructure.

Key innovations include:

• math and RTP adjustments;
• bonus logic updates;
• server migration;
• RNG provider replacement.

Large software vendors are addressing these tasks systematically. They divide all updates into the main (RNG, payouts, bonuses, server logic) and additional ones (UI, localisation). All changes are approved before the release.

This makes it possible to generate additional reports rather than conduct re-testing.

The Main Things about Casino Content Certification

Slots, table games, arcades, and lotteries are subject to a mandatory verification by independent laboratories.

Key aspects that operators should take into account:

• Accredited centres evaluate mathematical models, bonus and jackpot logic, as well as the fairness and immutability of results. They also test how stated parameters (RTP, volatility) correspond to actual outcomes of sessions.
• A thorough software check is available in GLI, iTech Labs, BMM Testlabs, eCOGRA, and other laboratories. The certification period depends on the type of content, jurisdiction, and bonus system.

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