How do online casinos prevent their games from being manipulated or rigged?

Game integrity in online casinos rests on a layered system — technology, independent testing, and regulatory oversight all working together. Understanding each layer helps explain why a licensed Ontario site is genuinely different from an unregulated one.

The RNG: why outcomes can't be predicted or manipulated

Every game result on a regulated platform is produced by a Random Number Generator (RNG). The AGCO's technical standards set precise requirements for how these must behave. All software-based RNGs must be cryptographically strong, meaning that given an initial state or a sequence of past values, it must be computationally impossible to predict or estimate future values. They also have to draw on external sources of entropy — real-world unpredictability — to constantly refresh their internal state.

Equally important is what the RNG is not allowed to do. The RNG result must be the only input used to determine a game outcome, and no other routines may exist that modify the outcome or bypass the RNG result in exchange for something else. That prohibition closes off the classic "rigging" scenario where a hidden routine overrides results based on bet size, player history, or anything else. The RNG output must not exhibit detectable patterns or correlation with any previous output, and the outcome must not be dependent upon the amount wagered or the style or method of play.

Independent testing before a game goes live

Operators can't simply self-certify. All igaming games, random number generators, and components of igaming systems that accept, process, determine outcome of, display, and log details about player bets must either be approved by the Registrar or certified by an independent testing laboratory registered by the Registrar, prior to being provided for any gaming site.

An ITL certification is a form of written assurance issued by registered independent test laboratories to indicate that they have tested and confirmed that the technology meets the relevant AGCO Registrar's Standards for Internet Gaming. Technologies covered by this policy cannot be deployed in the Ontario market without an ITL certification. The AGCO publishes a list of the labs it accepts; four Independent Testing Laboratories are registered to test and certify key components of igaming systems such as games and random number generators — BMM North America, eCOGRA, Gaming Associates Europe, and Gaming Laboratories International.

The testing itself is rigorous. Statistical analysis of data sets with millions of data points verifies the randomness of both hardware and software RNGs, while emulation testing interrupts computer programs during game play to force specific game outcomes and verify the accuracy of all game rules and prize payouts.

And certification isn't a one-time stamp. Technologies must be recertified by a registered ITL when subsequent modifications are made that render the previous certification no longer valid, including modifications related to game integrity, fairness, and security.

Ongoing monitoring once games are live

Certification before launch is only part of the picture. Once a site is operating, the rules require continuous vigilance. Monitoring and testing shall be performed throughout the life of the gaming system and gaming supplies to ensure they are operating as approved. Operators must monitor the payback of their live games to detect any behaviour that may indicate faulty performance.

If something looks wrong, the response has to be immediate. Where there are suspected game or system faults that may impact game integrity or fairness, operators must make the game unavailable to players until the issue has been resolved. The Registrar must also be immediately notified where there is any problem with the integrity or security of the gaming system or gaming supplies.

How to confirm you're on a regulated Ontario site

All of this protection only applies to operators registered in Ontario's regulated market, managed by iGaming Ontario and overseen by the AGCO. A quick way to verify you're in the right place: regulated sites display both the iGaming Ontario logo and the BetGuard logo. If those aren't visible, the site isn't operating under Ontario's framework and none of these technical safeguards are guaranteed to apply.

The full list of registered operators is maintained at the official iGaming Ontario registry — worth a quick check if you're unsure about a site. Gambling is 19+ in Ontario, and if you ever want support, ConnexOntario is available at 1-866-531-2600.