How do I know the games at an Ontario online casino cannot be manipulated after they have been approved?

Approval is just the starting line — what keeps Ontario's online casino games honest is a layered system that runs continuously, not a one-time rubber stamp.

Before a game ever reaches you

All gaming activities and financial transactions must be conducted fairly and honestly, and must be independently verifiable. That principle is the foundation of the AGCO's Registrar's Standards for Internet Gaming, and it has real teeth. Every igaming game, random number generator, and component of an igaming system that accepts, processes, determines the outcome of, displays, or logs 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 offered on any gaming site.

Those independent testing labs (ITLs) are not self-appointed — an ITL certification is written assurance issued by a registered independent test laboratory confirming that the technology meets the relevant AGCO Registrar's Standards for Internet Gaming. ITL certifications for Ontario's igaming market can only be issued by ITLs that are registered by the AGCO. The RNG requirements they test against are specific and demanding: all software-based RNGs must be cryptographically strong, meaning that given an initial state or sequence of past values, it must be computationally impossible to predict or estimate future values. The source code itself is reviewed to confirm that the RNG result must be the only input used to determine the game outcome — no other routines may exist that modify the outcome or bypass the RNG result.

What stops someone from quietly changing a game after approval

This is the sharper part of the question, and the rules address it directly. These same 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must be recertified by a registered ITL when subsequent modifications are made that render the previous certification no longer valid, including modifications related to responsible gaming, game integrity, fairness, and security. So an operator cannot simply push a software update and keep playing — any meaningful change to the game logic resets the clock on certification. Recertification is required when any modification or subsequent discovery of an undetected issue impacts critical gaming system integrity, fairness, or security; the effect of the modification or discovery is to render the previous certification invalid.

Beyond that, ongoing monitoring is built into the standards. Monitoring and testing must be performed throughout the life of the gaming system and gaming supplies to ensure they are operating as approved. The Registrar must be immediately notified where there is any problem with the integrity or security of the gaming system or gaming supplies. And at the platform level, continuous independent monitoring and recording of lottery schemes must be in place to support verification of adherence to required game rules, confirmation of outcomes, prize payment to the proper person, and accuracy of financial transactions.

The AGCO also keeps compliance pressure on operators after launch. The AGCO monitors igaming operators, suppliers, and digital game offerings for compliance with regulatory obligations, including the Registrar's Standards for Internet Gaming. Where compliance concerns are identified, the AGCO can bring operators and suppliers back into compliance through progressive sanctions, including warnings, suspensions, monetary penalties, and in the most serious cases, revocations. Anti-cheating standards go further still: AGCO standards governing anti-cheating measures include the presence of measures to deter, prevent, and detect cheating; to investigate complaints of cheating made by players; and to notify the AGCO's OPP detachment of incidents of cheating for possible criminal investigation.

For Toronto players, the practical check is simple: look for the iGaming Ontario logo wherever you play as a sign that you're playing on a site that is being conducted and managed by iGaming Ontario, offers player protections, and meets Ontario's high standards for game integrity and responsible gambling. Regulated sites also display the BetGuard logo — seeing both is your confirmation the site is operating inside the regulated framework. The full list of registered operators is available directly through the iGaming Ontario registry at igamingontario.ca, which is worth bookmarking as the live source of truth rather than relying on third-party lists.

If gambling ever becomes a concern rather than entertainment, ConnexOntario is available at 1-866-531-2600. Ontario's legal gambling age is 19+.