How do online casinos in Ontario prevent their games from being altered or rigged after they go live?

Game rigging in Ontario's regulated market isn't just unlikely — it's structurally very hard to pull off, and the AGCO's rules make sure the problem can't be quietly buried even if something does go wrong. Here's how the system actually works, layer by layer.

Certification before a single spin goes live

The critical components of an igaming system — games, random number generators, and the systems that accept, process, determine the outcome of, display, and log player bets — all require certification by an independent testing laboratory (ITL) before deployment. These ITLs aren't chosen by the operator; the AGCO registers independent testing labs that test and certify igaming technology against the Registrar's Standards for Internet Gaming. An operator can't simply put a game live and hope for the best — all games offered in Ontario must, prior to deployment, be certified by an AGCO-registered ITL or approved by the Registrar, and must be provided by AGCO-registered suppliers.

The RNG requirements are tight. The RNG result must be the only input used to determine game outcomes, and no other routines may exist that modify the outcome or bypass the RNG result. The RNG output must not exhibit detectable patterns or correlation with any previous output, and the outcome must not be dependent on the amount wagered or the style of play. Game outcomes shall not be altered, discarded, or otherwise manipulated through a secondary decision by the game program. That last point directly addresses the classic rigging scenario — a hidden routine that overrides the RNG after it's already generated a result. The standards explicitly prohibit it.

What happens after a game goes live

This is where Ontario's framework is genuinely different from a lot of offshore markets. Certification at launch isn't the end of the story. Monitoring and testing must be performed throughout the life of the gaming system and gaming supplies to ensure they are operating as approved. Operators are required to monitor the payback of their live games to detect any behaviour that may indicate faulty performance.

Any change to a game after it goes live triggers its own compliance process. Modifications to gaming device control programs that impact the topics covered in the original source code review may require an independent source code review of those modifications, determined by the AGCO on a case-by-case basis. Operators must have both preventative and detective measures in place to ensure that no unauthorized or unintentional changes are made to the gaming system, and there must be a mechanism to validate that installed software is the certified software. In other words, the live version of a game must be verifiably identical to the version that passed testing.

If something does go wrong, the rules are clear: the Registrar must be immediately notified where there is any problem with the integrity or security of the gaming system or gaming supplies. Gaming devices and systems that are discovered to suffer from integrity or security concerns at any time after deployment must be promptly removed from play or have other action taken to mitigate the concern.

Logging, recovery, and enforcement teeth

Continuous logs must be maintained for critical gaming systems, including to track financial accounting and game state history. Mechanisms must be in place to allow a game to be recreated up to and including the last communicated state to the player — meaning disputed rounds can be reconstructed and reviewed. That's a meaningful protection for players.

On the enforcement side, the AGCO doesn't just issue letters. 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. Losing registration means losing access to Ontario players entirely — a serious commercial consequence that gives operators a strong incentive to stay clean.

How to confirm you're on a regulated site

All of this only applies to operators registered in Ontario's regulated market. A quick way to confirm you're on one: look for both the iGaming Ontario logo and the BetGuard logo on the site — per iGaming Ontario, their presence signals the site is managed by iGaming Ontario and regulated by the AGCO. The full current list of registered operators lives at the AGCO's official registry, which is the authoritative source since registrations change over time.

If you ever want support around your play — whether that's setting limits or just talking to someone — ConnexOntario is available at 1-866-531-2600. Ontario's regulated market is open to players 19 and over.