RNG (Random Number Generator)

Casino RNGs are pseudo-random: deterministic algorithms (commonly variants of Mersenne Twister or cryptographically secure generators) seeded from a high-entropy source such as hardware noise or system events. They produce long streams of numbers that pass statistical tests for uniformity and independence. The game maps each number onto an outcome using its reel strips or card deck.

The RNG runs on the studio's game server, never in the player's browser, so the client cannot influence it. Outcomes are generated per request and are not affected by previous results, timing or bet size — the "hot" or "due" machine is a myth in an RNG game. Certification labs such as GLI, iTech Labs, BMM and eCOGRA test the generator's statistical properties, its seeding, its scaling into game outcomes and the implementation in each game, and issue certificates per jurisdiction that regulators recognise.

For operators, a certified RNG is a licence condition. Every game in the lobby needs a valid certificate for each market it is offered in, and platform or aggregation providers are usually responsible for tracking them. A certification lapse or an uncertified variant is a compliance breach.

For studios, RNG certification is a fixed cost of entering each regulated market and one of the reasons new jurisdictions take months to open. It is also a trust signal in marketing: certificate numbers and lab logos appear in game rules for a reason.

A studio launching a new slot in Ontario, Sweden and Malta submits the game and its RNG implementation to a lab. The lab confirms the generator's output over billions of draws matches the expected distribution, that the outcome mapping yields the certified RTP, and that the seeding cannot be reproduced. Three jurisdiction-specific certificates follow, each referenced in the game's info screen and in the aggregator's compliance database.

• Provably Fair — a cryptographic alternative to lab certification used in crypto casinos.
• Live Dealer — games where physical equipment replaces the RNG.
• RTP (Return to Player) — realised through the RNG's outcome mapping.
• Aggregator — tracks RNG certificates per game and jurisdiction.

Find testing and certification providers in the Security category and studios in the Game Development category.