RNG: the key to randomness in online casinos
What is an RNG?
RNG stands for Random Number Generator. It's an algorithm designed to produce unpredictable sequences with no patterns. In casino games, these algorithms are essential to guarantee fully random and fair results.
Games that use RNG
Card games
Random number generators ensure fair card distribution in every digital card game.
Slots
Each spin is determined by an RNG. When you hit the spin button, the algorithm assigns a combination of symbols independently of the previous spin.
Roulette
In online roulette, the RNG decides the number and color where the ball lands, replacing the physical spin of the traditional wheel.
Exceptions\ Games with a live dealer (live cards, live bingo, etc.) don't use RNG; randomness comes from the dealer's physical action.
Difference between RNG and RTP
| Feature | RNG | RTP | | ---------------- | -------------------------------------------------------------- | -------------------------------------------------------------------------------- | | Function | Guarantees the randomness and fairness of each individual result. | Indicates the theoretical percentage a game returns to players over the long run. | | Timing | Acts at every moment of play. | Calculated after millions of plays. | | Influence | Affects the immediate unpredictability of results. | Adjusts long-term return expectations. |
RTP example
An RTP of 96% means the game will return €96 for every €100 wagered over time, although individual results may vary.
Acceptable RTP ranges
No casino offers an RTP above 100%, since it would mean guaranteed losses. However, there are games with RTPs very close to 100%, minimizing the player's potential long-term loss.
Importance of regulated environments
Certification labs thoroughly verify RNGs and RTP percentages. Playing at regulated casinos guarantees that:
- Transparency and fairness tests have been passed.
- The algorithms keep randomness and don't show bias.
- Player protection regulations are met.
GLI and BMM Testlabs assessments
Audits include source code analysis, verification of the RNG's range and period, and checks on the randomness of initialization events.
Recommended technical requirements for an RNG (BMM Testlabs)
- Thread safety: avoid failures from simultaneous calls.
- Single instance: use a single RNG for all results.
- Scalability without bias: keep fairness as load increases.
- Background updates: allow improvements without interrupting the service.
- Truly random event for seeding: start with an unpredictable source.
Conclusion
The combination of RNG and RTP backs fairness, transparency and security in online casinos. Independent certifications and compliance with technical requirements guarantee a reliable gaming experience for users.
