Random number generators, or RNGs, are widely used in the development of virtual casino games and are also favored in many live dealer titles. But are they capable of making a game truly fair? Could they be rigged by casinos, and is there a way to beat RNG roulette? This article discusses the importance of RNG technology and explains why it is applied in almost all virtual casino games.
What Is a Random Number Generator?
As the name implies, the Random Number Generator (RNG) is a complex algorithm that generates random numbers. It is incorporated into nearly every video game that requires randomness in some form. Various hardware and software RNGs exist, and they are used in cryptography, computer simulations, statistical sampling, and more.
True RNG
To illustrate why randomness is essential for a fair result, consider rolling a die or flipping a coin. Because the outcome cannot be predicted, these actions are regarded as truly random and fair. True RNG systems rely on a mechanical device or physical phenomenon to guarantee unpredictability. Although they are preferred whenever possible, they are more complex and less common because of their physical nature.
Psuedo RNG
The most widely used systems today are pseudorandom number generators. They produce results that appear random but are in fact deterministic. Unlike a true RNG, a pseudo RNG uses a computational algorithm to create long sequences of seemingly random numbers that stem from a much shorter initial key known as the seed value.
When the seed value is known, the entire sequence can be reproduced. Therefore, a pseudo RNG cannot be considered truly random. Even so, it provides enough randomness and unpredictability to support critical applications such as modern computer encryption for security purposes.
RNG Manipulation in Games
Some casino players believe that because an RNG (specifically a pseudo RNG) is a mathematical algorithm, casinos can manipulate it to gain an unfair advantage over patrons. However, we should remember that the house always has the advantage when it comes to gambling. For example, the theoretical house edge in roulette is 2.70% for European rules and 5.26% for American rules.
These figures show that casinos do not need to manipulate the RNG to secure their income, as the rules and payouts already ensure profit over time, even if some players get lucky. The built-in house edge gives gambling establishments a long-term advantage over their patrons. This is why reputable, licensed online casinos use independently tested RNGs, allowing players to rest assured that the games are completely fair.
Some gamblers think they can manipulate the RNG to guarantee profits, but that is impossible unless they have access to the game’s code. Others believe that by observing a particular roulette algorithm, they can spot a pattern and predict future outcomes. This is also a misconception: guessing the seed value for the number sequences is impossible without monitoring millions of hours of play, which is unrealistic.
How and Why Do Casinos Apply RNG to Online Roulette?
1Mechanism of RNG Roulette
In virtual roulette, the wheel and table are merely computer-generated images designed to replicate a real casino environment. The RNG algorithm, however, determines which number will win, and the spinning wheel is simply a pleasant animation that has nothing to do with the outcome.
In fact, the RNG constantly produces numbers while the player is placing bets, adjusting the bet size, and so on. The algorithm runs even when no one is playing. Once the Spin button is pressed, the RNG instantly generates the winning number, and the wheel animation is triggered. The number appears on the screen after the wheel stops moving, creating an authentic look for the game.
Many live dealer roulette games also use RNG systems to determine the winning numbers. Instead of relying on mechanical wheels, which are prone to wear and tear, live casino software providers switch to automated, RNG-based wheels. The game may still be hosted by a croupier who, rather than spinning the wheel and tossing the ball, is responsible only for announcing the winning numbers and confirming the winning bets.
2The Concept of Randomness
There are various misconceptions regarding the results produced by RNG roulette. Some players struggle to understand the concept of randomness in these games because they rely on software-based pseudo RNG. For instance, it is sometimes believed that the computer repeats winning numbers over a certain period of time, so the number 7 will appear at least once in 50–100 spins, or that 7 is “due” to win after a specific number of spins.
Another misconception is that the gaming software repeats a sequence of numbers, so if we see 5, 13, 7, 28, 6, and 31, we might expect the same sequence to reappear later. The idea of hot and cold numbers is even more popular among players, with hot numbers being those that come up frequently and cold numbers those that have not appeared for a while.
In reality, RNG-based games do not produce predictable patterns or repeating sequences of numbers. If players notice certain numbers appearing in any order, it is pure coincidence. Each of the 37 numbers on a single-zero roulette wheel is equally likely to be hit on every spin and has a probability of exactly 1/37 or 0.02702702702. Therefore, the number 7 might be hit 10 times in a row, or it might not appear even after 100 spins of the wheel.
Benefits of Playing RNG Roulette
Today, online casinos feature a vast selection of games, and most of them, including some live-dealer tables, rely on RNGs. Random number generators are essential for creating a gaming experience that mirrors the real thing as closely as possible. Although this software does not produce “true” randomness, it ensures that the game is fair and that results are never rigged or manipulated.
Fair Gaming
Today, RNGs are widely used in online games as well as in slot machines, video poker, and other automated physical casino games. A few decades ago, this was not the case. For example, some slot machines were calibrated to award the jackpot once every three or six months. Other systems were designed so that jackpot amounts could be hit only after a specific number of rounds had been played.
Most gaming machines and online games now run on RNGs, which guarantee complete fairness. While older payout systems could be exploited by casino staff or players, modern RNG-based software is regularly audited by independent third-party companies. Reputable online casinos use RNGs that have been certified and validated through thousands of simulations.
The Convenience of Virtual Games
Another advantage of RNG roulette over live roulette is the convenience and wide selection of virtual variants. Some live tables do use RNG-controlled wheels, but most rely on mechanical wheels, real casino settings (or TV studios), and human dealers. Live games therefore come with certain limitations.
For example, players cannot set the pace of play and usually have only about 30 seconds to select numbers and place bets. Features like Quick Spin or Autoplay are unavailable, and the casino controls the flow. In fully virtual RNG games, players can customize many aspects of play, such as changing table colors and layouts, showing or skipping wheel animations, enabling Turbo Mode or Autoplay, and more.
The range of RNG roulette titles is also much broader than that of live versions. Because these games are virtual, developers can create innovative twists on the classic format, including Double Ball Roulette, Mini Roulette, and Multi-Wheel Roulette. RNG games often provide wider betting limits and, in many cases, more generous rules.
Can You Beat RNG Roulette?
Many people have tried to prove that random number generators are flawed and vulnerable to manipulation. Numerous websites, roulette guides, and books promise to teach you how to beat the RNG. In addition, some computer programs and bots collect vast amounts of data from thousands of rounds. This data is then analyzed in search of patterns, flaws, or sequences of numbers that could be used to make predictions.
All this may sound appealing to players determined to beat casinos at their own game, but it is unrealistic. Because an RNG relies on an algorithm and a seed value, it is impossible to identify any pattern. The results it produces are effectively random and practically unpredictable.
The best way to play RNG roulette is simply to know the rules and to apply an effective strategy, such as making only even-money bets and avoiding wagers with very low odds of success. Money management is just as important: players should always adjust the size of their bets according to their bankroll and risk tolerance. Overall, they should enjoy virtual, RNG-based roulette games the same way they would enjoy a real-life game in a land-based casino.
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Find the answers of questions people asked so far:
I have seen some new generation of roulette games online, which claim to use RNG but they seem to be hosted by real dealers. How does this concept work?
Yes. In the last few years, a new type of RNG roulette and other casino games has started appearing in casinos that use Real Dealer Studios’ software solutions. While the provider’s games may look like the live-dealer options you have already seen, they actually rely on RNG to determine the result of each spin. The studio hires actors, actresses, and even celebrities to pre-record every possible outcome. As with any other virtual roulette game, Real Dealer Studios’ roulette uses RNG to decide the outcome of every round. The only difference is that, instead of seeing animations on the screen, you see the prerecorded scene that corresponds to the result on the wheel.
Thanks to these games, you enjoy a highly authentic casino experience because you still see real dealers and even celebrities playing alongside you. The difference is that results are determined by RNG software, and the game is not streamed live from a dedicated studio.
Is RNG also used when a progressive jackpot is won on virtual roulette games offering progressive prizes?
Yes. Progressive jackpot prizes that can be won on certain roulette variations are truly random because no one can predict the exact moment they will drop. The casino is also unaware of the winning point, as it does not manage the jackpot component of these games. Each roulette game with a progressive jackpot uses RNG technology to set a specific amount that will trigger the jackpot once it is reached.
If the RNG determines an upper jackpot limit, it must be higher than the base amount (seed) of the jackpot. Once players start wagering, their bets gradually contribute to the growing jackpot. When a bet pushes the jackpot total to the limit set by the RNG, the jackpot drops and the entire amount is awarded to the player whose wager triggered the win.