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Understanding the RNG: fairness at online sweepstakes casinos

Jerard Villena Author Profile Picture

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Jerard V.

Date Post

Jan 18, 2024

A lady in pink dress sitting in front of a slot machine.


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All of the online sweepstakes casinos have many games of chance, compelling players to try their luck and potentially win sizable jackpots. Have you ever wondered how they work? Are the outcomes random, or do casinos rig their online casino games to favor the house edge? Can you count on fair play when enjoying your favorite sweepstakes slots games, roulette, and card games?

Enter RNGs or random number generators. They’re critical for determining unpredictable casino game outcomes. Discover how they work, their benefits, the testing they undergo for certification and regulatory compliance, and the most prevalent myths about them.

What is an RNG?

An RNG is hardware or software that generates sequences of random numbers or symbols to determine game outcomes. Whether you spin the slot reel or roulette wheel, shuffle or deal cards, or roll the dice, it produces unpredictable results, ensuring statistical independence and uniformity.

That means no number or symbol depends on a previous sequence. Each has the same likelihood of appearing and doesn’t impact subsequent games. Here’s why that matters.

The importance of RNGs

RNGs are critical for ensuring fairness and instilling trust in the integrity of online sweepstakes casino games. Generating random numbers and symbols with uniform distribution and statistical independence creates a fair gaming experience.

That means every player has an equal winning or losing chance. They don’t need to worry about a casino manipulating the outcomes to favor the house edge. They can trust game integrity because unpredictability is a critical RNG feature. Here’s how RNGs ensure it.

How RNGs work

Hardware RNGs generate random numbers or symbols using physical processes like atmospheric pressure, thermal noise, or radioactive decay. Since those factors are unpredictable, we refer to these RNGs as TRNGs (True Random Number Generators). However, they’re expensive, and few casinos use them.

Most online casinos use PRNGs (Pseudo-Random Number Generators). They’re software RNGs relying on mathematical algorithms to provide random numbers, each corresponding to a specific outcome (e.g., cards in a deck or a symbol combination in slots). Those algorithms typically need a seed (an initial value like user input or time) as a starting point to ensure unpredictability.

However, don’t let the seed and the “pseudo” part worry you. Reputable casinos use certified, third-party RNGs with dynamic seeding. That means RNG software providers constantly change the parameters to ensure no one can predict game outcomes. Most importantly, RNGs undergo regular testing for randomness, integrity, and fairness.

Testing and certification

Testing and certification are critical to ensure RNGs are random and unbiased. That’s where independent labs come into play. The most notable in online casino gaming include eCOGRA (eCommerce Online Gaming Regulation and Assurance), Technical Systems Testing (TST), iTechLabs, Gaming Associates, Gaming Labs International (GLI), and QUINEL.

Here’s how third-party labs test and certify RNGs:

  • Assessing algorithms and implementation – Regulatory bodies check the source code and entropy for biases and vulnerabilities to verify integrity. They also evaluate the design and see how a particular casino has implemented an RNG to comply with industry standards and regulatory requirements.
  • Performing statistical tests – Sequence, frequency, spectral, diehard, and other tests help detect potential anomalies or patterns. Their absence indicates genuine randomness.
  • Running simulations – Checking how an RNG works in various games under diverse conditions is crucial for determining if it provides fair, unbiased results.
  • Testing in a real-world environment – Once an RNG passes all tests and shows favorable simulation performance, it’s ready for real-world checks and subsequent implementation.

The best part about RNGs in online casinos (including sweepstakes platforms) is that independent labs perform regular audits. They don’t merely give the green light and forget about certified RNGs. They reassess them for potential anomalies or modifications to prevent dishonest practices, ensuring casinos don’t affect randomness, fairness, and integrity.

Common myths and misconceptions

Many casino players don’t understand how RNGs work, causing them to make poor decisions like chasing losses because they think they can predict game outcomes. It’s time to dispel myths about RNGs, don’t you think? Here are the most prevalent:

  • Online casinos can rig RNGs – The whole point of RNGs is to prevent casinos from rigging games. Certified RNGs are fair and unbiased, providing absolute game integrity. No one can manipulate the results. Reputable casinos don’t want to impact the outcomes because they would lose the RNG certificate and mar their reputation.
  • RNGs have hot and cold cycles – This misconception typically concerns slots and might have roots in Hollywood movies. You know those scenes when someone plays for hours without a payout, and a keen observer waits for the opportunity to sit at the same slot machine because they believe a jackpot is imminent? The reality paints a different picture because RNGs rely on uniformity and independence when producing number or symbol sequences.
  • RNGs are predictable – No one can predict game outcomes. It’s right there in the name; RNGs are random. Knowing the seed in PRNGs would theoretically enable you to predict the results, but dynamic seeding and encryption make it impossible.

Instead of wasting time fruitlessly predicting the results or pondering your chosen casino’s possibility of rigging games, you might want to focus on a strategy. Gamble responsibly, and don’t let myths ruin your gaming experience.

FAQs about RNGs

Many jurisdictions require online sweepstakes casinos to meet specific regulatory requirements. Independent testing and regular audits are some of them. Others may include displaying a third-party RNG certificate on the website for transparency and conducting peer reviews regarding algorithm design and implementation.

Third-party labs regularly test RNGs for fairness and randomness, conducting statistical tests and checking RNGs in simulated and real-world environments. They assess entropy sources, the source code, algorithm design, RNG implementation, and other parameters to ensure every outcome is independent and follows uniformity.

Reliable casinos display RNG information on their website, including the certificate status and the independent lab that provided it. While at it, check for a valid casino license, ensuring it comes from a reputable body like the Malta Gaming Authority (MGA) or the UK Gambling Commission (UKGC). Authentic user reviews can also speak volumes about your desired casino.


All of the online sweepstakes casinos use certified RNGs to ensure fairness, unpredictable outcomes, and game integrity. They create an equitable gaming environment, helping players enjoy their favorite casino games knowing they’re unbiased and can drop a jackpot anytime. They enable you to focus on gameplay and gamble responsibly.


Jerard Villena Author Profile Picture

The Author

Jerard Villena Author Profile Picture

Jerard V.

Content Writer

the author

Meet Jerard, an experienced content creator, and an all-things tech guy. He's here to help guide you through the landscape of sweepstakes casinos, one review at a time. Jerard’s passion for producing high-quality content that’s useful to the readers is always his top priority. Being a lifelong gamer has given him the skill to quickly distinguish what games in a casino's library are good or bad, to ultimately give you the best recommendations. Aside from work, Jerard loves traveling around his home country, the Philippines. A country composed of thousands of islands and with a very diverse culture where there’s always something new to learn or explore.

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