How Algorithms Work in Online Slots

Slots are one of the most popular forms of entertainment in online and land-based casinos.

Colourful, dynamic and addictive – these are their main features. But have you ever wondered what really makes them work? The answer lies in the algorithms that control each round. In this article, we break down the topic into its constituent parts and show you how slot machines really work.

Key slot game statistics

There are some important slot game statistics that can accurately express the nature of a game and its potential. Software companies configure individual values for each title themselves so that the overall game offers a specific return and opportunities for players.

For those curious to test these mechanics without spending money upfront, the Stay Casino sign up bonus offers a great opportunity. It allows players to explore how features like RTP, volatility, and bonus rounds function in real games — all without risking their own cash.

RNG as the heart of every slot

The basis of every slot game is the RNG, or Random Number Generator. It decides where the symbols will stop, what the combinations will be, and whether you will hit free spins or the jackpot.

RNG is not some predictable algorithm. It is a complex system based on mathematics and probability that generates numbers in fractions of a second – even when you are not playing. Each spin is therefore completely independent of the previous one.

The RNG has no memory and cannot be cheated. It doesn’t care that you haven’t won in 20 spins. It doesn’t increase your chances after a series of losses. Each spin is a new draw. That’s why playing slots is pure chance, not strategy.

RTP – return to player in percent

Another key thing is RTP – Return To Player, i.e. the return to the player. It is expressed as a percentage, e.g. 96%. This means that on average, 96% of the money paid in will be returned to players over a longer period of time.

This is a statistical value calculated based on millions of spins. The RTP is set by the game manufacturer and approved by independent gambling testing laboratories. It does not guarantee a win and is for illustrative purposes only.

Software volatility

Volatility is another parameter that is worth knowing. It indicates how often and how large the potential winnings are.

• Low volatility – frequent but smaller winnings
• Medium volatility – a balance between the frequency and size of winnings.
• High volatility – wins are rare but can be very large.

When playing a high volatility slot, you may not win anything for a long time, but then suddenly win x1000 your stake. It’s the excitement that attracts players, but it also means greater risk.

Bonuses, Wilds and Scatters – are they random?

All bonus symbols, wilds, scatters, respins, etc. are also controlled by the RNG. This means that it is impossible to ‘cheat the system’ by clicking at a specific moment. The RNG decides when something is activated.

Some slots have a so-called simulated progression, i.e. visual effects that give you the impression that you have almost won. This works psychologically, but the maths is still relentless – the result was determined the moment you clicked the SPIN button.

Fairness of games of chance in online casinos

It depends on where you play. Legal casinos use licensed software that has been audited by eCOGRA, iTech Labs or GLI, for example. These are independent institutions that check the RNG, RTP and security of the game.

If you play at unlicensed casinos on unknown platforms, there is a risk that the slot has been rigged. That’s why it’s always a good idea to check whether a slot comes from a reputable provider (e.g. NetEnt, Play’n GO, Pragmatic Play) and whether the casino is licensed.

Examples of games and their statistics

For those who like hard data, it is worth taking a look at examples of popular slots and their RTP.

• Starburst (NetEnt) – is a cult classic with a simple 5×3 layout and expanding wilds. Great for beginners with a Return To Player of 96.09%.
• Book of Dead (Play’n GO) – a popular slot with a free spins feature and expanding symbols, with an RTP of 96.21%.
• Sweet Bonanza (Pragmatic Play) – a dynamic slot with cascading wins and a bonus purchase option, with an RTP of 96.51%.
• Dead or Alive 2 (NetEnt) – extremely high volatility with an RTP of 96.82%. A slot for players with nerves of steel – potential big wins, but rarely.

You can often find more information in the game description at the casino or on the manufacturer’s website.

Is there a strategy to beat the randomness of slots?

There are groups online that claim to offer strategies or guide you to which machines are particularly profitable today. We are not particularly convinced of the reliability of such recommendations.

In roulette, you can try systems such as Martingale, but in slots there is no such thing as predictability. Each spin is independent, the RNG does its job, and you have no influence on the outcome.

Some people also use the stop spin and fast play features, which stop the reels faster. However, this is considered to be just a visual effect – the RNG has already decided the outcome of the spins long before.

Example – how does the draw work in practice?

Are you interested in how the results are drawn in a slot game? We have prepared a small simulation.

1. You click ‘Spin’.
2. The RNG generates a random number, e.g. 457128.
3. This number is assigned to a specific symbol combination (predefined in a table).
4. The game displays the symbols corresponding to this combination.
5. If the combination is a winner, congratulations, you have won a prize.

When it comes to reliable software, the result of the draw will always be random.

What algorithms do game providers use?

Some manufacturers create their own solutions, while others use ready-made RNG libraries. Examples:

• NetEnt – proprietary systems tested in Sweden.
• Pragmatic Play – MGA and UKGC compliance, external audits.
• Play’n GO – internal mathematics department + external certifications.

Each of these providers must prove that their RNG meets gambling standards and cannot be manipulated.

Slot games and their results are mathematics

Slot games are the result of a combination of mathematics, statistics and technology. They operate completely randomly, are based on RNG, and have a predetermined RTP and volatility. Everything you see on the screen is the result of an algorithm – not your intuition, luck or playing time.

That’s why it’s important to approach slots with a relaxed attitude and awareness – they are entertainment, not a way to make money. And knowing how it all works allows you to play smarter and without illusions.

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