What Makes a Slot Game Go Viral? The Design Patterns Behind the World's Most-Played Online Games

Within the online casino space, there are thousands of slot games competing for player attention and new releases are emerging all the time. Yet, a relatively small number of these games actually captivate players, keep them coming back, become viral hits, and break into a list of the most-played online games in the world.

The heavyweights of the genre, like Gates of Olympus, Sugar Rush, and Tome of Life, have become hugely popular and while some will attribute this to a combination of effective marketing, the power of the brands behind the games, or even blind luck, in reality, their success is driven by very deliberate design choices.

In this article, we'll examine the design philosophy behind these viral hits and explore how visual feedback, reward structures, novelty features, UX design, volatility and fairness can all contribute to a game's popularity.

Understanding Slot Game Design Principles

At face value, most online slot games seem fairly similar. The player selects their wager, places a bet, spins the reels and hopes for a winning combination. As a result, the popularity of specific slot games can feel arbitrary, or like it's based more on marketing or luck than it is on any real gameplay features.

It's only when you scratch beneath the surface that the truth becomes apparent: slot games that go viral are carefully designed to maximise enjoyment. In other words, rather than being based on marketing campaigns, or even on the amount of money paid out to players, lasting success is about how the game makes players feel.

Many of the design principles behind a successful slot games are also present in other types of games, including mobile games and video games. Examples include visual appeal, a sense of anticipation for the outcome, a reward structure that keeps players coming back, a sense of momentum within the gameplay loop and the element of surprise.

Across platforms, the slots that dominate are generally those that also create emotional experiences.

Volatility and the Personality of the Game

When exploring the mechanics of slots, one of the most important concepts is volatility. In simple terms, the volatility of a slot game governs how it handles payouts to players:

Volatility helps to influence the experience players will have with a slot game and its overall feel.

Low volatility slot games are ideal for players who want to feel the thrill of winning regularly, even if the payout is lower. These games facilitate longer sessions and are good if you don't want to risk chasing the largest wins, going for long periods without any winnings, or experiencing significant swings in bankroll.

On the other hand, high volatility games are perfect for players who want the thrill of the biggest wins, even if it means going extended periods without winning at all. These games will produce the most dramatic payouts and the most memorable moments, but they'll also produce more disappointment and fewer wins in general.

A medium volatility game targets players who are somewhere between these two extremes.

Low, high and medium volatility games can all go viral, but the game developers need to have a clear idea of the type of player they're targeting. From there, they can use tools and resources to ensure the other design features within the game match with this wider vision, creating a coherent player experience.

Reward Structures, Momentum and Retention

Reward structures can also play a key role in helping a slot game to go viral. The most common reward structure for a slot game will resemble the following: a sense of anticipation before the game begins, an action carried out by the player, a feeling of suspense, the reward or outcome being revealed, and a return to the beginning of the cycle.

However, modern slot games rarely have gameplay that's as simple as spinning the reels and waiting for a set of matching symbols. Instead, many of the best games will now include cascade or avalanche mechanics, creating a sense of momentum that adds to the excitement, while games may also offer free spins or bonus rounds.

These more complicated reward structures can increase the popularity of a game because the wins feel more dramatic. For example, a cascade feature will mean winning symbols disappear from the slots, to be replaced by new symbols. This, in turn, can lead to consecutive winning combinations from a single spin of the reels.

Bonus rounds and free spins can soften the blow from a losing game and immediately provide an incentive for the player to spin the reels again. Such features can also help to build a sense that the player shouldn't give up.

Ultimately, the reward structure of a game can determine the amount of money that's spent on it over time. Research from the UK Gambling Commission shows that when winning, 25% of players increase their stake, whereas when losing, this number falls to just 14%. The best slot games reward players sufficiently to keep them spending.

Features, Novelty and the Core Gameplay Loop

Modern slot players seek out games with an interesting range of features, as these can improve the core gameplay loop and make minute-to-minute gameplay feel more engaging and exciting. Every viral slot game is different, but some of the features players may look out for when choosing a game include:

For a game to go viral, it usually has to have at least some degree of novelty to help it stand out from other slot games. The novelty factor and a sense of unpredictability can help players decide to play that particular game over the many alternatives on the market and can also help to sustain player interest in the game.

Sugar Rush is a good example of a slot game that has a combination of some of the aforementioned features. It includes a persistent multiplier grid, cascading reels, bonus spins and a cluster pays system in place of conventional pay lines. Combined, these features help to create the sense that each spin is building to something larger.

Without a sense of novelty and features that surprise players, it's increasingly difficult for a slot game to stand out from the pack. Over time, developers have learned to place an emphasis on surprises, progression systems and other elements that help to differentiate their game from the many rival games out there.

The importance of a robust gameplay loop has only grown in the age of online gaming streamers and influencers. After all, slot game developers want these popular figures to play their game and help spread the word. When games catch on with popular streamers, their audiences are more likely to join in the fun too.

Themes, Graphics and a Strong Visual Identity

Slots games can also catch on with a wide audience as a result of their visual identity. This includes the game's graphics, the way mechanics are presented, and how wins and losses actually look on-screen.

It's worth noting that although the gameplay mechanics are key to retaining players over time, most players make their initial choice based on more superficial elements. For a slot game to stand out from the other options in the genre, it needs to catch the eye of a player browsing an online casino and this requires a coherent visual language.

The top slot games on the scene today will have an easily identifiable theme, which will appeal to players. For example, Sugar Rush has a candy land theme, while Gates of Olympus deals with Greek Gods. The Stake Original game Tome of Life has a mysterious forest theme, while Scarab Spin has an Ancient Egyptian aesthetic.

Top developers work within the framework of their chosen visual theme to create a great gameplay experience. This can include blending the visual theme with sound design and gameplay features that match it.

Fairness, Transparency and the Role of Trust

Another component of a successful slot game is a sense of fairness and transparency. While players expect the game to be based on random outcomes and luck, they want to know that the game isn't being unfairly manipulated behind the scenes and they want a level of clarity about what the house edge is and how likely they are to experience a win.

For example, when you play the game Gates of Olympus, you'll see that it has a house edge of 3.5%. This means that, over time, for every $100 wagered on the game, the casino expects to keep around $3.50, with the remaining $96.50 being paid back out to players. In other words, this house edge is the statistical advantage for the casino.

Most players understand that casinos need to make money and they also accept the premise of luck determining the outcome of a game. Where they draw the line, however, is when there's any possibility of the game being unfairly manipulated behind the scenes, such as outcomes being determined after the game begins, in order to prevent a win.

Provably Fair Gaming

In more recent times, some of the best online casinos have started to offer provably fair slot games. This process involves using cryptographic hashing and both a client-side and server-side seed as part of the random number generation process. As a result, neither side has full control and the casino can't manipulate the outcome.

Just as importantly, this system allows players to verify the outcome after the fact, using their client seed and the revealed server seed to check the result. Provably fair gaming also allows third parties to verify outcomes away from the platform for even greater peace of mind and maximum transparency.

As an example, Stake Originals games are all provided on a provably fair basis. This means a slot game like Scarab Spin provides options to verify outcomes, building a level of trust, which can keep players coming back.

The User Experience and Mobile-First Design

A factor that is sometimes overlooked when exploring what makes a successful slot game is accessibility. Many of the most successful games are simple to get to grips with, easy to actually play, and make it clear what the player is expected to do in any given moment. Furthermore, most modern games also adopt a mobile-first design approach.

While the game itself should be visually appealing, it also needs to function well on a smaller smartphone screen. To deliver on this, developers of successful slot games tend to prioritise simplicity. Think large spin buttons, easy-to-read fonts, reduced clutter and controls that are touchscreen-friendly.

Mobile-first design makes sense because most people in developed countries have continuous access to a smartphone, whereas people tend to spend less leisure time in front of a desktop or laptop PC. While it's still important to provide a positive experience for computer-based players, reaching the mobile audience optimises popularity.

For a true mobile-first approach to slots, the gameplay loop should be kept fairly short, so players can quickly play the game when the mood strikes, even if they only play for a few minutes at a time.

When all of these elements come together, slot game developers can turn their games into truly on-demand entertainment, which can be played at home, on a commute, and virtually anywhere in-between.

The Last Word

Although online casinos offer many different games, slots are among the most popular. With that being said, there are now thousands of options available to players, which can make it very difficult for developers to create a new game that stands out. Nevertheless, some developers are able to achieve viral status and enduring popularity.

Contrary to the beliefs of some, this popularity isn't typically due to marketing alone. The best slot games use excellent visual design to draw players in and they make use of reward systems and a fun gameplay look to keep players engaged. On top of this, standout offerings have unique features and are able to build trust through transparency.

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