Slot machines are a mainstay of both brick-and-mortar casinos and online gaming platforms. But despite their popularity, wins on slots can vary widely, even in games with the same Return to Player (RTP) percentage. Take NetEnt’s classic Starburst and its newer In and Out, both of which list an RTP of 96.08%. They also share the same developer, use RNG-based outcomes, and belong to the same NetEnt portfolio. And yet, Starburst’s maximum payout is 800× bet, while In and Out can award up to 12,086×. Factor in their differences in grid size, special features, and multiplier values, and it becomes clear that published RTP is only one part of the picture.
RTP Does Not Predict Your Next Win
Return to Player is a percentage figure representing the theoretical proportion of stakes returned to players over the long term. For example, a game featuring a 96.08% RTP is expected to return roughly that share of total stakes as prizes over a sufficiently large number of spins. NetEnt’s published figures for both Starburst and In and Out fall at this same level. But while these two slots may see 96.08% of total stakes returned as prizes over time, it does not reflect the win size or the frequency of rewards for an individual player, even over multiple sessions at the same machine.
The UK Gambling Commission, which regulates online slots in the UK, clarifies that RTP is an average drawn across a large number of game plays. In a given session, a player can fare better or worse than the theoretical return. The regulator also acknowledges that a game’s volatility, which describes the distribution and size of wins, influences the spread of wins versus losses in the short term.
Every Spin Is a New Random Outcome
Slots are built around a Random Number Generator (RNG) that plays a central part, given its role in producing unpredictable game outcomes. For each spin, the slot draws a new result from an RNG. This generated value effectively maps out the symbols or outcome that will land in view. Today’s regulators pay careful attention to RNGs, mandating that game outcomes must fall within the theoretical range of probability, and that the outcomes continue to be unpredictable.
The RNG ensures that each play is independent of previous outcomes. The idea that a slot becomes “due” for a win after a run of losses, or that a recent win will make another loss more likely, are little more than the gambler’s fallacy. Even so, it is possible to calculate actual RTP for a limited play sample, which is provided as a measure of that sample’s realized return. In the UK, regulators require that this performance be monitored against the game’s theoretical RTP and volatility.
Volatility Changes the Shape of the Results
Above, we expressed volatility as one of the factors affecting actual vs theoretical RTP in the short term. While RTP sets an average return rate, volatility determines how the actual RTP fluctuates around this average, and where the wins and losses are likely to land in day-to-day play. Volatility is commonly described using the standard deviation. A high-volatility slot exhibits larger swings in wins and losses, while a low-volatility slot experiences more stable performance. The lesson? Two games with the same RTP may vary dramatically in both the frequency and size of their payouts. Taking our example a step further, Starburst boasts a hit frequency of 23.00%, while In and Out comes in at 24.97%. That means In and Out, despite the negligible difference in RTP, can still distribute wins very differently from Starburst. RTP alone never tells the whole story, which is why https://casinopro.mx/ looks at games in a wider context, including how often they pay and how their features affect actual play.
The Paytable Determines What Different Wins Are Worth
While much has been made of RTP and how it constrains game outcomes, there are other numbers to look at when assessing a slot’s pay potential. The paytable is one such source. This is a map of the slot’s symbol combinations and the payouts assigned to each, showing the payout value of each combo.
The paytable is one of the levers developers move to create a unique slot experience, and to support the RTP figure. For example, two slots with the same RTP can vary their win sizes by tweaking the maximum payout, whether a base game or bonus round pays out more, and how payouts are structured as multipliers, free games and bet multipliers. It is the ability to shape the slot’s returns at every level of play that makes the paytable so important. Even without delving into individual paytable entries, the fact that slot designs can give one game a “maximum win” of 800× stake – and see that payout as sufficient – but then style another to top out at 12,086×, demonstrates how paytable design influences the potential of each outcome.
What’s curious, then, about slots like In and Out, and what NetEnt has illustrated in its design of this game versus Starburst, is that a slot’s theoretical RTP becomes less and less descriptive of short-session outcomes as the maximum win increases. Beyond a certain threshold, the effect of the game’s RTP on an individual’s short-term results is simply overshadowed by how large the win multiplier can theoretically be.
Same RTP, Very Different Maximum Wins
When comparing slots like In and Out and Starburst, it may seem as though each delivers the same kind of returns from play. But “delivers returns” and “pays out” are not the same, especially when the maximum a slot can pay is so different from one game to another. Their specifications are proof of that. For any player at In and Out, the maximum possible win is 12,086 times the total bet. But for a player at Starburst, the same RTP and different ways to win still limit that player to a top payout of 800×. It follows then, that a higher-volatility slot will concentrate more of its return in larger, less frequent wins, especially when it is built around that kind of feature. RTP on its own hides much of that difference, which is why BestCasinos looks at factors such as volatility and maximum win alongside the headline percentage.
Bonus Features Can Change the Size of a Win
The feature-driven bonus rounds are the subject of considerable interest from slot players, who often associate these extras with the largest wins. In practice, extra rounds function as part of the game’s overall mathematics, and can use different prize distributions, though the specifics of each game must be disclosed. Slots can assign a different return profile to their bonus rounds, for example, as long as it is reflected in the overall RTP.
Again, In and Out is an example of just how impactful a slot’s bonus features can be. While the game’s official details do list dedicated bonus features, In and Out can also activate its Heist Mode, during which its play area can grow into a massive 8×7 grid. The In and Out paytable makes this additional game area significant, and helps explain why the maximum win reaches 12,086× bet. Recent official specifications have listed a maximum win of 12,086× bet for the slot’s online version, showing its capacity for large wins. Starburst’s Wild Respins feature also shapes its returns, automatically triggering a Respin if an Expanding Wild lands in view.
It’s also possible, and increasingly common, for different slots to roll out entirely differently, with free games, multipliers and win boosters styled as part of a centralized feature menu – such as NetEnt’s Elevate Feature, which provides access to different bonus modes.
Progressive Jackpots Add Another Variable
In the UK market, progressive slots are specifically monitored, tested and explained to players, given that the changing jackpot pool creates an entirely different set of variables around payout and game performance. Outside of progressives, many slots come with a fixed maximum-payout model. But a progressive slot does factor in player contributions, which constantly shape the size of the communal prize pool. Whether it’s linked or standalone, a progressive jackpot operates as an entirely separate variable on slot outcomes. A standard, fixed-payout slot may settle in at a theoretical RTP of around 96%, while its progressive cousin may use a different RTP. But compared to slots all with the same RTP, the player’s theoretical return can be roughly the same, because the large prize changes the distribution of gains vs losses.
What Players Should Check in a Slot’s Rules
For an individual player, over a short play session, RTP, volatility and paytable can seem more like theoretical numbers than useful measurements. But these variables actually have a big impact on a player’s experience at the game. Overall, players should check the RTP, the game’s volatility (often stylized as “high”, “medium” or “low”), details on features, the spin hit rate, and any information on the game’s maximum payout limits. Published examples where large payouts have occurred can also illustrate, but not determine, a game’s short-term variability.
Overall, slot players should bear in mind that, while RTP constitutes a game’s long-term payout average, individual play sessions are determined by factors like the game’s volatility, bet sizes, and any bonus-feature rules. A game’s paytable will map out its behavior at every level, while progressive status adds an extra variable. With these details, a player can get a more precise picture of how different games are structured.