Online Slots Payout Percentage: How RTP Works

See how theoretical returns are calculated, why they vary from individual results, and what payout claims do—and do not—establish.
What a Slot Payout Percentage Measures
A slot payout percentage describes the relationship between money staked on a game and money returned by that game over a sufficiently large number of plays. If a slot is described as having a particular payout percentage, the figure represents the share of stakes that the game is designed to return in the long run. The remainder is not a prediction of an individual loss; it is the theoretical part retained by the game’s mathematical model.
The key word is long run. A payout percentage is calculated across many outcomes, not from one spin or one player’s visit. The game’s symbols, reels, paylines, bonus features and winning combinations determine how often different results occur and how much each result pays. When those outcomes are combined across a large sample of play, the total returned can be compared with the total staked. That comparison produces the stated percentage.
Stakes and returns are measured together
The percentage has two essential inputs:
- the total amount wagered;
- the total amount paid back by the game.
It does not measure the amount a player deposits, the balance shown in an account or the size of a single win. A deposit is simply money made available for play. The relevant calculation concerns wagers placed and the prizes generated by the slot.
Suppose a game receives stakes from many spins and pays prizes from those spins. The payout percentage compares the aggregate of those prizes with the aggregate of the stakes. It is therefore a property of the game’s mathematical design rather than a rating of the casino’s banking service, customer support or promotional offer.
This distinction matters when you see phrases such as casino slot machine payout percentage or online casino payout percentage. A casino may offer many slots, and each game may have its own theoretical return. Combining those games into one casino-wide figure would require knowing which games were played, how much was staked on each and which period was being measured. A simple label for the operator cannot replace those details.
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A stated percentage is not a session result
Your own result can differ substantially from a slot’s stated percentage during a short session. You might stake money and receive very little back, or a bonus feature could produce a large return. Neither outcome proves that the game’s long-run measure has changed.
Random outcomes create this difference. The payout percentage describes the expected relationship across the mathematical distribution of results, while a session contains only a limited selection from that distribution. Rare wins may not appear for a long time, then occur close together. A player can also experience an unusually large prize early in a session. The percentage does not tell you when a particular combination will appear, and it does not reserve a portion of the theoretical return for your account.
It is useful to separate three ideas:
- Stake — the amount placed on a spin or game cycle.
- Return — the amount paid by the game in response to outcomes, including any winning feature defined by its rules.
- Payout percentage — the long-run relationship between total stakes and total returns.
Confusing these terms leads to weak comparisons. A player’s balance after playing is not the payout percentage. Nor is the largest win, the number of winning spins or the amount withdrawn from the casino.
Why casino labels can be misleading
People often look for an online casino with the highest payout percentage, the best casino payout percentage or an online casino offering the best payout percentage. Those expressions treat the operator as though it had one fixed return figure. In practice, the return associated with a slot is tied to the individual game and its mathematical configuration. A casino can make a selection of games available, but the operator’s name alone does not identify the percentage attached to every slot.
The same caution applies to phrases such as slot machine payout percentage, payout percentage on slot machines and payout percentage of slot machines. The relevant unit is normally the particular game being assessed. A machine’s stated measure should not be treated as a universal figure for all machines, all casinos or all sessions.
A payout percentage is a property of a game’s mathematical design rather than a rating of the casino’s banking service, customer support or promotional offer.
An average slot machine payout percentage has a narrower meaning still. It would describe an average across a defined group of games or a defined set of play, but the result would depend on what was included and how the figures were combined. It would not tell you the return of every slot in the group, and it would not forecast your next session.
Terms such as payback percentage for a slot machine and casino payback percentage are also used to describe the return side of the relationship. They should still be read as theoretical, long-run measures unless a statement clearly defines a different calculation. The figure helps describe how a game is designed to distribute stakes over time; it does not function as a promise about a particular player’s outcome.
Understanding that boundary is the starting point for reading any payout claim. First identify what is being measured, then ask whether the figure refers to a particular game or to a wider group. Only after that can the number be interpreted without confusing a mathematical property with the result of a short period of play.
How Slot RTP Works
RTP means return to player. In a slot’s mathematics, it is the theoretical share of all stakes that the game is designed to return through its wins over a sufficiently large number of plays. It is also called the game’s payout rate or payback percentage. These expressions describe the same type of calculation when they refer to the slot itself.
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Suppose a game’s published RTP is expressed as a percentage. That percentage is not a target for your account, a forecast for the next spin, or a statement that every player will receive the same return. It is a property of the game’s underlying model. The model combines the possible symbols, winning combinations, prizes, special features and the probability of each relevant outcome. Those components determine how much the game returns in theory when its mathematical process is repeated extensively.
The basic calculation
At its simplest, RTP compares the total value returned by a game with the total value staked:
RTP = total theoretical winnings ÷ total stakes × 100
The calculation concerns the slot’s full set of possible outcomes, not only its visible winning combinations. Losing spins form part of the model because they affect the relationship between the money put into the game and the money paid back. Small wins, large wins, bonus features and rare events also contribute according to how often they are expected to occur and what each event pays.
This is why a slot cannot be assessed by looking only at its largest advertised prize. A substantial prize may have a very low probability, while frequent smaller wins may account for much of the game’s theoretical return. RTP brings all those outcomes into one long-run measure.
The same principle applies whether the stake is described in pounds or another unit. The percentage is a ratio, so changing the value of each individual spin does not change the stated RTP by itself. What changes is the monetary amount represented by each outcome. A higher stake makes each win and loss larger in cash terms; it does not turn a particular spin into a more likely win.
RTP calculation
RTP = total theoretical winnings ÷ total stakes × 100
The calculation concerns the slot’s full set of possible outcomes, not only its visible winning combinations.
Why RTP is theoretical
The word “theoretical” is essential. A slot’s RTP is calculated from its rules and probabilities, then understood as the return that the game would tend towards across a very large volume of play. A real player normally makes only a limited number of spins. That sample may contain more wins than the mathematical expectation, fewer wins, an unusually large prize or no significant feature at all.
The difference is caused by variation in outcomes. Each spin produces one result from the game’s available outcome set. The RTP does not force the results to balance after a loss, nor does it reserve a win because several losing spins have occurred. A previous result does not create a debt that the slot must repay. The published figure describes the aggregate behaviour of the game’s mathematics, not the order in which individual results must appear.
For the same reason, a session can finish with a return above or below the stated percentage without contradicting it. If the amount staked during a session is treated as the reference, the player’s actual return is calculated from the prizes received in that session. That observed percentage is a record of what happened, whereas RTP is the theoretical rate built into the game.
RTP and payout percentage
“Payout percentage” is a broad description of the relationship between stakes and theoretical returns. “RTP” is the standard term used for that relationship at game level. When a casino slot lists an RTP, it is identifying the modelled payback rate for that slot configuration.
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The distinction matters because a percentage can be attached to different subjects. A slot’s RTP belongs to the game and its mathematical design. It does not automatically describe every slot in a casino, every game from a software provider, or the operator’s overall results. If several games have different theoretical returns, one figure cannot accurately represent them all without specifying how the figure was produced.
A game may also exist in more than one mathematical version. The title and visual presentation may remain similar while the configured RTP differs. Therefore, the relevant figure is the RTP attached to the version actually offered in the game lobby, not a number copied from a general discussion of the title. The percentage should be read as part of the game’s stated configuration.
That does not make the figure a promise. It identifies the long-run design parameter used to describe the slot’s payback. It cannot tell you what a particular deposit will return, what the next spin will do or whether a session will end in profit.
How wins contribute to RTP
A slot’s return is built from all of its paid outcomes. A basic winning combination may occur frequently and pay a modest amount. A feature round may occur less often but produce a larger range of results. A rare top prize may have a very large value relative to the stake. Each outcome contributes to the theoretical return through a combination of:
- the probability that the outcome occurs;
- the amount paid when it occurs; and
- the stake used as the reference for the prize.
The game’s RTP is the combined result of these contributions. Removing or changing a feature can therefore alter the theoretical return, even if the reels and symbols look almost identical. Changing the prize structure or the frequency of a winning event can have the same effect.
A paytable shows the amounts associated with visible combinations, but it may not by itself reveal the complete RTP calculation. The full figure depends on the probabilities and rules governing the game, including features that are not captured by reading one prize in isolation. Treat the paytable as one part of the information needed to understand the model, not as a substitute for the stated RTP.
What the figure lets you compare
RTP can provide a consistent mathematical basis for comparing slot configurations. If two games publish different theoretical returns, the higher figure indicates a greater designed return relative to stakes in the long run, all else being equal. “All else” is important: the comparison does not make the games identical in volatility, prize distribution, feature frequency or short-term behaviour.
Important Distinction
RTP measures the theoretical long-run relationship between total stakes and total returns, not a guarantee for any single session.
A higher RTP does not mean that wins arrive more regularly. One game may distribute much of its theoretical return through numerous smaller prizes, while another may place more of its return in less frequent, larger events. Both patterns can produce a similar aggregate percentage while creating very different sequences of results.
RTP also does not measure entertainment value, the complexity of a bonus feature or the size of a possible prize. It answers a narrower question: how the game’s theoretical total returns relate to its theoretical total stakes over extensive play.
RTP is not a prediction tool
Using RTP as though it were a personal forecast creates a false level of precision. If you select a slot because its stated percentage is high, that does not establish what you will receive from a short session. The result still depends on the outcomes generated during that session. The percentage cannot be converted into a guaranteed cash return without changing its meaning.
A simple way to keep the concepts separate is to ask which quantity is being described:
- RTP: the game’s long-run theoretical return relative to stakes;
- session return: the amount actually paid during your selected period of play;
- individual result: the outcome of one spin or feature event.
These quantities can differ substantially. A session return is not evidence that the game’s RTP has changed, and one unusually large win is not proof that the slot will continue paying at that level. Conversely, a poor session does not demonstrate that the stated RTP is false.
For UK players, the percentage should therefore be read as technical information about the slot’s mathematical design, not as a promise attached to a particular play. It may help you understand how a game is configured, but it cannot remove uncertainty from individual spins or determine the result of your session.
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Why There Is No Verified Highest-Payout Casino to Name
A casino does not have one universal payout percentage that can be used to rank it against every other operator. The relevant figure normally belongs to a particular game, configuration, or set of games, while the casino is the platform offering them. Its overall result would depend on which titles customers play, how much is staked on each title, and the period selected for measurement. Change any of those inputs and the apparent percentage can change as well.
That is why a search for the highest payout percentage online casino, or for the highest payout percentage online casinos, cannot be answered responsibly with a single name. A casino may offer slots with different theoretical returns. Even if two operators make the same game available, the comparison still requires confirmation that the same version and settings are being used. A list based only on a casino’s advertising would therefore mix operator claims, game-level specifications and potentially different methods of calculation.
No Universal Ranking
A search for the highest payout percentage online casino cannot be answered responsibly with a single name, as different games have different theoretical returns.
The year in a label does not solve this problem. Calling something the highest payout percentage online casino in 2026 would require a defined comparison date, a complete set of operators, consistent game data and a method that treats all casinos in the same way. Without those conditions, the wording sounds precise while leaving the central measurement undefined.
Regulation is not a payout ranking
The UK Gambling Commission supervises gambling in the United Kingdom, and its remit includes online casino activity. It also covers remote gambling supplied to customers in Great Britain, even when the equipment supporting that service is located elsewhere. This establishes who regulates the activity; it does not create a league table of casino payback.
For commercial gambling in Great Britain, the Gambling Commission is the single regulatory authority. It grants operating licences to businesses and personal licences to individuals working in relevant gambling operations. Those licensing functions address legal permission, compliance and accountability. They do not certify one licensed casino as having the highest return across its entire catalogue.
A licence should therefore not be read as evidence that an operator offers the highest paying online slots or the highest RTP online casino slots. Those are separate claims requiring game-specific evidence. The operator’s licence answers a regulatory question; it does not answer which collection of games produces the greatest theoretical payback.
Why casino-wide comparisons are unstable
An “average online casino payout percentage” can mean several different things. It might refer to a calculated average across selected games, a result from customer activity during a stated period, or a figure presented by the operator without enough detail to reproduce it. These measures are not interchangeable. A selected group of high-return slots could produce a different average from the casino’s full catalogue, while player activity could be concentrated on entirely different titles.
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The same issue affects explanations of how slot payout percentages are calculated. A game-level calculation can be defined using its designed outcomes and their probabilities. A casino-wide figure would need an additional decision about which games and stakes belong in the calculation. Without that boundary, two apparently comparable percentages may describe different populations.
The related term hold percentage creates another possible source of confusion. It generally describes the share retained rather than returned, but calculating casino hold percentage still requires a clearly defined set of stakes and returns. A short reporting period, a particular game group and the whole operator’s activity are different bases. The arithmetic may be straightforward once the inputs are fixed; selecting comparable inputs is the difficult part.
For these reasons, no particular casino can be verified here as the highest-payout operator. A defensible comparison would need current, equivalent and independently checkable data for the same scope. Game-level RTP information may support comparisons between specified slots, but it cannot by itself establish that one casino has the highest payout percentage overall.
How House Edge Relates to Slot Payback
House edge and payback describe the same theoretical relationship from opposite directions. Payback asks how much of the money staked a slot is designed to return over a sufficiently large number of plays. House edge asks what proportion is retained by the operator, again as a long-run mathematical expectation.
House edge 100% − payback percentage
Payback The theoretical share of stakes allocated to winnings
House edge The theoretical share of stakes that the game does not return
The relationship can be expressed simply:
House edge = 100% − payback percentage
So, if a slot has a stated payback of 96%, its theoretical house edge is 4%. These figures are not two separate charges applied to the same spin. They are two labels for the division between the portion assigned to players and the portion not returned through winnings.
Payback describes the player-side share
A slot machine payback percentage, also called its return to player or RTP, is the theoretical share of stakes allocated to winnings. It is calculated from the game’s mathematical model: the symbols, reels, paylines or ways to win, prize values, bonus features and their probabilities all contribute to the result.
This is why slot machine percentage payouts should be read as a property of the game design, not as a promise attached to your account. The percentage does not mean that each spin returns the same fraction of its stake. A winning combination may return nothing, a small prize or a much larger prize, while many spins may produce no prize at all. The stated figure summarises the model across a large volume of play.
Payback therefore answers this question:
What share of total stakes is the game mathematically designed to return as winnings in the long run?
It does not answer how much you will win during a particular visit, nor does it indicate how often a win will appear.
House edge describes the retained share
The slot machine house edge percentage expresses the other side of that calculation. It is the theoretical share of stakes that the game does not return as player winnings. In a slot with a 96% payback, the corresponding 4% house edge is not normally removed from every individual wager as a visible fee. Instead, it emerges from the difference between all stakes and all theoretical payouts across the game’s mathematical cycle.
Configuration Matters
A game may exist in more than one mathematical version. The relevant figure is the RTP attached to the version actually offered in the game lobby.
This distinction matters when you compare a slot’s figures with a table game or a broader casino statistic. A slot’s house edge belongs to that particular game configuration. It is not automatically the house edge of the casino, the operator’s entire slots catalogue or every game carrying the same title elsewhere.
The same slot can also be configured differently. If the available versions have different mathematical settings, their payback and house edge may not match. The title alone is therefore not enough to establish the relevant percentage. You need the figure for the actual version made available to you.
RTP versus house edge
The phrase “RTP vs house edge” suggests a comparison, but there is no conflict between the measures. RTP is the player-return view; house edge is the operator-retention view.
| Measure | What it represents | Direction of the calculation |
|---|---|---|
| Payback or RTP | The theoretical share returned through winnings | Player side |
| House edge | The theoretical share not returned through winnings | Operator side |
If the payback rises, the corresponding house edge falls by the same amount. If the payback falls, the house edge rises. They cannot both increase for the same slot configuration because together they account for the full theoretical stake distribution.
This also explains why a claim that a slot has a “low house edge” is effectively a claim that it has a relatively high theoretical payback. It still says nothing about whether your next spin will win, how large a win will be or whether a session will finish ahead.
House edge is not winning frequency
A common mistake is to treat the house edge as a slot machine winning percentage. It is not. House edge measures the long-run balance between stakes and returns; it does not measure the proportion of spins that produce a winning result.
The same principle applies to slot machine hit frequency. Hit frequency describes how often a game produces a win under its rules, while payback describes the value of those wins in relation to total stakes. Two slots can have similar payback but distribute it differently. One may produce smaller wins more often, while another may produce wins less frequently with greater variation between results.
A game’s hit frequency can therefore affect how its results feel without changing the meaning of its stated payback. Frequent wins do not necessarily mean a lower house edge, and infrequent wins do not automatically mean a higher one. The value and probability of every prize, including feature outcomes, are part of the game’s overall mathematical design.
Why the distinction matters in practice
When you read a slot description, separate three questions:
- What is the stated payback? This indicates the theoretical player-return share.
- What is the implied house edge? Subtract the payback from the complete stake distribution to identify the theoretical retained share.
- How are wins distributed? Look for information about volatility or hit frequency, where it is provided, because these describe the pattern of results rather than the overall return percentage.
Only the first two are complementary measures of the same theoretical total. Hit frequency and volatility describe different features of the game. Neither converts the stated payback into a prediction for a limited session.
The distinction is especially important when a casino advertises “high-paying” or “high-return” slots. Such wording may refer to a stated payback figure, a notable prize, frequent winning combinations or promotional language. A payback percentage can be compared mathematically with its corresponding house edge, but it cannot establish that a particular player will win, that a game will produce regular profits or that one short session will reflect the long-run model.
For online slots, house edge is therefore best treated as a calculation derived from the game’s theoretical payback. It helps you understand how the return is divided, but it does not replace information about the game’s prize distribution and does not predict your individual outcome.
What Can Change the Payout You Experience
A slot’s stated payout percentage describes a theoretical result over a very large number of spins. Your balance, however, is affected by a much smaller sample. That difference is why a game can have an advertised online slot payout percentage while your own session produces a result far above or below it.
Each spin is a separate outcome selected by the game’s random-number system. The result is not adjusted to compensate for earlier losses, and a win on one spin does not make a win or loss on the next spin more likely. A sequence of losing spins therefore does not create a reason to expect an immediate payout. The same applies after a large win: the next outcome is not made less favourable because the game has just paid.
Do
- Identify the specific game and its version
- Use RTP as a technical characteristic of the design
- Understand it as a long-run mathematical measure
Don’t
- Use RTP as a personal forecast for a session
- Treat a high percentage as a promise of profit
- Use a casino-wide figure to judge individual slots
Why short sessions can look very different
The size of the sample matters. In a limited session, a few winning combinations can have a noticeable effect on the balance, particularly when one prize is much larger than the ordinary wins. If those combinations do not appear, the result can be negative even when the game’s theoretical return is relatively high.
Your stake also changes the cash amount attached to every result. Using a larger stake does not alter the slot’s stated percentage, but it increases the financial effect of both wins and losses. The number of spins matters as well: more plays create a broader sample, but they do not turn the theoretical figure into a personal forecast.
This is why asking what percentage slots pay out needs two separate answers. The published figure describes the game’s long-run mathematical return. It does not say that a particular session will return that share of your stakes, nor does it specify when a payout will occur.
How to read a displayed figure
A stated percentage can be accurate as a description of the game’s designed mathematics while still failing to match your immediate experience. Accuracy here means that the figure corresponds to the theoretical calculation under the game’s specified rules. It is not a promise that your balance will follow the same path.
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Do not use the percentage as a target for a session, a recovery method after losses, or evidence that a win is due. “Online slots with high payout percentages” may sound attractive, but the number alone cannot tell you whether a short session will finish ahead. It also cannot establish that online slots have higher payout percentages than another category without a like-for-like comparison of the relevant games and their stated calculations.
The practical distinction is simple: the percentage describes a property of the game over an extended mathematical run; your result records the particular outcomes that occurred while you played. Those are related, but they are not interchangeable.
How to Interpret Claims About the Highest-RTP Slots
A claim that a particular slot has the highest RTP needs more than a prominent percentage. It must identify the exact game, establish which version is being assessed, and show that the figure is the slot’s theoretical return rather than a short-term result. Different versions of the same title can have different settings, so a game name alone may not identify one definite RTP.
A credible comparison also needs a defined group of games. “Highest” can mean the highest figure among a provider’s releases, among games available at one casino, or across a wider catalogue. Those are different rankings. Without the boundaries of the comparison, the statement is too broad to test.
The evidence should also be current and tied to the game configuration offered to British players. A displayed RTP may not apply to every version, platform or configuration. Promotional wording, recent winning results and a player’s own session do not establish a slot’s theoretical return. They describe marketing or outcomes, not the calculation behind the game.
Summary
- A highest-RTP label is only meaningful when the game identity, version, calculation and comparison set are all clear.
- Treat the percentage as a technical characteristic to verify, not as proof of a specific session result.
- Without clearly defined versions and comparable figures, rankings cannot be established.
This is why it is not possible to verify a named slot as the answer to which online slot has the highest RTP percentage. The same limitation applies to lists described as slot machines with the highest payout percentage: without comparable figures and clearly defined versions, the order cannot be established.
When assessing casino slots RTP, treat the percentage as one technical characteristic to verify, not as proof that a particular game will produce the best result for your session. A highest-RTP label is meaningful only when the game identity, version, calculation and comparison set are all clear. Without those conditions, the label is an unsupported superlative rather than a reliable ranking.
What an Average Slot RTP Can—and Cannot—Tell You
An average slot RTP is a summary of a group of theoretical return figures, not a separate performance rate shared by every game. Its meaning depends on what has been included: different games, versions, operators or calculation methods can produce different averages. Without that context, the word “average” provides little usable information.
A broad average online slots RTP may help describe the general level of theoretical payback across a defined selection. It can provide a reference point when comparing a particular game with that group, provided the comparison uses the same basis. A game above the average has a higher stated theoretical return than the games included in that calculation; one below it has a lower stated return. This is a comparison of published mathematical properties, not a ranking of actual results.
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The average cannot tell you what a particular slot will return. Each game has its own rules, winning combinations, bonus features and probability model. Those details determine its stated RTP. Combining several games into one figure removes those differences rather than resolving them.
It also cannot forecast your result from a session. A slot’s theoretical return describes behaviour over a sufficiently large number of plays, while your outcome comes from the specific results produced during the plays you make. A short session may finish with a gain, a loss or a result close to the theoretical figure. None of those outcomes changes the average itself.
Treat an average payout percentage as a reference for a defined collection, not as a target, guarantee or expected cash return. The individual game’s stated RTP remains the relevant figure for that game, and neither measure predicts the result of your next spin.
Payback, Hold and the Casino’s Share
Payback percentage describes the share of slot stakes that a game is designed to return over a sufficiently large number of plays. It is a theoretical measure of the game’s long-run behaviour, not a statement about what your next spin, deposit or session will produce. A slot can return less than its stated payback during one session and more during another.
Hold percentage describes the complementary share retained by the casino in the same long-run calculation. If a slot’s theoretical payback is represented as the portion returned to players, its hold is the portion not returned through winnings. The two measures therefore describe the same expected distribution from opposite sides:
- payback is the player-facing share;
- hold is the casino-facing share.
This terminology can be useful when reading casino or regulatory reporting, but it must not be confused with the result of an individual player. A casino may hold money overall while a particular player finishes a session ahead. The reverse is also possible: a player may lose during a short session even when the game’s theoretical payback is relatively high.
Hold is therefore not a prediction of the casino’s result for a particular day, nor is payback a forecast of your personal return. Both figures become meaningful only across the large volume of play for which random short-term fluctuations are diluted. They describe the mathematical relationship built into the game, while your actual outcome depends on the spins that occur and the wins attached to them.
For UK play, the applicable slot stake limits and required game-cycle timing govern how the game may be offered, but neither rule changes the meaning of payback or hold. A percentage remains a long-run statistical description, not a promise attached to an individual spin.
Is LuckyPays licensed by the UK Gambling Commission?
No. The UK Gambling Commission register dated 26 September 2026 has no entry for LuckyPays or luckypays.io, and remote operators serving consumers in Great Britain must hold the relevant licence.
How can you tell whether an online casino is licensed and legal in the UK?
Check the UK Gambling Commission register for the operator and its brand or domain. A casino serving consumers in Great Britain must hold the relevant remote licence or operate through a white-label arrangement with an existing licence holder.
Which casino games have the highest payout rates?
For slots, compare the published RTP for each individual game: it describes the game’s theoretical long-run return, not a guaranteed result for your session. The payout rate is tied to the specific slot, rather than the casino as a whole.
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Prepared by the Casino Not on Gamstop editorial staff.