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Written by Steffen Fonvig · Reviewed by Kim Larsen · Last updated

Contents31

How we review slots

Every slot on this page has a full review, written to the same method as the rest of the site. Each one is checked against the game's published data (RTP versions, volatility, max win and feature rules), and each gets one overall score from 0 to 5, shown with one decimal. The score is an editorial judgement rather than a formula, and the review explains what pushed it up or down. You can read the details in our methodology.

A slot review covers:

  • the RTP and the volatility;
  • the maximum win, as a multiple of your stake;
  • the mechanics, such as paylines, ways or cluster pays;
  • the features and bonus rounds;
  • the studio that made the game.

The RTP we list is the highest version the studio publishes, which is usually its default. Your casino may run a different version, so always check the figure inside the game before you play.

We may earn a commission from some of the casinos linked on this site, but that never changes a score. Reviews are written by Steffen Fonvig and checked by Kim Larsen.

How online slots work

Every spin is decided by a random number generator (RNG) the moment you press the button. Each result is independent of the last one. A slot doesn't remember previous spins, so it is never "due" a win, and there is no such thing as a hot or cold machine. Bonus features are part of the same random process: they trigger when the right symbols land, never on a timer or a schedule.

Independent testing labs check that the RNG is random and that the game pays back in line with its stated RTP over a very large number of spins. Our casino guide explains how that testing works and what a genuine certificate looks like.

On screen, a slot is a grid of reels filled with symbols. The paytable, found in the game's menu, shows what each symbol combination pays, how the features trigger and what the rules are. Read it once for every new game: it answers most questions before you spend anything.

The three numbers that matter

Three figures tell you most of what you need to know about how a slot will treat your money. Our guide to RTP and volatility covers them in depth; this is the short version.

RTP

Return to player is the share of all stakes a slot pays back over a very large number of spins. RTP and the house edge always add up to 100%, so a 96% slot keeps 4% on average. It is a long-run figure, not a promise about your session.

Volatility

Volatility describes how the payouts are spread. Two slots with the same RTP can feel completely different: a low-volatility game pays small amounts often, while a high-volatility game goes quiet for long stretches and saves its value for rarer, bigger hits. Same average, different ride. On a small budget, a high-volatility game can use up your money before a feature ever lands.

Hit frequency

Hit frequency is the share of spins that pay anything at all, including wins smaller than your stake. It tells you how often a slot pays, not how much. A high hit frequency can feel generous even when many of those wins return less than you bet.

The same slot, different RTP

Many studios certify several versions of the same game, commonly at around 96%, 94%, 92% and 88%. The casino chooses which one it runs. The game looks identical either way; only the maths underneath changes.

Review sites, ours included, usually list the default figure. The only reliable way to know what you are playing is to open the game's information or help screen at your casino, before you play, and check again whenever you play the same title somewhere else.

In the game, look for an information (i) or help icon, or the rules page in the menu. The figure may be labelled RTP, return to player or theoretical return. If you can't find it at all, treat that as a reason to be cautious.

The difference adds up. Here is the expected cost of every €1,000 you wager, as a long-run average:

RTP version Expected cost per €1,000 wagered
96% €40
94% €60
92% €80
88% €120

The 88% version costs three times as much to play as the 96% one, for exactly the same game on screen.

Slot mechanics at a glance

Our slot mechanics guide explains each of these in full. Here is what they mean when you compare games.

Paylines

Wins land along fixed lines across the reels. The paytable shows the line patterns and how many are active.

Ways to win

Instead of fixed lines, matching symbols on adjacent reels pay from left to right in any position. A common layout has 243 ways.

Megaways

A licensed mechanic where every spin can show a different count of symbols per reel, for up to 117,649 ways to win. More ways doesn't mean better odds: the RTP and volatility still decide the return.

Cluster pays

Wins come from groups of matching symbols touching each other, rather than lines. Le Bandit from Hacksaw Gaming is one example we have reviewed.

Cascades and tumbles

Winning symbols disappear and new ones drop in, so one spin can produce several wins in a row. Gates of Olympus from Pragmatic Play uses tumbles.

Multipliers

Values that multiply a win, either on a single payout or across a whole bonus round. They are often where a game's biggest wins come from.

Free spins

A bonus round of spins at no extra cost, usually triggered by scatter symbols. Free spins rounds often add multipliers or extra features.

Hold and win

Special symbols lock in place while you get a few respins, with the count resetting each time a new one lands. These rounds often carry fixed jackpot prizes.

Bonus buy

You pay a fixed price upfront, usually many times your stake, to go straight to the bonus round. Each round costs more, so losses can build much faster. Bonus buy is not offered on UK-licensed sites.

Max win, win caps and jackpots

A slot's maximum win is shown as a multiple of your stake, such as 5,000x. A very high ceiling usually signals high volatility: the game has to save its value for those rare outcomes.

Some games also have a win cap, which ends the round once you hit the maximum. Check the paytable so you know where the ceiling sits.

When you compare two games, look at the max win alongside the volatility. A modest ceiling with low volatility suits long, steady sessions. A huge ceiling with high volatility suits players who accept long losing runs for the chance of a rare big hit, and who have set a budget that can absorb them.

Jackpots come in two kinds. A fixed jackpot pays a set amount or multiple. A progressive jackpot grows as a small share of each bet goes into a shared pool, and the base game's RTP often sits lower to fund it. That trade-off is worth knowing before you choose one.

What a session really costs

A simple sum shows what you are paying for your entertainment. Assume a €0.50 stake and about 500 spins an hour, which means €250 wagered every hour.

  • On a 96% game, an hour of play costs about €10 on average.
  • On a 92% version of the same game, that rises to about €20.

The cost scales directly with what you put through the game. Double the stake to €1 and the 96% game costs about €20 an hour; play faster or for longer, and the figure grows in the same proportion. Neither the stake nor the speed changes the percentage the game keeps, only the amount it is applied to.

These are long-run averages. Volatility decides how far a single session swings around them: on a high-volatility slot, an hour can end far above or below the average. You can run your own numbers with the cost-of-play calculator on our responsible gambling page.

How to choose a slot

  1. Check the RTP version in the game at your casino, before you play.
  2. Pick a volatility that fits your budget and how long you want to play. Smaller budgets and longer sessions suit lower volatility.
  3. Read the paytable and the max win, so you know what the game can and can't do.
  4. Check the features and rules, including the bonus buy price and any ante bet that raises your stake.
  5. Try a demo first where the casino offers one, so you learn the game without risking money.
  6. Use the filters on this page. Sort by top rated, highest RTP, newest or A–Z, and filter by provider, theme, feature or volatility. Each provider page lists the games we have reviewed from that studio.

Slot myths, checked

  • Myth: a slot can be hot or cold. Fact: each spin is independent, so past results tell you nothing.
  • Myth: a jackpot is due after a long dry spell. Fact: the chance is the same on every spin.
  • Myth: a near miss means a win is close. Fact: a near miss is just another losing result.
  • Myth: changing your stake changes the odds. Fact: the RTP stays the same; a bigger stake only changes the size of wins and losses.
  • Myth: some times of day pay better. Fact: the RNG doesn't know what time it is.
  • Myth: playing more lines improves your odds. Fact: it raises your total stake per spin; the return percentage doesn't change.

Regulation shapes game design

Regulators can set rules for how slots work. For example, UK-licensed sites have banned autoplay on online slots since 31 October 2021, and they don't offer the bonus-buy feature. Other regulators set their own rules, so the same game can behave differently depending on where a casino is licensed.

Playing slots responsibly

Slots are fast and continuous, which makes it easy to lose track of time and money. Set a time limit and a money limit before you start, and treat what you spend as the cost of entertainment.

Use reality checks so the casino reminds you how long you have been playing. Never chase losses by raising your stake or playing on to win money back.

Take regular breaks, and stop when your time or money limit is reached, even in the middle of a bonus round or after a near miss. A slot will be exactly the same game tomorrow, and nothing you missed was ever owed to you.

Gambling is for adults 18+ only. If it stops being fun, you can get free, confidential help at any time.

Frequently asked questions

What is a good RTP for a slot?

Around 96% or higher is generally considered good. Remember that it is a long-run average and that the same game can run at a lower version, so check the figure in the game at your casino.

Can a slot be "due" to pay?

No. Every spin is decided independently by a random number generator. A long losing run doesn't make a win more likely on the next spin.

Why does the same slot show a different RTP at another casino?

Studios often certify several RTP versions of one game, and each casino picks which one it runs. Always check the in-game information screen to see the version you are playing.

What does volatility mean?

Volatility describes how a slot spreads its payouts. Low volatility means smaller, more frequent wins; high volatility means longer dry spells and bigger, rarer wins.

Are high-RTP slots always better?

A higher RTP lowers your expected cost over time, but it isn't the whole picture. Volatility, features and your budget matter too, so pick a game that suits how you want to play.

Is bonus buy worth it?

Bonus buy lets you skip straight to the bonus round, but it costs a large multiple of your stake each time. That makes losses build quickly, so treat it with caution, and only within a budget you have set in advance.

Sources and further reading