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Online Casino Bonuses, Free Spins and Strategies from Experts

SlotAdvise was launched with the purpose of helping people to navigate gambling online. We recommend the best online slot machines, provide detailed reviews of online casinos in the UK, and in general give you the information you need to know. We tell you all about no deposit bonuses, as well as how and where to claim them; about free spins and how to best use them to your advantage; and the details of each casino’s licensing status and if they have had any regulatory problems. We discuss how to determine how good a given bonus offer really is and if the casino is hiding important terms and conditions associated with it. This gives you an overall sense of whether casinos are just trying to make a quick buck and which ones to choose for the best possible gambling and no deposit bonus experience.

Harry Brown

Math Analyst

I'm a slow and steady gambler. I try out a few slots until I find one I'm comfortable with. Then I stick to it making low bets. This doesn't return much money at first but it keeps me in the game until I can get to the free spins and mini-games. Those pay quite a good deal so when I hit I can then collect my winnings and walk away. I suggest it to people who are trying to develop their strategy. After all, you can always try it with a no deposit bonus and see if such strategy fits you.

Steven Jones

UK Casino Expert

I stay away from the most popular slot machines. They tend to be played out. Instead, I look for the lesser-known slots. They tend to pay out more frequently than the big hits do. If you play them you'll often find yourself winning a lot more than you would at a popular game. And some of the less popular games are real gems that just didn't get noticed when they were released. You can always use these promo no deposit bonuses they offer to try and find the one you'll like.

Jacob Clarke

Professional Gambler

I tend to start out betting low with slot machines and then gradually increase my bet. My theory is that you are not likely to score a big win on your first 10 spins. So I place slightly bigger bets every 10 spins or so. This tends to result in me getting good wins when they finally pop up and I'm ready to leave the casino with decent money in my pocket. Note, however, that testing my theory with free spins might bring irrelevant outcomes as different rules are applied to them.
Netent white logo

Popular Bonus Slots from NetEnt

NetEnt tends to have return to player averages of 96% or higher, which means that the online casino is only keeping four percent or less of the money people play with. The rest of the money goes back to the players. That's a respectable return to player average, although a large percentage of that money may go to big wins, so you have to be careful. Still with their high return to player average people who play NetEnt slots have a chance of doing well. Of course, for every £100 you play, you can expect to lose about £4. But that's how online casinos make money.

Spinsane

Spinsane

Spinsane has a 96.29% return to player average. The maximum payout is 250,000 credits and there are 27 pay lines overlaid on a five-reel, three-row formation. During the free spin round, at least one wheel will become entirely wild.
Secret Code

Secret Code

The Secret Code has a return to player average of 96.3%. The most you can win is 200,000 credits. The total number of pay lines is 20. When you unlock three bonus icons you will unlock the bonus game.
Steam Tower

Steam Tower

The return to player average is 97%. The maximum payout is 300,000 credits. There are 15 pay lines. As you advance in the game, you'll move up a tower. Climb to the top to claim 1,000 credits.

Harry Brown

Mathematics Analyst

Actual RTP vs Theoretical RTP in the UK Casinos

You have to take a close look at the theoretical return to player average and the actual return to player average. The actual return to player average is time-based. If an online casino has an actual return to player average of 96% that means that for every £100 played the online casino should only win £4.

Now you have to look at the theoretical return to player average. This means that the online casino has tested the system and it returns the ratio they are advertising. But a few times through it will give out a different return to player average. That’s not productive for us. This is why you want to place your bet on games that have an actual and not theoretical return to player average visible for the players to see.

Then you have to take into account the volatility of the game. This is what the online casinos call “variance.” A game can have a 96% return to player average but a high level of variance. That means you’ll have to be able to lose a lot of money before you score a decent win to balance things out. That can be exciting but risky if you can’t stick it out. For most people, it’s a better deal to find a game with a lower level of variance so that they can bet a reasonable amount of money and expect to have a decent return.

All of this comes together when you are trying to pick the game for you. You want a high actual return to player average and then you have to pick the variance level that is most comfortable for you. A higher variance means bigger wins but also increases your chance of losses. It’s up to you. Consider this when trying to get the maximum from your no deposit bonuses or free spins.

Play'N GO

Popular Bonus Slots from Play'n GO

Play 'N Go has return to player averages generally in the 95% to slightly higher than 96% levels. This is becoming the standard for games played in the UK lately. They have some games with a low variance level that will consistently pay off fairly well. Then they have games with much higher variance levels that will pay off well eventually, but you'll have to invest a good deal of money. Players can choose which games have the variance level they'd like and also take a look at the overall return to player average.

Wild Rails

Wild Rails

Wild Rails has a 96.53% return to player average. The most you can win on a single spin is 450,000 credits. There are 30 pay lines for you to bet on. In this game, you have to search for the wild train and then collect your money.
Tome of Madness

Tome of Madness

Tome of Madness has a 96.59% return to player average. The most you can win on a single spin is 1,000,000 credits. It has zero pay lines, working instead on a cluster-based payout system. There are three wild cards that can substitute for anything you need to win.
Rise of Merlin

Rise of Merlin

Rise of Merlin has a 96.58% return to player average. The most you can win is 500,000 credits. It is laid out in a five by three configuration. There are 10 pay lines. When you are awarded free spins, one icon will be chosen to expand and fill an entire reel.

Online Casino RTP Reports 2019

Return to player averages don’t only apply to individual games at an online casino. They also apply to the casinos themselves. Every so often, independent operators go through and check the actual return to player averages for the entire casino as a whole. Then they release those numbers. They allow players to see which casino is giving the most back to its customers and which ones are being stingy.

According to the latest reports, Mansion Casino has the highest return to player average of any online casino in the UK with a 97.25% number coming out. On the low end, you have Fun Casino with a 96% return to player average, and William Hill with a 96.05% return to player average. All of the other online casinos in the UK come in somewhere in the middle. Betway has a 96.36% return to player average and Bet Victor has a similar 96.35% return to player average.

Casumo is near the top with a 97.23% return to player average and not far behind are Grosvenor with a 97.15% return to player average and Dunder with a 97.06% return to player average. Meanwhile, you have Casino.com with a 96.33% return to player average and All British Casino with a 96.38% return to player average.

All of these numbers seem fairly close together, but they are not. A difference of one percentage point on return to player averages means a lot more money is going out to players – or a lot more money is being held by the casino.

Knowing what the real return to player averages are can make a big difference for the average casino player. It gives you a real sense of what online casinos are working to help the players and which ones are just out for themselves. This is a bit less important for those punters who are willing to make their winnings without risking their own money and mostly rely on free spins and no deposit bonuses. However, we advise people to be careful about where they spend their money in online casinos – and make sure their odds of winning are as strong as possible.

Casino
Average RTP
98.2%
97.9%
98.2%
98.3%
97.5%
97.4%
98.2%
98.4%
97.9%
97.3%
98.9%
98.5%
98.1%
Playtech white logo

Popular Bonus Slots from Playtech

Playtech occupies a weird world in the return to player average world. Some of its games have a low return to player average – as low as 88%, which isn't very strong. Other games though have a much higher return to player average, usually more than 97%. So when you are looking at a Playtech game you must check out its return to player average. It could be excellent. Or it could be awful. Luckily more of their newer games tend to have a return to player average of at least 96%, which is standard. It may be a factor of them evolving with the times and providing a better return to player average as time has gone on.

The Sopranos

The Sopranos

The Sopranos has a return to player average of 94%, which is quite on the low side. It is laid out in a five by three configuration and has five pay lines. The most you can win is 500,000 credits. All of the famous characters from the show are used as icons.
Space Invaders

Space Invaders

Space Invaders has a 96.16% return to player average. With the standard five by three grid, players can win from 10 pay lines. The most you can win is 30,000 credits. All your favorite space invaders from the original video game are represented as icons.
Robocop

Robocop

Robocop has a 96.24% return to player average. There are 25 pay lines and players spin five reels that show three rows. The most you can win is 25,000 credits. There is a mini game where you have to shoot the same three people.

Steven Jones

UK Casino Expert

Online Casino Bonus Offers & Free Spins

When it comes to bonuses, they come in many shapes and forms, such as free spins, no deposit bonuses, etc. And each one works completely differently from the other. That’s why when you are trying to choose a casino, and its bonuses matter to you, exactly how those bonuses benefit you may not be that apparent when you just take a quick look at the online casino. There is a larger picture there that needs to be unraveled before you can understand whether an online casino’s bonus offers are beneficial or not.

I tend to classify bonus offers into four general types. While there might be some wiggle room in between a few of these, they are a decent general guide to what you are looking at in terms of bonuses.

The first type I call “Regular Bonuses.” These are the bonuses that appear regularly on a given casino type. They include promo bonuses (like free spins or no deposit bonus funds), welcome bonuses, repeat deposit bonuses and a whole host of bonuses that you can count on regularly being there for you. Regular bonuses are generally broken down into free spins, deposit matching funds, no deposit bonuses credited into your account and free bets. Nearly all of the money given to you in deposit matching funds or as a no deposit bonus must be played through several times before you can withdraw them. The industry standard is that you have to play through them 35 times. So if you got £10 in matching funds you'd have to place £350 in bets before you could withdraw the money. But just because 35 times play through is industry standard doesn't mean every casino offers it. Some go as high as making you play through the money 99 times. Some are more generous and allow you to only have to play through 20 times. Winnings from free spins, no deposit bonuses and matching funds are also often capped. For example, if you are playing with free spins you may win a progressive jackpot but only be able to withdraw £100 of it. These are distinctions you have to remain aware of when betting through your Regular Bonuses at casinos.
Casino regular bonuses
Next, we have what I call “Seasonal Bonuses.” Just like the previous type, these might include free spins, no deposit bonuses, matching funds and so on. The difference is that these as you might expect come up with the seasons. So in December, you might see banners for a bunch of special Christmas bonuses. In October it will be a bunch of Halloween bonuses. Sometimes you will automatically qualify for these bonuses. At other times you will have to enter a bonus code. If a code is required it will either be on the site, sent to you via email or sent to you as an SMS. Seasonal bonuses tend to have different terms and conditions than regular bonuses so you should check those out. Because of the number of seasonal bonuses available we recommend that the average player have at least 10 open casino accounts so that they can make the most of each one.
Casino seasonal bonuses
Then there are VIP Programs. These can go one of two ways. Either way, they are transparent and for each agreed-upon amount of money you spend, you earn points. Earn enough points and you automatically become part of the VIP programs. But much more common is one where the casino's marketing department tracks how often and how much people are betting. Then they send you an invitation to join the VIP program. At the very least, being part of a VIP program will be assigned an account manager who will help expedite any problems you may be having with the site and receiving some free spins once in a while. Some VIP programs offer a percentage of cashback on your losses. Others have special bonus programs built into them. There are even some that will provide you with tickets to big sporting matches or concert events. You have to be a pretty big bettor to be invited to a VIP program.
Casino VIP programs
Finally, you have “Tournaments.” These take a variety of different forms but are mostly just players playing against players. More often than not there is a leader board and you can track your progress on it. Besides, tournaments only last a given amount of time. When it's over you check the leader board and find out whether or not you've won. Tournaments can be based on any type of game. Some are focused on slot machines and offer free spins as a reward. Some on blackjack. There are even some that are based around baccarat or roulette. Once the game is over then you are either given a cash prize, free bonus money or free spins. It's always a good idea to check out the terms and conditions of any tournament before you start playing. That way you will know exactly what you have to do to be able to win them and not miss out by missing a simple term.
Casino bonus tournaments

Now some things you should be aware of when it comes to bonus offers. They all have limitations, especially the no deposit bonuses. And those limitations can be extremely frustrating to people playing them. But they are important, so you are much better off getting to know them so they don’t trip you up.

  1. The first one is the Minimum Deposit. This seems fairly straightforward but confuses some people. It’s a simple description – to obtain the bonus you want, you have to make whatever they say is the minimum deposit. This will generally be between £10 and £20 but can be both higher and lower. The terms and conditions of the offer will always spell this out so it should be pretty easy for the average punter to find out about. Needless to say, that does not apply to no deposit bonuses
  2. The second is the Validity Period. This is how much time you have to use the bonus. Some casinos give you 30 days to use your free spins or bet through your no deposit bonus money. Some only give you a week. There are even a couple that only allow you three days to use your bonus. Once again this is always spelled out in their terms and conditions so take a close look at them when you are ready to claim your free spins or other offers. If you aren’t going to have the time to use it, it’s not worth it to you.
  3. The third is the tricky one. It’s the Wagering Requirements. You see when a casino gives you either a no deposit bonus or matching funds (“free money” or “bonus money”) it’s not actually free. You generally can’t make a bet with it, win the bet and then claim the money. Instead, you have to play through the money a certain amount of times. This rule is certainly applicable to nearly all no deposit bonuses and even your winnings from free spins. The average amount of times you have to play through the money is 35. But some casinos can ask for many, many more play throughs. So much so that your odds of ever withdrawing the money go down to about zero. This is something you need to check in the terms and conditions of the offer.
  4. The fourth is Game Weight. What this means is that when you are going through the Wagering Requirements different games will give you different amounts of credit for the play through. All slots have the same Game Weight. But no so much with other games. Playing blackjack might only give you 20% game weight. With a 35x play through requirement, if you got £10 in bonus money, you’d have to play it through 175 times instead of your usual 35 times. That’s quite a bit of difference simply by switching from one game to another. Once again this will be spelled out in the terms of service for the bonus offer.
Red Tiger slot games

Popular Bonus Slots from Red Tiger

Red Tiger is sort of an old school video slot provider. They generally have return to player averages that start at 96% and then only go higher. They have the basic games that people like to play and they offer a predictable chance of winning. They do tend to err on the higher variance levels so you may have to play a bit before you can win big. That's not that much of a problem – and you can find a Red Tiger game that has a considerably lower variance level. The workingmen of the video slots game.

Mega Pyramid

Mega Pyramid

Mega Pyramid has a 96.18% return to player average. The gameplay area is in a five by four configuration. There are 30 pay lines. The most you can win is 100,000 credits. The queen is the scatter and can deliver free spins.
The Equalizer

The Equalizer

The Equalizer has a 96.08% return to player average. With five reels and four rows, there are 15 pay lines. The most you can win is 100,000 credits. It's one of the highest variance games around which means you can chase big wins.
Vicky Ventura

Vicky Ventura

Vicky Ventura has a 96.16% return to player average. There are 243 pay lines that pay out on a standard grid of five reels and three rows. The most you can win is 100,000 credits. A bit of a feminist slot, and Vicky herself is your wild card.

Jacob Clarke

Professional Gambler

Win Big with The Best Online Casino Jackpots

Progressive jackpots are one of the most exciting developments for online slots. They started them back in Las Vegas where several slot machines would be linked together, and the jackpot would build up over time. Eventually, when someone won, they would win the total jackpot for all the linked slot machines. Now they are brought together online which is a far larger space. Therefore, the jackpots can build up quickly.

The most well-known progressive jackpot game is Mega Moolah. This game propels people into the million-pound area for potential wins quickly. Provided by Microgaming, it has four progressive jackpots built in.

But there are many other great progressive jackpots out there. Dr. Fortuno, provided by Yggdrasil, is building up quite a following and an equally impressive jackpot.

Then there is From Dusk Til Dawn, brought to you by Novomatic. Based on the popular film, it has an excellent and growing jackpot.

Or you might be interested in Dirty Dancing by Playtech. Based on the iconic blockbuster, its jackpot is interesting indeed and will keep people coming back for more.

Finally, there is Kobushi brought to you by iSoftBet. Its general action involves Ninja fish fighting each other. While the jackpot doesn’t rise to astronomical amounts at Kobushi, it pays off much more often than with the other games. That makes it intriguing, and you will want to play and see if you can track it down.

These are five very different progressive jackpot games. But they all keep the fun moving and the jackpot growing. They are an interesting addition to the regular slot machines that are available anywhere. One more thing to remember: you’d better not play progressive jackpot games using free spins or no-deposit bonus since they usually have a capped payout, meaning you will not be able to withdraw your big win.

Biggest Online Slot Jackpot Wins

Mega Moolah

€17,879,645.12 WIN

In 2015, Microgaming placed its name in the GUINNESS WORLD RECORDS® for paying out the largest online slot jackpot ever, with a one-time payout of €17,879,645.12. That was surpassed again by Microgaming in 2018 with a €18,915,872.81 payout to an anonymous winner who bet only 75 cents on Mega Moolah while playing on his mobile phone.

Joker Millions

€3,042,142.63 WIN

Yggdrasil’s latest big win was in October of this year, when a player from Finland playing on his phone won €3.04 million on Joker Millions. He had bet only 50 cents. This was the third huge jackpot that Yggdrasil paid out in less than a year; all three totaled €14 million.

Gladiator

€1,510,172.82 WIN

Gladiator Road to Rome, from Playtech, hit for one player from Spain for €1,510,172.82 in August of 2019 when he landed nine gold helmets in one spin on the progressive jackpot slot.

Yggdrasil Gaming white logo

Popular Bonus Slots from Yggdrasil

Yggdrasil is one of the most innovating game developers around. And they keep that innovation going with their return to player average. Nearly all of their games have a minimum 96% return to player average and some of them go much higher. They offer a welcoming mix of low and high variance games so there is something for everyone to like when they play an Yggdrasil game. You won't have to worry about the low return to player averages offered by other providers, and you'll probably find a fun game to play because they are excellent at what they do.

The One Armed Bandit

The One Armed Bandit

The One-Armed Bandit has a return to player average of 96.3%. There are 20 pay lines over three rows and five reels. The most you can win is 472,000 credits. Land bonus icons in the free game mode to benefit from lucrative multipliers.
Wild Robo Factory

Wild Robo Factory

Wild Robo Factory has a 96.4% return to player average. It is laid out in a five by three grid. There are 25 pay lines. The most you can win is 359,800 credits. The yellow parts of the robot act as your wild cards and can take up an entire reel.
Jackpot Raiders

Jackpot Raiders

Jackpot Raiders has a 96.3% return to player average. There is a five by three layout and there are 20 pay lines. The most you can win is 160,000 credits. In the bonus game, you are charged with picking safe, risky and very risky. Very risky is hard to win but will give you excellent rewards.