This $23.5 million jackpot was awarded to an anonymous individual at the Grand Mondial, a UK-based online casino. It was hit with a bet size of $0.75, and according to the winner, less than 50 spins were played out. When it comes to winning big on slots, this hit is up there with the best!
There are two hugely interesting aspects to this slot big win. First, it was streamed live to thousands of people around the world, and second, the $21 million wasn't from a jackpot. Tyler Niknam, also known as 'trainwreckstv' was the lucky punter, with footage of the hit being available on YouTube.
This is because a portion of the RTP rate contributes directly to the jackpots. The progressive jackpots increase the more players play basically. Below is a table highlighting the RTP allocation for the biggest jackpot slots: As with everything, there are both positives and negatives to playing the best RTP slot games. Below I highlight the main pros and cons with the pros outweighing the cons: Your balance should last longer in theory Found at most UK casino/slot sites Won’t often contribute to a bonus’ wagering requirements Multiple RTP versions available on high RTP slots The slot games with the best Return to Player rates include Playtech’s Ugga Bugga (99.07%), Relax Gaming’s Book of 99 (99%) and Thunderkick’s 1429 Uncharted Seas (98.6%). The slot games with the best Return to Player rates include Playtech’s Ugga Bugga (99.07%), Relax Gaming’s Book of 99 (99%) and Thunderkick’s 1429 Uncharted Seas (98.6%).
RTP stands for Return to Player and is the term used to describe the payback percentage of a casino or slot. With the average around 96% for online slots, the RTP is calculated over billions of spins (theoretical RTP). Open the slot game’s Paytable, Help or Info section where you’ll find the RTP in most cases. If cas free spins on registration uk 2026 not, check the studio’s website or OLBG’s detailed slot reviews. The average RTP for slot games online is around 96%. Not only is this player a resident of the United Kingdom, but he is also a soldier, which perhaps makes this hit even more fulfilling to bystanders. Jonathon Heywood was awarded with roughly $19.9 million when playing at 0.25 per spin. The story gets better, too, as Jonathon claimed he would use a portion of his winnings to look after his unwell father. Arabian Knights by NetEnt is a prime example of a retro online slot.
To calculate your RTP rate for a particular session on a slot game, you need to divide your win amount by the wager/stake amount. Win: If you were to wager £100 and win £120, your actual RTP would be 120% Lose: If you were to wager £100 and won £60, your actual RTP would be 60% The longer you play, the actual RTP should get closer to the theoretical RTP rate. If a slot game’s RTP rate is 96%, the slot site will in theory win 4%. This is calculated over a cycle of billions of spins. You may be the lucky player who walks away with an RTP rate of over 100% but other players will not.
This all balances at over a certain number of spins at the theoretical RTP rate. There are a few ways to find a slot game’s RTP rate. Firstly, reading the detailed slot reviews at OLBG is one way, but no one don’t have details on every single online slot game, unfortunately. You could also head to the slot studio’s website. You’ll find the RTP from the game’s Paytable, Information or Help section within a slot game. It features 5 reels, 3 rows, and 10 paylines, all of which are displayed on either side of the board. In 2011, the associated progressive jackpot for this game reached $17.3 million, at which point it was awarded to a Norwegian player. At number seven, Mega Moolah makes another appearance. However, this will not be its last. Again, this $10 million spin was a result of the progressive jackpot being awarded to Rawiri Pou in 2016. The 27-year-old Rawiri said he wanted to treat his family with some of the winnings. Hall of Gods is another NetEnt slot on our list of big casino wins. It comes with their signature user interface, which mimics a traditional arcade slot machine. We know absolutely nothing about the player that was awarded the mega jackpot, as they remained completely anonymous. However, we can safely say that the slot big win occurred on the 18th of April, 2015. John Orchard is yet another player on this list that was keen to spend the majority of the winnings on his family. Before winning £5.9 million cas online slots real money free spins with a bet size of 30p, John said he was initially planning on buying his daughter an iPad as a gift.
Each studio presents the information differently, with some specifying the RTP rate as soon as you fire up the game. Others mention them deep inside the Paytable or from a small information link at the bottom of the game’s screen. Some slot sites are becoming transparent when it comes to RTP rates. MrQ offers the highest RTP rate on all their slot games. They also display the RTP prominently when firing up a slot game!
Whilst playing the best RTP slot games is great, you should know that studios or slot providers create multiple RTP versions or settings for their slots. You may have noticed that OLBG specifies 2, 3, 4, 5 or even 6 RTP rates for slot games in our detailed reviews. Each slot site can choose the RTP setting they want for each game. This can drastically influence how much money they make from a slot game and how much you can win. If I take a look at the most popular online slot game, Play ‘n GO’s Book of Dead, there is a table below showing 5 RTP versions with the difference for both the site and the player based on the wager of £1,000, £1 million or £1 billion: If you’re a fan of slot games with progressive jackpots, you’ll notice that their RTP rates tend to be lower than standard slot games. After the jackpot hit, however, he decided to buy her a house instead! What better way to round off this list, than with another massive win on Mega Moolah? This time, a $0.50 stake was used, with the progressive jackpot being triggered to award a total of $5.5 million. According to the provider, Microgaming, this was the 13th win that totalled over $1 million across all of their releases. Klaus is now one of many slots big winners to strike it lucky on Mega Moolah! When it comes to being awarded with potential winnings on any slot, it all relies on luck. There is no strategy that can help players increase their chances of a successful spin. While anyone can win big on online slots, the odds are stacked heavily against the player. This is particularly true with progressive jackpot slots, as thousands of other punters may also be spinning at the same time.
However, with more regulation, RTP rates have reduced under 96% in most cases. Slot game providers/studios do offer multiple RTP settings which casinos can choose from. You can calculate a slot game’s RTP rate by dividing the win amount by the wager/turnover figure and multiplying by 100. This will determine your particular return for that individual session. The theoretical RTP rate for online slots is the expected payback percentage over a large number of spins (normally in the billions).
The more you play, the closer to this figure you will get, in theory. While some players have seen large progressive jackpots accumulate in the past, these can occasionally creep up to numbers in excess of $10 million. In this article, we look at the biggest wins of all time from some of the most popular online slots. Keep in mind that this list is based on the winnings in dollars, based on the conversion rate at the time. A $24 million hit takes the top spot on our list of big slot wins. No, there is no trick when it comes to big slot wins.
The outcome of each spin is determined by a random number generator, which cannot be influenced in any way. Some slots can appear to pay out more often than others, but every spin is completely random. It’s impossible to predict outcomes or guarantee how much a game will return, as results are always determined by chance. No, online slots do not remember players. This debunks the myth about certain slots being 'due' if they haven't awarded any potential winnings in a while. Big slot wins are awarded totally at random. Our top slot games page is dedicated to a selection of the finest online slot games of the season.
Here, you’ll find the full list of online slots that are hot favourites of the moment, with a great collection of games waiting to be played on mobile, tablet or desktop devices. Our top slots are a diverse mixture of new, special, and original games. Plus, they come with a huge variety of features too, including bonus games, free spins, and mega daily jackpots. To make the most of our top slots, simply sign up to Grosvenor Casinos.
And don’t forget to claim your £20 welcome bonus (T&Cs Apply) on your first deposit to use on our eligible online slot games. There’s a reason we’re one of the top slot casinos.
This was awarded on the slot Mega Fortune, with the Finnish player spinning with a stake size of $0.25. He was awarded with the progressive jackpot that is available to all players, regardless of cas casino slots uk free spins the bet. The second largest win on an online slot machine occurred in 2021, as a player from Belgium was awarded with €19.4 million. At the time, this translated to over $23.6 million. As for the slot itself, it was created by Triple Edge Studios and has awarded billions of dollars collectively since it was released in early 2020. Our top slot games are some of the most popular games amongst our Grosvenor players. They’re slots that capture the imagination for being classic games or that have new and exciting features. Top slot games excel at bringing you an immersive experience, with exceptional visuals, entertaining gameplay and sound effects to capture the moment. Plus, they have the latest features to boost the gameplay and enhance your potential wins. Whether you’re seeking sunken treasure from the depths of the ocean, want to immerse yourself in a land of fantasy, or globetrot to ancient Egypt, you’re sure to find a theme you love in our handpicked selection in our online casino.
| Slot Type | Volatility | Typical RTP | Win Frequency | Max Win Potential |
|---|---|---|---|---|
| Classic 3-Reel | Low | 96.5% | Very High | 500x bet |
| Video Slot | Medium | 95.8% | High | 5,000x bet |
| Megaways Slot | High | 96.4% | Medium | 50,000x bet |
| Jackpot Slot | Very High | 94.2% | Low | Progressive |
