Published: 14 Sept 2025 | Updated: 3 Dec 2025
Jackpots are a staple of online casino sites. You can play for a wide range of fixed jackpots in numerous slots: these usually pay out for landing specific symbols or activating a bonus.
But many online casino games offer progressive jackpots, too. These may be worth hundreds of thousands of pounds by the time they pay out — or even millions.
What are the biggest jackpots ever paid out by casino sites? Read on to find out. Below, we’ll reveal:
- The top five jackpots won at online casinos over the years
- How progressive jackpots function in casino games
- How players help fund progressive jackpots
Top 5 Jackpots Awarded at Online Casinos
Let’s break down the five biggest jackpots won at online casino sites (at the time of writing).
Book of Atem: WowPot: £15.1 Million
One UK player claimed a massive £15,183,085.96 in 2021. Known as Mr M, the jackpot winner had placed a £0.80 bet on Book of Atem: WowPot, an Egyptian-themed slot released by Games Global.
Book of Atem: WowPot includes four progressive jackpots: Mini, Minor, Major, and the WowPot. Here is the minimum value for each jackpot:
- Mini – £10
- Minor – £100
- Major – £50,000
- WowPot – £2,000,000
The WowPot jackpot value had progressively grown bigger until Mr M won it through a bonus feature.
Mega Moolah: £13.2 Million
Jon Heywood earned the Guinness World Record for ‘largest jackpot payout in an online slot machine game (nominal)’. He scooped €17,879,645 (£13,209,300) on Microgaming’s popular Mega Moolah slot in October 2015.
Mega Moolah is one of the most well-known progressive slots on the market. Its jackpot is triggered at random.
Hall of Gods: £6.3 Million
Hall of Gods is a Norse-themed slot by NetEnt, one of the biggest brands creating casino games. And one Aberdeen man, known as Neil, won a huge prize of £6.3 million on this game in 2017. He wagered £4 on the game before picking up the top payout on offer.
Three progressive jackpots are available during the Bonus Game feature: players click on symbols across the screen to reveal prizes. Matching three of the same jackpot prizes will trigger the corresponding payout. As well as the Mega jackpot, Mini and Midi progressives are available, too.
Mega Fortune: £6.2 Million
In December 2016, a player known only as Chris won £6.2 million on the progressive jackpot slot Mega Fortune. Chris had placed a £1.25 bet on the game before triggering the progressive jackpot.
To win the prize, players need to land at least three special symbols to unlock a wheel-spinning bonus round. The last of three can award the highest payout available. As with other progressive jackpot slots, Mega Fortune’s prize pool had increased with each bet players made until Chris managed to win it.
Jackpot Giant: £4.5 Million
Jackpot Giant is a Playtech slot with a fixed jackpot of 50,000x the bet and a progressive jackpot. One player won the latter — £4.5 million — on the game after betting £4 per spin.
This is the minimum bet that players need to make for a chance to win the progressive jackpot. If anyone wagering a smaller amount lands the required symbols, they will win 1,000x the bet instead.
How Progressive Jackpots Work in Online Casino Games
Progressive jackpots are a popular element of online slots and some live casino games. In some physical casino venues, linked slot machines may award progressive payouts, too.
The jackpots on offer vary from one title to another. While some games might award a top prize of 300x or less, others can pay out millions instead. These slots tend to show the current real-time value of their jackpots during the game, usually at the top or side of the screen. As a result, you can keep track of the maximum potential win while you spin the reels.
However, there’s no way to know exactly how much a progressive jackpot will be when it finally pays out. As the top five winners listed above discovered, prizes can be enormous.
How are progressive jackpots funded? A small portion of each bet (as little as 1%) placed during a game contributes to the prize pool. This consistently increases in value until the game awards the jackpot to a player.
In some cases, progressive jackpots pay out at random. But in others, you need to land certain symbols to trigger a bonus round and play for the top payout instead. It’s best to find out how a progressive jackpot will be awarded before you dive into a game so you understand the structure.
And remember to always responsibly play progressive jackpot games. Focus on the experience of playing and the game’s entertainment value instead of the potential payout.
Conclusion
Progressive jackpot games at online casino sites offer a chance to play for potentially massive prizes. From Mega Moolah to Mega Fortune, there are plenty of options to explore. And Genting Casino has a dedicated Jackpots section with high-paying slots from the biggest brands.
You can play progressive jackpot slots on our desktop site, mobile site, and app. We also offer a range of bonus offers to explore, including free spins on popular slots.
Find an amazing range of slots, live casino games, and more at Genting Casino today!
The house will always have an edge. Never try to chase losses by gambling more. Casino games are games of chance. Outcomes are random, and no wins are guaranteed. Betting more will never change the odds. Always play responsibly and within your means.
