There are numerous examples of people winning huge amounts through online progressive jackpot slots. The biggest win was a staggering $21.7 million on Mega Moolah, won by an anonymous player at Grand Mondial Casino. Mega Moolah also holds the second best, a Canadian playing scooping over $20 million at Zodiac Casino. Only slightly behind is the third biggest, belonging to NetEnt’s Mega Fortune, and snapped up at Paf Casino.