The number-one biggest win on online casino jackpot game happened in 2013 when a man from the Finns in his 40s was gambling at Scandanavian online casino. He placed an online bet of only 0.25 cents on the Mega Fortune progressive jackpot slot. To his shock, the video slot went tremendously wild and quickly got an epic win of $24 million, setting up the craziest win world record ever.