The software engineer’s almost $40 million payday was more than 3.9 million times more than his initial bet. He waged $100 on a Megabucks slot machine and won the largest slot winnings in Vegas history. On March 21, 2003, an anonymous 25-year-old software engineer stopped to play slots at the Excalibur in Las Vegas. No Hacking Required for Biggest Jackpot Ever Las Vegas is home to over 165,000 slot machines, according to UNLV’s Center for Gaming Research.Ĭlick through and check out these seven normal people that quickly learned what it’s like to be a millionaire. Pulling a slot machine is more luck than skill, but many people can’t resist the allure of getting rich fast.