1. Excalibur

March 21, 2003, a very lucky 25-year-old software engineer bet $100 on a Megabucks slot machine and won almost $40 million which is 3.9 million times more than his initial bet. It’s still largest jackpot in Las Vegas history.
Total Winnings: $39,710,826.36
2. Desert Inn

In January 2000, cocktail waitress Cynthia Jay-Brennan won almost $35 million playing a Megabucks machine at the Desert Inn. Unfortunately, a few weeks later, she was involved in car crash by a drunk driver which left her paralyzed and killed her sister. This started an urban legend/ myth that bad things happen to those who win big Vegas jackpots.
Total Winnings: $34,955,489.56
3. Palace Station

On November 15 1998, a retired flight attendant initially started by putting $100 then ended up putting in $300 in a Megabucks machine and finally won over $27.5 million. Just being real, this is her second time winning. Previously she had won $680,000 on a Wheel of Fortune slot machine.
Total Winnings: $27,580,879.60
4. Bally’s Resort

On March 27, 2002, Johanna Huendl was on her way to breakfast and stopped to try her luck and play the Megabucks slot machine with $170. To her surprise, she won over $22.5 million. Initially, she misread the meter and thought she had won $2 million. But, later, she realized there was an extra zero at the end. She was just visiting Las Vegas for vacation and became a millionaire at the end of the trip.
Total Winnings: $22,618,156.67