The very first gambling machine that bears a resemblance to a slot machine was designed and assembled by the American company Sittman & Pitt in 1891. It was based on poker and proved to be tremendously popular. But the name associated mainly to Slots machine is Charles Fey. He was the one who invented the first mechanical Slots machine named “Liberty Bell”. The original Liberty Bell slot machine can still be seen be at the Liberty Belle Saloon & Restaurant in Reno, Nevada.

The “Liberty Bell” had three spinning reels. Heart, Diamond and Spade symbols were highlighted around each reel, plus the image of a cracked Liberty Bell. After spin if three Liberty Bells came in a row, it gave the biggest payoff, a grand total of fifty cents or ten nickels.

In March 1986, when International Game Technology introduced a game that linked slot machines together with all coins played on machines in the network incrementing a giant pari-mutuel jackpot. IGT sowed each jackpot with its first guaranteed million and from there, the portion of wagers took over, incrementing the life-changing prize on an electronic meter as slot players pumped in coins continuously while dreaming of a new luxurious life.
In 1990s, online games became trendy and slot machines made the move to the Internet and these became even more popular and jackpots became even bigger.