Slot machines are one of the most popular games in online casinos across the globe. Per year, thousands of players worldwide join as well as over 70% of profit online casinos earn is exactly from the video slots. History of slot machines is long enough. The first ancestor of modern video slot was invented in 1891 in Brooklyn, New York. Slots were created on the basis of poker, and contain 50 cards glued on the 5 reels shirts down. layers for the rates used coin and pull the lever, resulting within the rotation of the reels. But since then there was the notion of the payments system, the winner was offered a zero cost drink or a cool way to improve cigar, or something else. This depended on the institution, which was installed a slot machine. To the player it was hard to win because the game was to be repaid, and not ruin the institution, often with the drums removed ten peaks and jack of hearts which it was challenging to collect Royal Flush.