Slot machines are one of the most popular games in online casinos across the world. Yearly, thousands of players worldwide join as well as over 70% of profit online casinos earn is exactly from the video professional slots online. History of slot machines is long enough. The very 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 five reels shirts down. layers for the rates used coin and pull the lever, resulting in the rotation of the reels. But since then there was the idea of the payments system, the winner was offered a zero cost drink or possibly a cigar, or another thing. This depended on the institution, that was installed a slot machine. To the player it was challenging 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 that it was challenging to collect Royal Flush.