Slot machines are one of the most popular games in online gambling agency casinos around the world. Each year, thousands of players worldwide join and over 70% of profit online casinos earn is precisely from the video slots. 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 foundation of poker, and contain 50 cards glued on the 5 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 free drink or perhaps a cigar, or something else. This depended on the institution, that was installed a slot machine. To the player it was hard to win since 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 difficult to collect Royal Flush.