What does the lucky number of two-color ball mean?

The so-called two-color ball lucky number refers to opening a blue ball outside the normal 6+ 1, which is called "lucky blue ball". That is, if the first six red balls of the lottery you bet match the lottery number, and the blue balls match the lucky blue balls, you will get an extra lucky second prize, and the prize money will generally remain above 800,000 until the end of the prize-adding activity of the Welfare Lottery Center.