The lottery crossword is a system for selecting numbers for the lottery game. This method is done by taking the date of the day. The digits of the date are added. The day and month must be displayed at 2 digits and the last 2 digits of the year are taken. Suppose that the day is equal to or less than 9, it must be displayed as 09, the same for the month, the first digit of the day is added with the first of the month, then with the second of the month, then with the first of the year, then with the second of the year and afterwards the same is done with the second digit of the day, if the summation yields a two-digit number, for example 16, the numbers are separated and added until a single 1 + 6 = 7.