"In a 9 by 9 square Sudoku game:
Every row of 9 numbers must include all digits 1 through 9 in any order
Every column of 9 numbers must include all digits 1 through 9 in any order
Every 3 by 3 subsection of the 9 by 9 square must include all digits 1 through 9"
No maths. Simple logic and bit of patience.You can google on Sudoku to find a lot of sites having Sudoku puzzles.I have somehow found a lot of satisfaction solving these puzzles.