Sudoku is a game of logic - the object is to complete the grid such that every row, every column, and every 3x3 block contains the digits from 1 to 9. No mathematics is required to solve the puzzles, just pure logic and reasoning.
If you run a small local community newsletter, I can offer one of the popular Sudoku puzzles free of charge. The Sudoku image you see on this page is the puzzle I will provide, but this one shows 'SAMPLE' within the image.
However, the free Sudoku puzzle I will send you will not show this watermark. I will also send you the finished Sudoku puzzle. For a small fee, you can set up a subscription for a weekly/monthly Sudoku, or indeed any other puzzle you can find on KNS Puzzles. At my discretion, this fee can sometimes be waived.