Why Sudoku is fun

Sudoku uses a 9×9 grid. Each row, column and 3×3 block must contain 1–9 exactly once. The given numbers are your clues.

One number can lead to the next.

If a cell has candidates 2 and 7 and a 2 is placed elsewhere in its row, it must be 7. That 7 can help narrow down other cells too.

Find techniques you have learned.

With practice, you start spotting singles and pairs yourself. A step that once needed a hint can become one you find on your own.