Sudoku - Classic Logic Puzzle

Playing Sudoku is straightforward but requires logical thinking:

• Understand the grid: A 9x9 grid divided into nine 3x3 boxes.
• Fill numbers: Each cell must contain a number from 1 to 9.
• Follow rules: No repeats in any row, column, or 3x3 box.
• Use logic: Deduce which numbers fit in each empty cell.
• Complete the puzzle: Fill all cells to solve the puzzle.

The game starts with some cells pre-filled. Your task is to fill the remaining cells using logical deduction. Each puzzle has exactly one unique solution.

Beginner Tips

• Start with singles: Look for cells that have only one possible number.
• Check rows and columns: See which numbers are missing in each row and column.
• Use notes: Write down all possible numbers for each empty cell.

Advanced Strategies

• Naked pairs: If two cells in a row/column/box have the same two candidates, eliminate those from other cells.
• Hidden pairs: If two numbers can only go in two cells, eliminate other candidates from those cells.
• X-wing: Look for patterns where the same number appears in exactly two rows and two columns.
• Swordfish: Advanced pattern involving three rows and three columns.