Objective

Fill the 9×9 grid with numbers from 1 to 9 so that each row, column, and 3×3 box contains every number exactly once.

Rules

• Each row must contain the numbers 1-9 without repetition
• Each column must contain the numbers 1-9 without repetition
• Each 3×3 box must contain the numbers 1-9 without repetition
• Some numbers are already provided and cannot be changed

How to Play

• Click any empty cell to select it
• Use the number pad below or your keyboard to enter a number
• Dark numbers are given at the start and cannot be changed
• Blue numbers are your inputs and can be modified

Difficulty Levels

• Easy: More numbers are provided at the start
• Medium: Balanced challenge with moderate starting numbers
• Hard: Fewer starting numbers, requiring more advanced strategies

Tips

• Start with rows, columns, or boxes that already have several numbers filled in
• Look for cells where only one number is possible
• Use the process of elimination to determine possible numbers
• Take your time - Sudoku is about logic, not speed