Sudoku
Classic number puzzle with multiple difficulty levels and a hint system. Fill the 9x9 grid so every row, column, and box contains 1-9.
Created by Hua-Ming Huang
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How to Use
• Goal: Fill the 9x9 grid so each row, column, and 3x3 box contains all numbers 1-9 exactly once • Choose difficulty level (Easy to Very Hard) and time limit (3, 5, or 10 minutes, or stopwatch mode) • Click "New game!" to start • Click any empty cell to select it, then click a number from the number pad below the grid • Use keyboard: Type numbers 1-9 to fill selected cells • Wrong answers reduce your lives - too many mistakes and you lose • Use helper buttons: - Tips: Shows possible values for empty cells - Show solution: Reveals complete answer - Solve one step: Fills one correct cell - Refresh puzzle: Generates new puzzle with same difficulty - Restart puzzle: Clears your entries to start over - Pause/Resume: Stop and continue the timer • Win by completing the puzzle correctly before time runs out