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How to Play Sudoku

  1. Objective: Fill the grid with numbers 1-9
  2. Rules:
    • Each row must contain 1-9 without repetition
    • Each column must contain 1-9 without repetition
    • Each 3x3 box must contain 1-9 without repetition
  3. Controls:
    • Click cells to select them
    • Use number keys 1-9 to input numbers
    • Press Backspace/Delete to clear cells
    • Gray cells are fixed and cannot be changed
  4. Difficulty Levels:
    • Easy: 45 empty cells
    • Hard: 55 empty cells
    • Super Hard: 60 empty cells