Classic Sudoku

Classic Sudoku is the world's favorite logic puzzle — clean, classic, and endlessly satisfying! Fill the 9×9 grid so every row, column, and 3×3 box contains digits 1–9.

• Multiple difficulties: From beginner to expert challenges.
• Leaderboard: Earn points based on difficulty and completion time.
• Helpful tools: Undo, hints, and erase to assist your solve.

Challenge yourself and sharpen your mind!