Hard Sudoku

Hard sudoku puzzles need pencil marks and techniques like naked pairs and pointing pairs. Play today's hard daily puzzle or press New for unlimited ones — every grid has exactly one solution.

Also try: All levels · Printable sudoku

How to play Hard Sudoku

  1. Tap a cell, then a number (or type 1–9).
  2. Use Notes to pencil in candidates.
  3. Each row, column, and 3×3 box must contain 1–9 once.
  4. Switch level any time from the Level menu.

FAQ

How is hard sudoku different from other levels?

Hard sudoku puzzles need pencil marks and techniques like naked pairs and pointing pairs. Levels are graded by how many clues are given and which techniques are needed.

Can I print hard sudoku?

Yes — use Printable Sudoku to print 1–6 hard puzzles per page with answer keys.

More free puzzles