Hard Sudoku
Serious puzzles for confident solvers. Pencil marks are no longer optional.
★ Solved
Brilliant!
Hard Sudoku gives you just 27 to 30 clues. There is far less to grab onto, so disciplined note-keeping and pattern recognition become essential.
What a hard puzzle demands
Beyond singles you will need locked candidates — pointing pairs and box-line reduction — to remove possibilities across units, plus naked and hidden pairs and triples. The solution is still pure logic, but you must chain several deductions together to break the grid open.
Who hard Sudoku is for
Experienced solvers who finish medium quickly and want to flex. If hard still feels comfortable, expert and evil are waiting.
Frequently asked questions
What techniques do hard Sudoku puzzles need?
Typically pointing pairs, box-line reduction, and naked or hidden pairs and triples, on top of singles.