Loading Sudoku…
Loading Sudoku…
25 verified puzzles
Hard Sudoku has fewer direct clues and requires longer chains of deduction before a number can be placed with confidence.
⌨️ Keys: 1-9 • Arrows • N • Backspace • ⌘Z
Best for experienced solvers who enjoy maintaining candidate notes and looking several logical steps ahead.
Build accurate candidate lists, recheck interactions between boxes and lines, and avoid guessing when a pattern can eliminate options.