Use 1–9 exactly once in every row, column and outlined 3 × 3 box. Given clues stay fixed. Every puzzle has one solution.
5 Given5 Your entry1 3 Notes
Your tools
Notes toggles pencil marks in empty cells. They stay until you edit or erase that cell; they are not automatically pruned. Undo reverses board edits. Hint reveals one correct digit, prioritizing your selected cell, and stays counted even if undone.
Highlights repeated digits, not every wrong answer.
Keyboard
Arrow keys move; 1–9 enter digits. N toggles notes, Backspace/Delete/0 erases, and Ctrl/⌘ Z undoes while a cell is focused. Tab moves to tools. Escape closes a dialog.
This puzzle
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Easy uses singles. Medium also allows locked candidates and naked pairs. Hard may need deeper search. The technique label reports what our solver used; Medium and Hard puzzles can still be solved with singles.
Saving & pausing
Progress, notes, undo history, time and settings save in this browser when storage is available. Reopening restores an unfinished puzzle paused. Pause hides the board. Opening Help or a confirmation dialog stops the timer; switching tabs also pauses. New asks before replacing your puzzle.
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App updates
Updates apply after all GamesHush tabs and apps are closed. Your saved puzzle stays on this device.