The goal is to fill the 9×9 grid so that every row, column, and 3×3 section contains all digits from 1 through 9 without repeating.
Features & Controls
• Pencil Mode: Enter candidate notes into empty cells.
• Highlighting: Tap any digit to highlight every matching digit across the board.
• Auto-Check: Violations in the same row, column, or 3×3 box highlight in red.
• Daily Mode: Synchronized daily puzzle updated every midnight in your local timezone.
Keyboard shortcuts: Digits 1-9, Backspace/Delete to erase, 'N' for pencil mode, 'Z' or Ctrl+Z to undo, Spacebar to pause.