1
5 left
2
5 left
3
5 left
4
4 left
5
6 left
6
5 left
7
5 left
8
5 left
9
5 left
2
6
7
1
6
8
7
9
1
9
4
5
8
2
1
4
4
6
2
9
5
3
2
8
9
3
7
4
4
5
3
6
7
3
1
8
Quick Guide
Inspired by Zudoku-style docs UX: keep the essential controls and rules directly beside the interactive experience.
Goal: Fill every row, column, and 3x3 box with digits 1 to 9 exactly once.
Shortcuts: 1-9 place number, 0/Delete erase, arrows move, N toggle notes, A auto-notes, H hint, C check, R reset, Esc clear selection.