Vim Sudoku
Undo (Ctrl+Z, U)
00:05
5
4
1
9
1
6
2
5
2
3
5
6
1
7
3
8
3
2
9
7
6
4
5
8
7
2
3
1
2
1
4
8
6
9
3
9
7
6
1
2
6
5
1
9
3
4
1
2
3
4
5
6
7
8
9
Congratulations
You completed the puzzle in
!