Hard
Hard
Welcome to our 16×16 Sudoku puzzle set, designed to help players master Hard Sudoku! This is Set #9 in our collection of free, printable puzzle resources.
Practice Problems
1
A
1
3
2
D
7
A
0
4
F
B
3
E
D
2
D
4
5
0
8
D
B
3
9
C
1
2
C
F
4
3
B
7
C
5
4
8
5
D
7
1
0
6
5
A
2
9
1
F
C
B
5
8
F
8
3
F
8
E
8
9
2
4
C
6
4
A
9
3
F
D
1
3
5
E
3
B
8
5
A
9
2
3
8
D
7
0
1
6
C
4
A
7
9
0
B
4
D
E
F
6
7
3
7
F
A
2
D
9
C
5
8
C
8
5
4
F
A
2
3
0
7
F
5
5
B
E
1
3
D
F
2
6
5
8
4
E
2
1
B
6
D
5
7
3
6
9
5
E
D
3
2
F
7
9
B
F
4
F
D
8
4
6
Show Answers
1.
5
0
A
4
B
9
C
F
1
7
E
8
3
6
D
2
D
7
C
8
A
E
5
0
2
3
F
6
1
4
B
9
F
B
3
E
8
2
6
1
A
D
9
4
0
C
5
7
2
9
6
1
D
3
4
7
B
5
0
C
E
F
8
A
6
D
B
3
7
A
2
9
F
8
5
0
C
E
4
1
1
5
2
C
F
6
0
4
3
9
B
E
7
8
A
D
9
F
7
0
1
8
B
E
C
4
A
D
5
3
2
6
4
8
E
A
5
C
D
3
7
1
6
2
F
0
9
B
8
6
D
5
E
4
A
2
9
C
3
1
B
7
F
0
E
C
F
7
0
1
9
B
4
6
D
5
2
A
3
8
B
A
4
2
6
5
3
D
0
F
8
7
9
1
C
E
0
3
1
9
C
F
7
8
E
B
2
A
D
5
6
4
3
1
8
B
9
0
E
5
6
2
4
F
A
D
7
C
C
2
5
6
4
7
F
A
D
E
1
B
8
9
0
3
A
4
9
F
2
D
1
C
8
0
7
3
6
B
E
5
7
E
0
D
3
B
8
6
5
A
C
9
4
2
1
F
2.
3
8
D
7
B
0
E
9
F
2
4
1
A
6
C
5
4
F
A
6
5
1
3
8
B
C
0
7
D
9
2
E
2
0
1
B
4
A
D
C
5
6
9
E
8
7
3
F
E
9
5
C
2
F
6
7
3
A
8
D
1
0
4
B
7
3
E
1
F
5
4
0
A
B
6
8
2
D
9
C
6
4
0
F
A
2
9
B
C
1
D
5
7
8
E
3
9
C
8
5
7
6
1
D
2
4
E
3
F
B
A
0
A
D
B
2
3
8
C
E
0
9
7
F
6
5
1
4
5
B
4
E
C
7
F
1
6
3
A
9
0
2
D
8
F
2
C
3
0
9
B
6
8
D
1
4
E
A
5
7
8
7
9
0
D
3
A
4
E
F
5
2
C
1
B
6
1
A
6
D
8
E
2
5
7
0
C
B
3
4
F
9
0
1
2
4
6
C
7
F
9
5
3
A
B
E
8
D
C
6
3
A
E
4
5
2
D
8
B
0
9
F
7
1
D
5
7
8
9
B
0
A
1
E
F
C
4
3
6
2
B
E
F
9
1
D
8
3
4
7
2
6
5
C
0
A