Printable Hard Sudoku

Set 18amjyv. 8 puzzles with an answer key, ready to print.

Hard puzzles start with about 29 givens and need real techniques: pointing pairs, naked pairs and hidden pairs. Paper is a great way to practice them, because you have to keep your own notes honest.

Each free PDF has 8 puzzles, four to a page on US Letter paper, plus an answer key with every solution. Every puzzle has exactly one solution. A new set appears here every day, or you can grab a different set any time.

Puzzles in this set

Hard #1
6 1 3 8
2 9
9 4 8 6 2
7 3 4
3 1
8 4 7
7 3
3 5 8 1 2
2 8 6
Hard #2
6 4 1 2 7
3 7 6 8
2 6 4
6
2 4 3 8
1 8 9 6
6 4 2 3
5 9
8 9
Hard #3
9 7
5 3
3 4 5
6 2 7 1
2 8
1 3 6 8
4 9 2 6
1 6 3
8 4 2 9 5
Hard #4
3 1 7
7 6 3 9 1
2 6 8
2
6 1 9 4 8
7 6 9
1 8
2 8 4
8 3 2 7
Hard #5
8 7
7 1 6
7 4 3 2 1
7 1 3
4 9
2 4
3 4 2
1 2 4 5
8 4 9 5 7
Hard #6
6 9 5 3
6 7
8 2 1 7 4 5
8
3 9 2 7 1
1 6 3 4
8 9
2 4 6
5 7
Hard #7
3 5 2 1 4
8 9
1 2
1 9
5 7 1
9 8 2 7
1 6 8 5
9 2 7
7 9 6 3
Hard #8
3 8
5 1 2 7 4
9 1
4 9 8
7 8
5 4 3
3 6 7 1 9
1 4 8
2 8 5 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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