Printable Hard Sudoku

Set iztenu. 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
5 3 9 8
2 9 4
6 3 2 5 7
9 8 6 7
7
2 9 1 6
1 2 8
4 3
5 8 9
Hard #2
3
6 1 4
8 7
9 1 5 4 6
2 5 9
8 4 7 1
7 5 6 2 9 1
2 3 9 5
8
Hard #3
1 9 8 7
3 4 2
3 6 9
5 2
4 2 1 5 8 6
6 4
8 9 5
1 5 9 6
7 1
Hard #4
8 6 3 2
3 4 6 9
5 9 8
3 6 7
7 9 5 3
2 7
5 9 4 1 3
6 2
1 7
Hard #5
2 5 4 1
5 3
1 9 7 5 6
5 7 3
2 9
1 8 3 6 9
1 3
3 9 7 2
2 6
Hard #6
7 5 9 2
5 1
1 3
1 5 8 9
4 3 7
1 7 9 4
9 8 2 4
5 9 1
1 6 9
Hard #7
5 6
4 8 7 5 2
1 9 4
7 5 4 8 1
8 4
3 1 9 7
7 3 4
8 2
6 3 2
Hard #8
5 4
6 4
6 4 1 7
6 8 9 2 3
7 6
3 1 6 2
7 9 5
3 9
2 5 8 6 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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