Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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