Printable Hard Sudoku

Set sz098j. 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 4 7 8
7 1 2
9 6
8 9 7
6 3 4
5 3 4 1 6
3 4
5 3 7 2
2 4 5
Hard #2
4 5 1 2 3
5
7 4 8
5 6 2 3 9 7
3
4 5 8
1 5 9 7
2 9 6
3 6 7
Hard #3
1 4 3
3 1 2 5
8 1
5 1 9 8
7 8 5 6 2
9
2 9 7
6 7 1 2
2 9 3
Hard #4
2
3 6 2 1
9 6 2 8 5
4 6
2 3
8 7 5 4
8 9 7
6 3 7 9 4
4 1 3
Hard #5
8 3 7 9 1
2
9 6 8 2
5
3 6 5 4
1 3
3 5 8
2 5 6 7 4
6 2 9 3
Hard #6
9 4 2 1
8 4 3 5
3 6 5
2 7 3
2 1 7 5 6
4 9 1 3 8
7 8 6
9 5
Hard #7
6 3 7 5 8
3
2 6
6 5 4 7
1 3 2
2 5 8 6
5
5 3 9
3 8 4 9 6 5
Hard #8
5 9 2 4
2 1
8 6 3
2 4 8 1 5 9
6 4 2
7 3 9 5 1
2 4
8 7 3
9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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