Printable Hard Sudoku

Set 1himt4i. 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
7 8 6
1 3 8 7
5 7 1
5 1 9 4 8
2
4 6 7 3
9 4 8 3
4 3
6 1 5
Hard #2
3 2
2 4 8
6 5 9
3 6 7 5
2 1 9
8 9 2 3 6
4 6 1 9 3
7 8 3
2
Hard #3
5 1 2 4
4 7 9
9 3 7
8 9 4
8 5
9 1
4 9 5 7 3
3 8
3 2 4 6 5
Hard #4
2 9 3
1 3 2
9
3 5 6 8
9 4 1
5 7 1 2
2 4 5 8 7
1 6 4
7 8 1
Hard #5
1 4 2 3
8 6 1 4 7
9 3
8 1 5
1 7 2 4 9
9 6 1 3
7 6
9 7
8 4
Hard #6
1 2 8
9 3 4
2 5 3 8 7
1 6 7 4
2 4 5
6 3 9
9 7 3 6
4
4 6 8
Hard #7
1 7 9
4 7 3 2
8 6 7 4
7 4 5
2 8
1 2 3
3 2 5 8
5 9 3 6
6 7
Hard #8
4 3 1 9
5 2 3 4
8 9
2 3
9 8 3 7
1 9
6 3 4 1
2 5 6 7
1 5 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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