Printable Hard Sudoku

Set 1q9iku2. 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 2 9 7
2 4
8 7 3
1 2
3 6 5
6 3 8
9 7 8 6
5 4 2 1
6 7 4 1
Hard #2
9 7
7 6 9 5
9 1 2 6
3 5
5 2 9 6
6 7 4
1 5 6 8
8 2 7
7 2 1
Hard #3
4 2 8 7 3
5 8 9
9 1 7 8 5
8 2
2 1 5 6
7 1 5
4
6 9 7
1 8 4
Hard #4
5
1 2 6 7
5 9 8 2 1
9 1 3 6
7
6 3 8 4 9
8 9
2 3 7 5
6 2 4
Hard #5
7 9
8 3
9 3 2 4 6
9 7 8 6
1 2 9 6 5
3 4 2 9
4 7 3
2 5
1 6
Hard #6
4 9
1 3 2 9 6
7 9 4 5
2 1
1 7
7 9 5 3
3 2 4
2 8 1 5
4 8 9
Hard #7
4 7 6
8
4 1 2
3 8 5
3 9 6 7 2
8 9 2 6
3 9
2 8 3 6
2 7 8 5
Hard #8
1 7
2 7 5
1 6 8 3
2 8
9 8 6
6 4 2 7
4 6 7
8 5
8 9 7 5 4 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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