Printable Hard Sudoku

Set 1siq1jo. 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
2 5 9
3 7 8 6
6 4 1 7
7 2 9 3
5 4 1
8 6 4
7 6
2 8 4
3 6 4
Hard #2
9 6 3
1
6 5 9 1
5 1 6 7 8
7 4 9
6 8 4
2 9
7 8 6
5 7 1 2 8
Hard #3
9 3 8 2
8 1 9 7 6
7 6
3 9 4 7 8
5 8 1 3
5 7 4
1 9
1 2 5 3
Hard #4
7 3
5 9 1
6 2 7 1 9
8 2
4 8 7 5
9 1 8
8 5 7
7 2 6
2 1 3 5
Hard #5
1 9 5
8 4
8 7
9 2 6
8 5 7 3
3 5 2
4 1 3
5 8 7 2 9 6
7 1 8
Hard #6
4 6 9
3 1
9 6 1 3
7 3 6 5
2 6
6 1 9 2 8
5 7 2
3 5
4 2 5 6
Hard #7
4 9 1 3 8
2 1 7
2 4
8 6 4
6 1 8 3
9 4 6 2
7 9 5
8 4 7
6 8
Hard #8
4 2
6 3 4 9
1 6 9 3 8
3 4
4 6 1
8 5 7 6
1 2 9
9 5 2
6 2 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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