Printable Hard Sudoku

Set oj93r6. 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
7 1 4 9 2
2 3 1 7
8
5 4
9 4 7 8
9 1 3
1 5 2 4
8 3 6 1
Hard #2
5 3 6
5 3 7
6 9 2 8 1
5 3 1 6
4 8
6 7
4 9
2 9 3 6 7
6 5 4
Hard #3
9 2 1 3 5 7
1 9
4 8 7 2
6 4
5 8
2 9 3 5
7 9 1 2
6 7 3
4 5
Hard #4
9 3 2 4
2 5 9 8
6 1
1 4 7
3 2 9 8 1
1 9 7 8
7 1 6
7 2
5 8
Hard #5
5
2 6 3 4
9 1 3
2 1 6 7
9 8 1 2 5
7 6
1 7 3 4
3 9 7 2 8
8
Hard #6
1 5 6
7 9 1
8
2 4 1
1 6 3 8
1 8 2
4 7 8 2 6
4 5 1 8
8 6 3
Hard #7
4 5 3 6
3 1 8 7
9 2
3 5 6
2 8
1 9 6
5 2 8 3 6
6 9 8
8 3 4
Hard #8
8 5 7 1 4
1 9
2 4 9
4 2 8 6 7
2 4
2 8
6 1
7 5 4 8
6 3 8 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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