Printable Hard Sudoku

Set 1t56eh6. 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 3 1
7 1 8
9 1 5 3
7 3 4 9
9 7 1 6
8 9 7
8 2 1 5
6 4
2 3
Hard #2
3 6 8
5 3
1 4
7
7 4 5 2
2 8 3 5 9
2 8 7 1 9 4
5 6 7
9 8 6
Hard #3
4 8
1 8 4 5
6 3 5 9
8 4 7
3 7 9 8 4
9 4 1
9 2 1 5
1 9 6 2
Hard #4
7 5 8 1
6 5
9 1
6 8 5
1 5 3 4 7
7 2
2 9 1 8
3 8 6 4
4 2 6
Hard #5
7 6 9
9 8 1 6
2 3 5 8 4
2 5
4 7 2
6 2 3 7
8 9
2 9
2 5 8 4
Hard #6
1 2 8 9 5
5 2 9 7
4 1
6 3
9 3 1 5
3 6
7 5 8 4 9
3
2 3 7 1
Hard #7
5 7
6 8 7 3
3 2 4
2 9
7 8 4
4 3 2 8 5
7 3 8
2 4 9 7
4 6 1
Hard #8
1 4 7
2 5 6
9 3 4 5
2
1 6 2
9 5 8 2 4
7 2 8 9
5 9 7 3
9 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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