Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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