Printable Hard Sudoku

Set 1t7s0hf. 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
4 2 6 1 8
8 1 9 4
5 8 7
6 3 9 2
1 3 4 9
7
4 7 1
6 4
1 3 8
Hard #2
2 3 9 5
9 4
3 6 2
7 2 8
9
2 6 1 3 5 9
5 1 7 3 8
9 6
8 4 1
Hard #3
3
8 2 4 3
7 2 5
1 3 7
1 2 6 7
6 3
7 5 9 1
8 7 2
7 4 8 3 6
Hard #4
4 5 6 8 1 9
7 4
7 5 2
2 8 1 3 4
2 9 8
3 5
8 9 4 7 3
3 4 6
Hard #5
5 9 7 2
9 8 4
2 5 8 1
7 1 2 5
4 6
3 1 4 6
3 7 8
8 9 4 6
8
Hard #6
6
3 1 5 2
6 7
1 5 4 7
5 6 1
2 4 7 6 3 9
9 8
1 9 7 8 5
8 7
Hard #7
7 1 4 2 5
9 3
2 7 4 6
9 8 2
3
2 6 9 4 8 1
3 1 5 9 8
7
6 5
Hard #8
1 9 2
6 9 7 3
5 7
4 7 9
6 1 5 8
3 9 6 4 7
3 8 4
9 1 4 8
3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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