Printable Hard Sudoku

Set 1mr25bv. 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
3 9 4
5 1 2
8 4 5 7
7
5 9 2 7
6 4 8 3 1
3 8
1 5 9 3 6
3 6
Hard #2
5 2
2 3 5 4 1
8 7
4 6 7
2 5 7 1
6 7 3
8 6 4 9
9 2 7
3 8 6
Hard #3
7 9
6 2 1 4 3
4 8 7
8
9 1 6 5 4
7 9 4 3 1
4 5
6 2 7
5 6 9
Hard #4
5 4
4 5 7 3 1
3 8
6 1 8
2 8
9 5 6
7 8 4 9
4 9 7 1
2 1 9 6
Hard #5
5 6 7
8 3 6
3 5 7 4
6 2 7 3
3 4 7
4 1 9
2 4 6
3 1 5 2
4 2
Hard #6
4 5 3 7
8
7 9 2 4 3
3 8 2 9
1 6 2
1 8 4
1 3 7 5 4
5 2 7
4
Hard #7
8 9 6 1
9 8 3 7
4 3 9 2
2 3 5 8
3
7 1 8 4
7 3 6 9
6 3
2 1
Hard #8
1 2 5 3
8 1
9 3 7
8 1 4
6 2 9 5
6
8 5
5 3 6 4 7 9
8 7 3 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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