Printable Hard Sudoku

Set 1ufnd27. 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 8 6
1 3 2
1 5 4
7 2 8
7 4
5 9 3 1
6 1 9 5
1 9 6 4 7
2 4
Hard #2
3 6 1 4
4 7 5 9 6 8
7 3
9 3
6 1 8
4 7
6 3 1
9 3 7
2 4 7 6
Hard #3
8 7 9 3 4
3 5 2
2 9
7 4 1
8
9 2 1 5 7 8
2 1 3 9
4 8 6 9
1
Hard #4
5 2 6
9 7
7 1 2
4 1 6
5 4 7
4 8
3 9 2
9 8 2 6 3
1 7 4 8 3
Hard #5
6 3 8 2
9 7
3 5 4
6 9 4 2 1
8 3 1 6
1 9 8
3 9
7 2 1
4 6 5
Hard #6
7 2 4 3
2 7 8
1 5
3 5 8 9 7
5 4
7 1
1 6
9 2 5 1 8
7 2 9 4
Hard #7
9 2 3 8
7 8 1 6
4 2 9
3 8
5 2 4
9 4 2 3
2 5 8 6 9
4 5
1 6
Hard #8
9 6 2
7 5 4
4 3 7 2
2 9 3 1
1 6
1 8 5
7 1 4
2 1 3
5 7 9 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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