Printable Hard Sudoku

Set 1ktb1fj. 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 4 9 1
1 2
4 7 9 5 2
4 2 8 9
5 9 3
7 6 1 5
4 9 3
1 8 4
6
Hard #2
5 4 2
1 4 7 3 8
9 3
9 7 8 5
3 1 6 9
4 2
9
6 5 9 7
2 8 4 6
Hard #3
4 3 8 1
8 5 9
7 6 4
7 3
5 9 6 1
1 7 9 2 5
9 3 5
3 7
1 6 3
Hard #4
3 9 6
5 9 2
4 3 1 5
4 6 2 7 3
2 4 8 9
1 7
8 2 9
2 9 6 4
8
Hard #5
5 2 8
7 2 8 1
6 5 2
3 1 2 9
7
7 3 6 8
8 5 9 7 1
1 6 3
4 8
Hard #6
4 8
1 5 7 8
4 2 3 9
3 1 9 7
8 9 7 6
2 8 1
2 4
8 2 5
3 6 2
Hard #7
3 2 8
7 6 8 2 3
8 6
9 4 2
3 7 4 5
4 6 1 9
2 7
9 4 1
3 6 1
Hard #8
2 5 3
3 2 8 6
4 6 7
8 1 5
7 3
8 4 3 6
9 2 7 8 1
4
3 5 6 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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