Printable Hard Sudoku

Set swztn8. 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 7 5
5 3
3 9 5 4 7
6 8 5
9 7 1 6 3 4
1 2 6
2
5 8
1 9 5 3
Hard #2
8 5 3
2 7 3 9 5
4 7 1
1 8
3 2 7 5
7 1 9 2
5 3
4 9
8 1 2 7
Hard #3
7 8 4
7 5
4 6 3 9
6 4 9
2 5
6 5 8 3 9 1
5
7 1 6 2
9 4 7 1
Hard #4
9
1 5 4
1 2 9 8 3
5 8 6
7 4 9
9 3 4 7
7 9 3
5 8 6 1
1 2 7
Hard #5
6 9 4 5
7 6 2
1 9 3
4 8 1 6
2 9
3 1 5 4
8 1 3
2 3
3 2 5 1
Hard #6
8 3
1 5 3 2
6 8 1 9 7
3
4 2 8
2 8 5 9
7 3 8 4
4 5
3 1 5 9
Hard #7
1 3
2 6 9
7 8
7 5 3 4 2
2 8 5 1
4 6 3 9
2 7 4 8
3 8 5
3 4
Hard #8
1 8
1 4 2 7
5 1 6
1 4
5 3 7
8 6 3 5
7 6 9 4
1 9 2 4 8 7
1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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