Printable Hard Sudoku

Set icudq4. 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
9 6 8
2 1 9 7
3 6
6 5 8 4
4 8 2 3 6 7
5 2
7 9 3 4 2
6
4 6
Hard #2
1 4 9 2
5
7 9 8 3
2 8 3
4 3
9 2 8
3 7 6 9
5 4 8
6 2 5 8 1
Hard #3
2 6
5 9
3 1 7 9
7 1 6
2 5 6 9
8 5 3
7 4 1 2 5
9 7
8 7 2 1
Hard #4
5 1 9
9 1 4 5 7
2 7
1 4 7 8
9 2
7 5 3
3 4 8 2
9 7
3 2 1 6
Hard #5
8 4 3 7 1
6 7 9 3
9 8 3 6
1 5 6
2 6 4
2 4
2
7 5 3
3 2 9 8
Hard #6
3 7 1 2
9 3 2
1 6 4
3 9 8 6
9 1
7 5 2 9
1 7 5 2 3
8 1 3 7
Hard #7
3 2 7
3 8
1 5 7 6 9 8
2 9
4 9
6 2 1 3
4 5
6 2 7
1 7 5 8 4
Hard #8
6
9 8 4
1 7 4
4 9
8 7 2
3 1 8
9 8 4 6 7 1
6 2 8 9
7 1 5 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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