Printable Hard Sudoku

Set 1icg9sc. 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
6 8 5
8 7 4
8 3 7
1 4
2 8 9 1 3
6 9 4 8
1 9 2
7 6 3
9 4 6
Hard #2
4 3
7 6 8 5
3 1 9 2
4 6
2 6 3 8
9 1
5 8 6 7 2
7 9 6
2 7 4
Hard #3
8 9 6 1
4 3
6 2 7 8
6 9 8
3 2 4 5 7
1 7
3 8 6
1 5
6 2 1 4
Hard #4
4 3 1 8
5 1 3
2 8 1 7 5
6 9
5 3 6
1 4
9 7 5 6 4
6 7 5
2 8
Hard #5
7 6 1
9 4
9 6 7 2 1
6 9 8 2 5
8 5 2
3 7 6
3 7
1 5 3
4 2 3
Hard #6
7 5 2
3 7 6
1 6 8 9
7 5 8
9 6 4 7
2 1 3 9
9 2 1 7
7 3
6 1
Hard #7
2 6 3
7 1 3 8
8
4 2 5 8 1
3 7 1 6
8 5 9
1 9 3 8 5 2
3 7 4
Hard #8
8 6
1 6 8 2 4
4 8 5 1 7
4 3 5
1 2
9 8 1
5 3 2
2 7 4 6 8
3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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