Printable Hard Sudoku

Set 1gdo8h8. 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
1 2 9
4 3 7
7 8 4
5 7 2 8 3
3 4 5 6 1
6
6 3 8 1
3
1 9 8 2
Hard #2
1 8
2 1
8 7 3 9
8 9 7 2
6 4
8 3 9
2 3 7 5
7 5 2 4 6
4 8 7
Hard #3
4
5 2 6 7
1 6 9 5 8
2 7 5
3 6 5 2
6 5 3
3 2
6 8 9 1
1 7 9
Hard #4
6 4 3
9 6 3 5
4 3 9 1
3 8 9
6 5 8
9 6 2
9 5 8
7 1 2
2 6 4
Hard #5
6 4 3
2 9
4 8 3 7 1 2
3 8 5
9 3
2 6
6 1 7 5 3
5 8 2 4
8 6
Hard #6
6 1 9
3
5 1
1 4 2
2 9 6 5
3 4 2
2 1 7 4
8 5 2 3 1
9 4 7 2
Hard #7
3 5 6 1
2 1
7 3 9 4 2
8 7 2 3
2 4 1 8
4
4 8 5 6
8 5
9 5 2
Hard #8
5 1 9
7
6 5 8 7
1 6 8 9 4
7 4 5 6 1
4 9 5 3 6 1
6 1
2 9 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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