Printable Hard Sudoku

Set s28o79. 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
8 4 5
2 8
2 8 6 9
5 2
7 3 6 9
1 9 7 4
2 9 7 3
5 7 9
3 6 5
Hard #2
8 2 4 9 7
7 3 5
5 3 6 2
6 2
5 6
4 2 3 9
9 2
8
5 9 7 8 2 1
Hard #3
2 4
9 5
7 3
5 7 6 9
5 7 3 1
4 8 1
8 1 6 5 7
5 6 2 4
1 8 3
Hard #4
2 7 4
8 5 1 3
5 6 9
2 6 8 5
9 6 8 7
4 3
9 7
5 6 2 9 8
7 9
Hard #5
4 7 5 3 1
9 1 7 6
9 3
1 4 5 7
7 4 6
1 4 9
3 6
1 3 8 4 2
2
Hard #6
1 7 5
2 5
2 6 7 9
1 7 6
3 8 1 6
7 5 9 2 8
7 9 3 6
4 9 1
3
Hard #7
8 6
9 1 4
4 7 1
2 8 3 9 4
7 1 6 3
4 5 7 2
6 5 8
3 2 7 1
8
Hard #8
4 5 3
3 9 1 2
7
6 4 7 3 9
9 4 6 8
8 7 6
4 7 6
8 9 7
1 2 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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