Printable Hard Sudoku

Set 106aa1r. 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
5 4
6 7 5
3 8 1 5 2
7 1 4 2 3
6 2 7
1 2 9
2 1 5 4 6
4
9 3
Hard #2
9 1 7 3 8
1 2 4 7
6 2
6 8 2 1
2 5 6
3 4
9 3
6 2 7 5
1 4 9
Hard #3
6 4
4 5 9
8 1 9
3 6 4 7
7 8 3
2 9 3
4 2 9 7
2 9 7 4 8
8 9
Hard #4
5 6 9 8
1 2 4
3 8 4 2 5
6 5 4 7 8
8
3 1 5
7 3 6 5
2
7 1 9
Hard #5
2 3 8
3 8 7
4 8 7 3
7 2 4
9 3 4 8 7
5 1 3 2
7 1 2 6
9 8
1
Hard #6
6 4
6 2 7 3 1 8
3 1
3 7 6
4 5 3
2 6
5 9 3 2 6 7
4 7 9
8 5
Hard #7
2
6 8 2 3 7
9 6 5 2
8 4 9 6 5
1 3 8
2 1
1 7 8
5 6 1
9 3 6
Hard #8
1 3 6 9
5 8 1 7
8 4
8 7 5 4
8 6 2
4 5 1
9 1 2
4 3
1 9 3 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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