Printable Hard Sudoku

Set 1tc5zmj. 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 5 2
5 4 3 8
7 6 9 3
2 7
1 8 6 9
4 2 7
5 1 8 6
4
6 8 9 1
Hard #2
5
2 8 3 6 4 7 1 9
9 8 5 2
1 3
1 4 7 5 8
5 4
8 1
1 8 2
4 5
Hard #3
3 8
3 1 4 9
6 7
2 9 1 5
3 8 6 1 4
4 8
5 4 9
7 1 9
4 2 5 3
Hard #4
1 3
4 3 9 5 2 6
7 2 4
4 3 7 9
7 2 9 6 1
1 6 3
8 9 5
5 6 7
Hard #5
1 2 7
4 3 6
7 8 1 4
6 7 3
1 9
2 5
9 1 4
8 2 3 9 4 7
6 8 2
Hard #6
5 6
2 1 7
6 2 1 4
6 7
8 4 1 9 3
7 5 9 1
8 3 5
8 5 9 4
3 8
Hard #7
4 5 9
9 2 7 5
7 9 1 3
8 5 3
3 4
2 1 8
4 2 6
7 1 9 3
8 6 2
Hard #8
1 6 2 4
5 3
2 7 6 1
2 3 6 5
6 5 8
1 2 7
1
8 4 7 5 6 2
1 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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