Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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