Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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