Printable Hard Sudoku

Set u7es1i. 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
2 5
3 1 7
4 2 8
7 8 9 2
3 1 2 7 4
2 5
1 2 6
6 1 5 3 9
9 8
Hard #2
4 9 6
2 1 5
1 2 8 9
6 7 8
4 3 8
5 6
7 1 2
8 6 4
3 7 2 1 9
Hard #3
2 9
5 4 6 1 8
4 7 5 6
6 3 1
9 5 8
3 6 7
6 8
5 4 6 3
7 4 1
Hard #4
5 3
2 3
4 1
9
5 3 7 4 2
6 4 8 3 7 5
9 8 5
8 4 1 3
4 7 5 6
Hard #5
5 2 7 4
6 8 4
9 1 5
5 6 7
1
4 9 3
3 7 1 4
1 6 9 2
9 7 6 8
Hard #6
8 7 6 4
2 5 7
1 8 2 7
9 3 6 5 1
5 4 9
5 2
5 8 7
9 2 1 8 3
Hard #7
5 6 7
3 8 4
2 8 4 5
4 8
2 6 9 4
6 4 7 9
8
5 8 3 2
7 1 2 6
Hard #8
9 1
1 6 9 2
1 6
5 4 3 1
6 5
9 7 4
9 5 4 8 3
2 8 1
1 8 4 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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