Printable Hard Sudoku

Set 1v17fgp. 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
4 1
5 2
2 9
2 8 4 5
4 1 9 2 8
9 5 7 4 3
3 9
9 6 5 3 8
8 2
Hard #2
2 4 1 9
6 9
5 6
6 3 8 5
9 7 4 6
5 3 2 1
4 2 9 1
7
5 6 1 4
Hard #3
5 7 3
4 8 5 9 6
1
1 6 7 2 9
9 4 8 3 6
2 5 4
6
5 7
8 9 7 1
Hard #4
3 5 7 6
5 6 9
1 4 9
8 2 4
7 3
9 4
8 4 2 6
9 6 8 2 3
7 5 4
Hard #5
4 8 5 3
1 3
3 6 1 2 9
9 2 3 1 8
1 7
4 7
2 3 5
6 9 7
5 1 7
Hard #6
4 8 1 7 9
9 1 2
2 5
7 5 6 1 4
1 5 4 9 3
9
7 2
3 2 6
6 7 1
Hard #7
8 2 7
6
5 4 1 6
7 9 2 1
4 8
5 4 8 7
2 1 3 8
3 6 2
8 4 9 6
Hard #8
4 2 8 3
1 5 6 4
3 5
6
4 7 8
1 5 8 7
7 5 3 4 6
3 1 6 9
2 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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