Printable Hard Sudoku

Set 1to0ovx. 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
5 8
4
6 8 2 4 3
6 2
8 5 6 7
2 1 5
2 9 7 8
3 6 5 1 7
7 2 6
Hard #2
4 6 7 8
4 3 8
5 1 9
1 8 6
9 3 2
3 4 5 8
6 9 7
3 6 2
1 2 3
Hard #3
3 2
9 5 8 7 3
2 5
6 4 2 3 1
9 3 4 6
8 2
8 7 4 6
1 6 8
4 5
Hard #4
9 7 1
7 8 2 5 6
1 3
6 2 5 1 3 8
9 2
5 6
3 1
6 5 7
4 2 9 6
Hard #5
8 6 7 9 4
5 8 6
9 3
7 5 8
4 1
4 7 5 2
9 4 7 6
7 3 2 8
6 8
Hard #6
8 3 2 7
4
8 9 5
2 9 6 7 5
4 3 8
1 3 7
5 7
9 2 6 4 8
3 9 7
Hard #7
6 9 7 8 1
5
3 9 8
2 3
8 1 3 9 2
5 3 9 4
2 4 1 9
1 4 6
7 8
Hard #8
8 5 9
3 2 5 6
4 9 7
4 7 5 3 2
3 1 2
5 7 8
9 4 5
5 3
1 5 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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