Printable Hard Sudoku

Set 1ilt2wq. 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
1 3 6
2 4
4 6 7 5
9 7 3 4
5 9
3 6 4 9
2 7 5
5 6 2 3
1 4 8
Hard #2
1 6 9
6 2 7
2 4 7 9
3 1 4
8 4 2 6
7 1
8 4
8 7 9 5
5 1 3 2
Hard #3
7 3 8
5 4 9
2 9 3 5 6
9 5 8
7 5 2 4
4 1
1 6 2 4
5 8 6
5 3
Hard #4
4 9 3 5 1
6 2
3 8
1 3
8 5 2 4
9 8 3
4 9 2 7
2 9 6
8 6 4 7
Hard #5
1 6 2
5 8
6 2 9
2 7 5 8 3
3 6 4 9
9 8 1 2
3 5 1
5 4 3
1 4
Hard #6
8 4
5 8 4 7 6
1 9 2
9 1
5 6 1
3 5 8
3 8 4 2
3 8 1
2 4 9 5
Hard #7
5 9 2 6 8
6 8 5 7
2 5
4 6 3 2
1 8 4
2 5 4 7 9
1
7 6
7 3 2
Hard #8
8
2 6 4 1
6 5 3 9 7
6 9 2
3 9
1 8 7
9 4 7
3 2 5 9
1 9 3 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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