Printable Hard Sudoku

Set 1id4ddp. 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
3 9 7 2 1
3 8
6 4 5 3
5 2 6 9
4 5 7 1
1 4
8 5 6
2 1 6
9 3
Hard #2
9 3 6 8
2 1 5
3 4 5 7
6 8 5
8 7 5
8 4
5 8 2 9
1 3 7
2 4 8
Hard #3
5 6
1 9 3 6
7 1 5
8 6 4
2 5
6 8 7 9
3 4
2 1 4 7 5
7 2 1 9
Hard #4
1
4 7 5 1 3
6 3 2 8
8
7 6 8 9
5 8 4
4 2 8 3
6 3 9 7
2 1 5
Hard #5
3 8 7 1 6 9
6 4
5 2
9 5 6
2 4
3 2 7
5
8 4 2 3 5 1
1 8 4 9
Hard #6
6 4 1
4 3 6 8
8 7 4
8 9 6 2
4 1 7
5 6 7 3
8 6 3
9 3
2 1 5
Hard #7
1 4
7 5 6
4 9 7 3 5
2 3 7 8 9
9 2
1 4 5
2 7
7 1 3
5 3 8 4
Hard #8
7 8 6 4
5 7 6 8
2
1 3
4 7 1 6
2 3 9 5 4
6 8
1 3 2
2 3 9 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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