Printable Hard Sudoku

Set 1hbtt5s. 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 7 9 5 8
3 2 9
1
5 3 2 9 8
8 9 7
2 6 1 3
4 5 8
5 4 8 6
6
Hard #2
2
4 8 6 5 7
1 2 3
1 2 3
3 7
8 3 4 5 6
6 1 9 3
9 1
8 6 5 1
Hard #3
2 3 8
6 2 4 5
3
8 7 4 1 5
1 2 6 7
7 9 6
9 7
4 7 8 6
1 4 8
Hard #4
2 7 8
9 7 3 1
7 3 5 9 8 2
8 3
4 6
1
9 2 8 3
8 6 1 4 3 9 2
Hard #5
9
7 5 8 2 3
2 3 6 1
2 5 3
1 3 5 6 8 4
3 9
3 6
1 5 7
3 9 8
Hard #6
8 6 9 7 2
1 4
6 8 1 3
7 1 2 6
9 3 5
5 4
6 7 8 2
5 9
8 4 5
Hard #7
8 4
7 4 9
5 4 8 9
1 2 3 7
7 1 6
7 5 2
8 1 6
6 7 9 5
3 4 1
Hard #8
4 1 7
2 8
8 3 5
4 2 7 9 6
8 3
5 6 2 7 4
6 1 2 3
3 9
2 5 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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