Printable Hard Sudoku

Set 16tg3i. 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
6 8 5
8 7 9 3
2 9 8
6 5 7
8 3 6 1
3 1 4
7 5
2 8 6
5 4 6 9
Hard #2
9
6 1
9 5 2 7
3 2 9 4
3 7 1 2
8 2 6 5 3
9 5 1
4 8
1 3 2 5
Hard #3
8 6 4 7
7 2
2 4 3 1 6
5 6 9
6 5 4
9 7 4 8
8 1 5
6 2 1
6 9
Hard #4
6 2 4
1 9 2 8 6 3
1
4 1 3
7 8 9 5
2
2 7 9 3
5 6 2
9 7 6 5
Hard #5
9 4
1 5 6 9
4 1 5 3
6 4 8
3 4 2 6 7
2 8 1 9
3 7 5
1
4 2 8
Hard #6
4 7 6 8
3 1
6 2 5 9 1
3 8 2 9
9
7 4 3
4 7
1 2
7 8 6 3 1 9
Hard #7
5 6 2 4
3
6 7 1 8 9
2 6 7 9 4
3 5 2 7
4 1
5 7
8 2 4 5
8 6
Hard #8
6 1
9 3 7 8
7 3 8
7 4 6 3
9 6 1 5
2 5 9
3 5
8 2 6
7 9 8 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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