Printable Hard Sudoku

Set 16m0pe6. 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 8 2
3 6 2 1 5 4
5 7 3 1
8 4 7
2
2 5
1 4
8 6 1
1 4 3 5
Hard #2
5 7
2 1 9 8 5
4 9
1 8 9
9 8 4 1 3
5 4
9 5 8 1 7 6
1 2 9
8
Hard #3
3 5 1
9 3
4 2 8 3
2 7 5 8 9
8 5 7
3 2 8
4 3 6 5 2
1 5 7 6
Hard #4
3 4 1
2 3 7 6 9
8 7
7 4
8 5 2 3
6 5
7 2 1 5
3 8 9 4 2
4 3
Hard #5
3 9
5 2 4
1 2 7 5 3
5 7 1 4
8 3 9 2 1
1 4
8 6 7 3 2
2 5 8
Hard #6
2 5 1
4 3 8
8 6 2 9
2 8 3
4 1 2
1 2 5 4
8 6
5 3 7 6 9 8
7
Hard #7
7 1 6
2 6 1 5 9
9 8 4
8 5 6 7 4
7 5 3
4 6 5
6 7 2
9 8 1
4
Hard #8
3 9 4 8
7 5 2
8 5 6
5 7 3 6
4 1 5
4 6
3 4 5 7
8 9
4 8 2 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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