Printable Hard Sudoku

Set 1mkt5a6. 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 2
4 9 5
8 7 4 2 9
3 7 1 2
7 9 4 8
5
5 9 6 7
1 7 5
8 1 3
Hard #2
7 9 5 1
2 8 1 3
1 7
2 7 9 8
4 8 5
8 5 6
6 4 1 3
4 5
2 5 6
Hard #3
3 7 4 6 1
7 6 2 9
6 2
3 8 4
8 7 9
5 6
7 5 8 4 2
5 3
2 1 6
Hard #4
4 9 8
7 2
9 7 3
3 7 8 6
2 1 8 5
5 3
7 6 3 2 4 9
2 8 6 7
1
Hard #5
2 8 7
4 6 1 3 8
6 2
4 7 9
3 8 2
2 6 8
7 8 5
5 3 7 4
9 1 6
Hard #6
2 3 5
9 6
7 6 3 5 8
8 1
4 6 8
3 6 5 9
4 8 5
2 9
2 8 1 6 4
Hard #7
7 9 4 6 2 3
2 3 1 7 9 8
4
6 4 3
5 1
6
3 2 5 7
7 1 3
5 6 8
Hard #8
5 8 3 6
7 4 9
7 2
6 5 2 1
9 8 3 5 6
4 2 1 9 7
8 7 4
3
3 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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