Printable Hard Sudoku

Set 626him. 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 5 4
3 6 2 4 1
7 1 5
4 2 9
9 3 6
8 3 4 5
1 2 8 9
2
5 7 6
Hard #2
8 7 9 4
7 6 8
1 2 5 3
3 1 5
7 9 3
4 1 6
1 6 4
7 9 1 8
2 4
Hard #3
7 8 1
3 6 2
1 2 4
6 3
8 7 3
3 4 5 6
6 8 3
1 5 7 9 4
7 6 5
Hard #4
9 8 4 2 6 3 5
5 6
4 7 8
1 5 9
4 7
3 2 8 5
1
7
8 1 9 4 6 2
Hard #5
4 9 8
2 7 3 8 1 4
1 9 2
7 2
3 5 1
5 9 3 8
9 4 1 5
1 5
2 6
Hard #6
1 8 2
3 2 4
6 7
5 9 4
7 4 3
3 7 2 6 9
9 5
1 5
5 4 6 8 1 3
Hard #7
5 4 2 7
2 4
4 7 3
1 2 7
7 4 6 8 1
9
6 4 1 7 5
8 3
5 9 8 6
Hard #8
2 4
8 6 9
1 9 2 3
5 6 7 4 1 8
7 2 6 3
9 2
3 6 9
5 8 6 7
8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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