Printable Hard Sudoku

Set 13j0t4w. 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
7
7 2
6 9 4 1 8
9 1 8 3 6 2 4
2 3 9 7
5 7 2
9 1
8 5
1 6 9
Hard #2
7
4 6
7 8 6 1
9 6 8
5 2
5 1 2 9 3
2 4 6 3
3 4 6 1
6 2 3 4
Hard #3
2 3
8 7 9 1 2
4
7
4 2 8 5 6 9 3
6 2
3 7
2 5 9 4 8
7 8 5 9
Hard #4
6 4 2
5 9
3 8 9 2 1
8 3 7 6
6 4 3 5
5 8 7
2 9 5
1 6 3 2
3
Hard #5
1 8 2
9 3 4
8 2 4
8 5 2 6
4 9 5
5 7 4 8
3 2
5 2 8
3 6 1 7
Hard #6
6 2 9 7 1
1 8 6 9
9 8 1
4 7 5
3 1
9 1
2 3 7
8 5 1 2
4 3 5
Hard #7
1 3
9 8 7 5
3 4 8 1
5 9 6 3 8
3 2
1
2
7 5 9 3 1
6 1 5 4 8
Hard #8
9 8 1
5 4 3
9 6 4
9 7 3 1
6 5 3
4 3 7 5
1 6 7 2
8 7
5 4 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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