Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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