Printable Hard Sudoku

Set 1goif99. 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
2 8 3 6
3 6
7 2 8
2 7 6 8 5 3
5 3 2
4 9 2
8 9 5 1
3 9 7
Hard #2
8 5 3 9
5 7 4
6 1 2 8
9 3 7 1 8
3 7
6 3 9
7 8 3 9 1
1
4 5
Hard #3
5 7 6
9 4
1 2 3 6
6 3 1 7 9
1 2
2 6 9 4
2 4 5 8
4
4 2 3 1
Hard #4
1 6 8 3
5 4 2
2 7 3 6
5 3 8 2
3 4 9 5
6 8
9 5 1 4
4 8 3
6
Hard #5
2 8
6 9 1
3 1 8 6 2 5 9
2 1 8
7 4 6
3 5
7 6 4
5 4 3 2 8
5
Hard #6
6 1 2
5 8 2 1 3
2 7 9
6 4 9 1
2
7 1 6 5
5 8 4 7
9 6
4 2 9
Hard #7
1 7 5
5 6 1 2
5 2 6
1 3 6 4
7
6 4 8 3
9
8 4 1 2 7
5 7 8 4
Hard #8
1 9 4
4 9 2 7
8 1 7 5
7 1 5 4
6 2
2 8 1
2 3
4 2 8
6 4 1 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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