Printable Hard Sudoku

Set oahn63. 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
4 3 9 7
4
7 5 9
5 3 4 7 1
8 2
1 3 9 8
2 6 5 9
5 9 6 3
3 5
Hard #2
4 9 8 6 7 1 3
7 1 3
1 8 6
1 7
7 4 3
2 5
2 4
1 4 8 9
8 5 7
Hard #3
4 6 2 8
2 4 1 7
3 9 5
3
4 2
5 3 8 6 9
6 9 3 2
1 6
4 8 9 6
Hard #4
6 9
6 2 9 4
8 4 7 5
6 4 7 1
9 8 4 6
7 2
2 1 5
9 1 6 8
7 3
Hard #5
8 4
5 2 1 6
4 3
4 7 1
1 9 2 3 4
6 4 1 8
8 6 4
2 6 7 4
7 9
Hard #6
1 5
3 8
9 1 7 8
3 5
9 4 2 1
5 7 6 9 4 2
2 3 6 7
2 1 9 5
2
Hard #7
6 1 4
8 3
7 3 2 5
7 3 8
3 5 6 7
5 4 6 3
1 6 8 9 4 7
8 4
9
Hard #8
8 4 7 2
3 1 4 8 5
5 4
6 5 2 9
9 6 7
3 9 1
4
3 4 8 1 5
9 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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