Printable Hard Sudoku

Set 1p59rik. 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 3
6 2 5 7 8
3 5 1
4
9 6 5 8
3 4 8 6
7
9 1 5
8 6 7 2 9 4
Hard #2
6 8 3
5 3 1
9 4 6
8 1 4 7 5 9
4 7 9
2 5 8
7 8 6
2 3
6 9 8
Hard #3
8 4 9 1 7 5 2
1 6 7
3 9
6
3 4 1 2
2 4 8 3
5
4 8 9 3
1 6 8
Hard #4
5 7 9
2 3
4 1
2 4
3 2 4 5 6
5 4 8 7 9 3
1 5 6
7 3 8 2
8 7
Hard #5
2 4 6 8 3
2 7 1 9
9
1 6 3
9 6 1 5
5 3
3 8 5 1
1 2 3 4
4 2
Hard #6
2 3 9
2 6 3
8 6 4 2
7 8
4 7 9
5 6 3
4 8
6 3 8 1 5
1 4 9 7
Hard #7
8 2 3 4 1
9 3
3 9 2 5
9 8 6
6 4 1
3 5 1
5 1 2
3 6 1 8
4 9
Hard #8
6 5 1
8 3 2 7 5 9
9 4
7 2
6 5 8
7 5 3
2
3 6 4 7 8
4 8 3 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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