Printable Hard Sudoku

Set 155w2kr. 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
8 9 6
3 1
4 3 7 5
9 4 1 5
9 2 1
4 5 3 7
8 1 2 7
5 9 2 1 3
Hard #2
5 2 8 9
4 1
2 8 7 6
3 7
4 9 3
2 1 5 6 3
7 2
6 4 5
4 2 6 8
Hard #3
9 3 8 5
6 5 9
5 3 2 4 6
1 4
8 1 7
4 1 8
8 5 2
9 6 7
7 3 9
Hard #4
4 8 9 3
8
8 3 1 6 9
8 4 2 1 5
3
5 6 3 4
1 7 8 4
5
5 4 2 1
Hard #5
1 6
7 4 1 5 2
2 5 7 6
4 1 2
8 4 9
9 4 7 3 6
8 9
9 7
2 6 1
Hard #6
6 4 8 5
9
3 6 7 2
7 9 1 2 8
4 3 6 7 2
7 1
1 9 8
4 3 6
6 5
Hard #7
3 5 9
6 5 1 2
2 4 9 3
7 1
3 5 1 4
1 7 2
1 6
7 4 1 5
8 2 5
Hard #8
1 9 6 2 8
4 8 7
3
9 4 7 5 2 6
6 7 4 9
5 7
7 6
1 9 8
3 2 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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