Printable Hard Sudoku

Set 150r3sm. 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 2
5 2 6 4 1
9 3 2 5
3 9 1 4 8
2 1 7
7 9
4 7 9
8 4 5
5 1
Hard #2
4 3 2 6 9
3 5 8
8 1
7 9 3 4 5
6 7 1
2
5 3 4 2
2 1 8
2 9 1
Hard #3
6 1
1 5 6 9
3
2 5 7 3 9
3 9 8 7
4 5
9 5 2 4
8 4 7 6 3
1 5
Hard #4
7 3 1
3 9 4
5 6 7
8 4 3
6 2 5 4 8
6 2
3 2 1 5
8 5 2 9
7 4
Hard #5
3 4
6 7
2 3 1 6 5
7 3 9
1 7 5
3 1 2 4
9 4 7 2 6
1
6 5 9 7
Hard #6
2 3 7 8 6
9 4 7
4 7 9
3
1 9 8
8 7 2 5 3 1
3 6 2
5 1 3
7 4
Hard #7
6 1 3 2
8 5 7 9
2 7 8
9 4 3 1
7 9 3
8
6 8 5 1 7
9 6 8
2 9
Hard #8
2 3 4 9
3 6 4 2
9 5 8
3 8
2 3 1 4
7 2 3
6 7 4 9
1 5 6
1 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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