Printable Hard Sudoku

Set 1r5foe8. 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 7 1 4
1 9 8 5
9 3
2 9
9 3 4 5
8 2 1 4 6
6 9 3 7
5 8 2
2
Hard #2
7 9 8
7 4 9 1
1 2 8 7 4
4 8
3 5 2
9 6 8 2
9 7 2 1
2 5
4 6
Hard #3
2 8 6
5 9 8 7
5 3
7 3 9
2 1 7
9 8
3 7 8 6 1
8 5 2 7
8 5 2
Hard #4
7
2 1 6 4 7
8 5 7 1 3
3 1 9
1 2
4 9 3 8 7
2 3
8 9 4
6 1 4
Hard #5
5 6
2 6 4 1 9
3 4
8 4 7 9
6 5
9 6 7
2 5
9 5 8 7 3
4 1 5 8
Hard #6
8
5 6 3
4 3 7 5 2
5 7 6
8 2 4 1 7
4 3
5 6
3 7 1 8 4
9 8 3
Hard #7
5 8
4 3 2 6
4 7 9
7 1 5 2
2 3
3 8 4 7
2
9 5 3 2
8 6 3 2 5
Hard #8
7 9
4 1 9 6
7 3 5 4 8
1
7 9 6
4 3 9 7
1 6 5 2
7
9 8 3 5 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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