Printable Hard Sudoku

Set 1ivxi8f. 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 4 6 8
4 1 6 9
9 7 4
9 1 3
7 5 4
8 3 4
6 5 7
1
9 7 1 4 5
Hard #2
9 1 3 4
4 5 2 1
8 2
6 4 1 5
2 9 1
3 6
1 9 6
3 6 2 7 9
8 2
Hard #3
7 3
6 5 4 8
2 9 1
7
9 3 8 4 5
3 4 6 2
2 6 8 9 4
4 8
3 7 6
Hard #4
8 1 6
6 3 4 1 9
9 6 2
6 8 5
1 4 7 5
5 8
1 7 3 8
7 4 1
4 9
Hard #5
5
3 5 2 8 6 1
9 7 3 5
9 8
9 4 8 1 6
6 3
7 5 2
4 8
3 6 4 9
Hard #6
3 7
3 4
5 6
5 4 1 8 6 9
2 8
9 5 2 8
9 1 4 2
7 2 5
8 9 2 7
Hard #7
8 9
5 1 7
9 6 2
4 8 6 3 2
6 4
9 1
8 5 6
7 8 5
5 2 9 6 8 7
Hard #8
5 2 1 6 7
3 5 6 1
9 6 4 7 2
6 4
1 2 3
9 6 7
3 9
5 1 2
4 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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