Printable Hard Sudoku

Set 4ma2j4. 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
2
5 1 4
7 3 8 2
9 3
2 3 1 7
3 8
7 9
9 5 6 1 4 7
6 4 7 5 2
Hard #2
9 4 3 2
7 2 5 6
4 7 9
1 4 2
7 4 8 5
2 6 8 9
3 1 4
3 1
5 2
Hard #3
9
4 3 7
7 1 5 6 9
4 6 7
9 8
3 5 2 1
6 7 8 9
5 1 7 8
9 8 5
Hard #4
1 3 9 6
5 6 9
8 9 3 4
5 9 4
2 4 1 7 9
1 4 2
7 2 3
2 1
8 7
Hard #5
4 9 8
8 7 9
6 4 7
7 6
5 4 8
3 6 9 5 1
8 3 2 1
6 1
2 7 8 4
Hard #6
3 8 9 4 5
4 5 3
5 8 6 1
6 3 9
2
5 6 7
8 9 5
1 5 4 9 7
2 4
Hard #7
6
7 8 6 9
9 2 7 3 8
6 1 3
5 2 3 4
2 8 4 6
5 8
8 4
6 4 5 2
Hard #8
1 3
3 7 1
6 4 5
4 3 9
7 2 1
8 7 3 4 2
4 2 1
6 8 5 9
9 3 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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