Printable Hard Sudoku

Set 2tc1i6. 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
9
6 9 3
3 8 6 1
4 3 2 6 5
6 3 1 8
9 5 7
7 3 8
5 4 6 7
2 1
Hard #2
7 1
8 5 7
8 4 2 6 1
2 9 3 6
6 8 2 9
8
7 8 5 2
2 3 8
5 3 9
Hard #3
4 6 3 7
6 8 2
7 8
1 4 8 2
5 1 9
3 7
9 4 2 5
9 1 3 6
6 2 1
Hard #4
4 7
8 3 7 2
3 2 8
7 1
7 5 3 8 2
4
7 3 2 6 8 4
9 8 5
5 6 3
Hard #5
2 3 9
5 7 4
3 6 8 7 5
2 6 5
3 5 7 9 4 6
1 8
9 3 6 7
9
2 4
Hard #6
5 7 2 1
3 9
7 1
4 3 2
2 8 5 1 7
4 5 8
1 6 4
9 2 8
3 1 7 2
Hard #7
6 4 8 1
2 7 9 6
5 9 2
7 9 2 3 1
4 7 6 9
8 3 6
9
5
8 6 7 4
Hard #8
9 6 4
8 5
6 1 8 2
9 2 4 8
8 7 9 1 6
6 7
1 6 3 9
3 8 6
7 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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