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Sudoku Puzzles Level 9

LEVEL 9

x x x x x 9 x x x	x 9 1 x x x x x 4	6 x x x x 4 x 7 2
x 8 2 x 6 x 3 x 5	3 x 5 x x x x x x	x x x x 8 x x x 9
x x x x 2 6 x x 8	5 6 x x x 9 x x x	x x x x x x 2 5 x

3 x 3

x x 7 x x x x 1 2	9 8 2 3 x 1 x x 7	x x 4 x 6 x x 3 x
4 x x 1 8 x x x 5	x x 9 x x x x x 8	x x x x 2 x 9 4 1
x x 1 2 x x x x x	7 x 6 x x x x x x	2 x 5 4 7 3 1 x 6

2 x 3

x x x x x 2	x x 6 5 x x	x 3 6 6 x x
x x 4 x 5 3	x x x x x 2	x x 1 x 6 1

2 x 3

x x x x x 2	x x 6 5 x x	x 3 6 6 x x
x x 4 x 5 x	x x x x x 2	x x 1 x 6 1

2 x 3

x x x x x 2	x x 6 5 x x	x 3 6 6 x x
x x 4 x 5 x	x x x x x 2	x x 1 x x 1

2 x 3

x x x x x 2	x x 6 5 x x	x 3 x 6 x x
x x 4 x 5 x	x x x x x 2	x x 1 x x 1

2 x 3

1 x x x x x	x x x 5 x x	x x 6 x x x
x x 4 x x 3	1 x x x x 2	6 x x 4 6 x

2 x 3

x x x x 1 x	3 x x 5 x x	4 x 6 x x x
x x x x x 3	1 x x x 5 x	x x x 4 x x

2 x 3

1 2 x x x x	x x x x x x	4 x 6 x 2 x
x x 4 2 x 3	x 3 x x x x	x x x 4 6 x

2 x 3

1 2 x x x x	x x x x x x	4 x 6 x 2 4
x x 4 2 x 3	x 3 x x x x	x x x 4 6 x

2 x 3

1 2 x x x 2	x x x x x x	4 x 6 x x 4
x x 4 2 x 3	x 3 x x x x	x x x 4 6 x

2 x 3

1 2 x x x 2	x x x x x x	4 x 6 x x x
x x 4 2 x 3	x 3 x x x x	x x x 4 6 x

2 x 3

1 2 x x x 2	x x x x x x	4 x 6 x 2 x
x x 4 2 x 3	x 3 x x x x	x x x 4 6 x

2 x 3

1 2 x x x 2	x x x x x x	4 x 6 x 2 x
x x 4 x x 3	x 3 x x x x	x x x 4 6 x

2 x 3

1 2 x x x 2	x x x x x x	4 x 6 x 2 4
x x 4 2 x 3	x 3 x x x x	x x x 4 6 x

2 x 3

1 2 x x x 2	x x x x x x	4 x 6 x 2 4
x x 4 x x 3	x 3 x x x x	x x x 4 6 x

2 x 3

1 2 x x x x	x x x x x x	4 3 x x x 4
x 6 x 2 x 3	x x x x x x	x x x 4 6 x

2 x 3

1 2 x x x x	x x x x x x	4 3 x x x 4
x 6 4 2 x 3	x x x x x x	x x x 4 6 x

2 x 3

1 2 x x x x	x x x x x x	4 3 6 x x 4
x 6 x 2 x 3	x x x x x x	x x x 4 6 x

2 x 3

1 2 x x x x	x x x x x x	4 3 6 x x 4
x 6 x 2 x 3	x x x x x x	x x x 4 x x

2 x 3

1 2 x x x x	x x x x x x	4 3 6 x x 4
x 6 4 2 x 3	x x x x x x	x x x 4 6 x

2 x 3

1 2 x x x x	x x x x x x	4 3 6 x x 4
x 6 4 2 x 3	x x x x x x	x x x 4 x x

2 x 3

1 2 x x x x	x x x x x x	x 3 x x x 4
x 6 4 2 x 3	x x x x x x	x x x 4 6 x

2 x 3

1 2 x x x x	x x x x x x	x 3 6 x x 4
x 6 4 2 x 3	x x x x x x	x x x 4 6 x

2 x 3

1 2 x x x x	x x x x x x	x 3 6 x x 4
x 6 4 2 x 3	x x x x x x	x x x 4 x x

Make your own

2 x 2

x x x x	x x x x
x x x x	x x x x

2 x 3

x x x x x x	x x x x x x	x x x x x x
x x x x x x	x x x x x x	x x x x x x

3 x 3

x x x x x x x x x	x x x x x x x x x	x x x x x x x x x
x x x x x x x x x	x x x x x x x x x	x x x x x x x x x
x x x x x x x x x	x x x x x x x x x	x x x x x x x x x

Note that the difficulty level above 10 here means that's how hard it was to decide there was a single solution. When deciding which of 2 values can occupy one cell, you may find that choosing the first value yields a solution, but trying the second value may force you to try all values in yet another cell before deciding the second value doesn't yield a solution at all.
In other words, knowing there's just one unique solution may make the puzzle easier to solve than what the computer goes through to make sure it's unique.

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