Here another type of sudoku correction:

Turn 5 times a 3x3-box 90 degree to the left or right so that after that each row, column and 3x3-box has exactly one of each digit.

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Here another type of sudoku correction:

Turn 5 times a 3x3-box 90 degree to the left or right so that after that each row, column and 3x3-box has exactly one of each digit.

Turn 5 times a 3x3-box 90 degree to the left or right so that after that each row, column and 3x3-box has exactly one of each digit.

- Pyrrhon
**Posts:**240**Joined:**26 April 2006

Nice puzzle. Solution:

536472891

982615374

741983625

354167982

298534716

617829543

875246139

463791258

129358467

Turn b5 & b7 anti-clockwisely for 90 degrees, b6 clockwisely for 90 degrees, and b9 for 180 degrees (i.e. twice 90 degrees either way).

In case anybody need a hint:

The central cell of each block (i.e. r258c258) stay put. That restrict some blocks from turning 90 degrees once. Once you figure out which and how many blocks must turn 90 degrees once (or thrice) you'll know how many blocks must turn 180 degrees. And it's easy to check which blocks must not turn 180 degrees.

536472891

982615374

741983625

354167982

298534716

617829543

875246139

463791258

129358467

Turn b5 & b7 anti-clockwisely for 90 degrees, b6 clockwisely for 90 degrees, and b9 for 180 degrees (i.e. twice 90 degrees either way).

In case anybody need a hint:

The central cell of each block (i.e. r258c258) stay put. That restrict some blocks from turning 90 degrees once. Once you figure out which and how many blocks must turn 90 degrees once (or thrice) you'll know how many blocks must turn 180 degrees. And it's easy to check which blocks must not turn 180 degrees.

- udosuk
**Posts:**2698**Joined:**17 July 2005

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