My attention has been drawn to this curious book, in which mariners have to solve exercises whose results become the clues in a sudoku puzzle. The only problem, the resulting puzzles usually have multiple solutions
Regards,
Mike
+---+---+---+
|...|.49|581|
|...|...|...|
|149|568|...|
+---+---+---+
|...|...|...|
|...|.51|248|
|.13|824|9..|
+---+---+---+
|672|48.|...|
|...|...|...|
|...|132|67.|
+---+---+---+ 34 sol.