I was first introduced to Sudoku by a work colleague back in 2005 around the time when Sudoku was becoming an international sensation. At first it didn’t really catch my interest, however this all changed a few years later when my daily commute more than tripled in time and I was looking for ways to lessen the boredom. The rest, as they say, is history…

Most people are familiar with the traditional 9×9 Sudoku puzzle, but there are also many different variations that include different styles (Jigsaw, Killer, …) and sizes (4*4, 6*6, …).

The following are examples of some of these variants…

Standard Sudoku

 Jigsaw Sudoku

Killer Sudoku

 Hyper / Centre-Dot / Asterix / Offset

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