It was a bit of trouble thinking of a nice opening, but I think this way works well. I figured out a few different openings, but this was the first I came up with. At the start I thought I would need a lot of clues to get this puzzle to work. But as I got through the opening I noticed I would need a lot less clues than I had at first imagined. I liked how the neighbouring digits worked together with the second odd digit rule. I think this was my favourite puzzle to design in the series. I hope you enjoy it too.
Rules for Sudoku
In this Sudoku digits on the outside indicate the direct neighbours off the second odd digit in that row or column, when looking from that side.
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