When first starting the design, I wasn't sure how to create a nice opening. I knew I had to have longer arrows to create an interesting puzzle as otherwise the possibilities in the circle would be too limited. After choosing this layout, I had a bit of trouble creating an opening. After a few tries, I had a nice opening. It wouldn't really become unique though. I could fix it with extra givens, but I'd rather not. When I added the arrow in the centre nonet, it allowed me to remove some givens to rework the end of the puzzle a bit. In the end this was the result and I think it's a nice solve. Enjoy.
Rules for Sudoku
In this Sudoku, a digit in a circle indicates the number of odd digits along its arrow.
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