RULES: Place a digit from 1 to 9 in each empty cell so that each digit appears exactly once in each row, column and 3x3 outlined box.
Cells containing grey circles contain only odd digits. Cells containing grey squares contain only even digits.
Hi all. It really feels great to reach 500 Sudokus on my blog. When I started the blog, I never imagined I would come this far. To celebra...
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