One of the problems with Odd/Even Sudoku is that I can never remember which of squares/circles is supposed to be odd and which is supposed to be even. Here's a puzzle I wrote which solves that problem.
Rules
Place a number from 1 to 9 into each empty cell so that every row, column, and bold-outlined region contains every number exactly once. Cells marked with a grey circle must contain odd numbers, and cells marked with a grey square must contain even numbers.
Difficulty: 4/10
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