The Odd/Even variant lets you realise some ideas that are difficult to put into a classic without overcluing. The break-in to this puzzle is a variation on a well-known classic technique that twists the geometry somewhat.
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: 8/10
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