My first full-size sudoku puzzle. Partially inspired by Parity Islands by yttrio.
The parity rule may take some time to figure out, and even then the logic isn't easy (but hopefully fair). Enjoy!
Rules
Classic Sudoku rules apply.
Each digit is orthogonally adjacent to at most one greater digit of the same parity as itself, and to at most one smaller digit of the same parity as itself. E.g. a 5 can't be adjacent to both a 7 and a 9, or two 3s, but can be adjacent to a 3 and a 7.
Difficulty (select to make visible): ★★★⯪☆
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