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Tic-Tac-Toe Sudoku (951)
Instruction:
Apply classic sudoku rules. The central 3x3 region serves as a map to the 9 regions of the grid (for the example, its top-left cell corresponds to the top-left 3x3 region, and its central cell corresponds to the central 3x3 region). Wherever the central region contains an odd digit, the corresponding region must have three odd digits in at least one line (horizontal, vertical or diagonal). Wherever it contains an even digit, the corresponding region must have three even digits in a line. No region can contain both a line of odd digits and a line of even digits.