Sudoku-X and “Killer Cages” go back more than 30 years, but I’m not sure when Odd & Even showed up.
Well-placed circles and squares can knock out four or five candidates from a cell, and that’s without even considering how many of each belong in a given row, column, or box.
Rules:
Normal Sudoku rules apply.
Digits within cages sum to the total in the top-left corner of the cage.
Digits in cells marked with a green square are even.
Digits in cells marked with an orange circle are odd.
The marked diagonals each contain the digits 1 to 9 exactly once.
Estimated difficulty: 1 out of 5
Solve on SudokuPad