It might be tempting to try to solve this using only the green lines, with the pair of odd and pair of even cells to close the deal. But let the odd and even cells remind you: this is a quadro puzzle. The 2x2 rule will help!
Rules:
Normal Sudoku rules apply.
Consecutive digits on solid green “whisper” lines differ by at least five.
Digits in cells marked with a green square are even.
Digits in cells marked with an orange circle are odd.
No 2x2 set of cells contains only odd or only even digits.
Estimated difficulty: 2 out of 5
Solve on SudokuPad