Each extra region is connected, even if only diagonally.

This one should be slightly easier than the last.

Rules:
Normal Sudoku rules apply.
There are two additional regions marked in blue. Each also contains the digits 1 through 9.
Digits in cells marked with an orange circle are odd.
Digits in cells marked with a green square are even.

Estimated difficulty: 1 out of 5

Solve on SudokuPad

Some puzzles include extra regions, but they’re usually square. Or diagonals, which are technically extra regions, and also straight lines. A nine-cell Renban line could be considered an extra region, and can be any arbitrary connected shape. These two regions are none of those.

Rules:
Normal Sudoku rules apply.
There are two additional regions marked in blue. Each also contains the digits 1 through 9.

Estimated difficulty: 2 out of 5

Solve on SudokuPad