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