An even dozen regions for the price of nine! 33% more, such a deal! Unless you count each row and each column as a region, in which case it’s only 11% more. But still: three extra regions for the low, low price of your time!
Rules:
Normal Sudoku rules apply.
There are three additional regions marked in blue. Each also contains the digits 1 through 9.
Cells separated by a white dot contain consecutive digits. In cells separated by a black dot, one digit is double the other. Not all possible dots are given.
Estimated difficulty: 1 out of 5
Solve on SudokuPad