It could have been named “Son of DoubleDoku” or “2 Double 2 Doku” or even “DoubleDoku: Folie à Deux,” but whatever it’s called, it’s a sequel to DoubleDoku.
Rules:
Normal Gattai-2 rules apply. That is, there are two overlapping 9x9 Sudoku grids. Within each Sudoku grid, each row, column, and 3x3 box contains the digits 1-9. The four boxes at the center are part of both grids.
Digits in cages do not repeat, and sum to the small number in the top left corner of that cage.
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: 1.5 out of 5
Solve on SudokuPad