Here we go… another “classic” Sudoku that I can’t remember posting before.
Twodoku is a Gattai-2 puzzle, which means that there are two overlapping Sudokus. It’s a tough one, I think. In order to solve it, you should use all classic Sudoku solving techniques, but it would help if you also knew how to apply the Twin Nonets technique.
TwoDoku: Gattai 2 Sudoku Variant Puzzle
Difficulty: IQ