Girandola is an ordinary sudoku with one extra group of cells. This group must also contain digits 1 through 9. (Girandola is a kind of revolving firework.)
Diagonal Sudoku Rule: Sudoku main diagonals also contain the digits 1 through 9.
Girandola Sudoku, also known as Extra Region Sudoku, is a variant of the classic Sudoku puzzle that introduces an additional group of cells that must also contain the digits 1 to 9 without repetition.
Diagonal Girandola Sudoku = Diagonal Sudoku + Girandola Sudoku