Kazaguruma ("Windmill Sudoku") consists of five grids, one in the center and the other 4 overlapping the central one. This means that the numbers must be placed correctly for all the five puzzle squares.
Kazaguruma Sudoku, also known as Windmill Sudoku, is a variation of the classic Sudoku puzzle. It features five overlapping 9x9 Sudoku grids arranged in a windmill-like pattern.