Samurai Sudoku is a variant formed by the overlapping of five 9x9 sudoku puzzles. The central sudoku shares 4 of its sub-grids with the outer sudokus by overlapping at the corners. The goal is the same: to fill all the 9x9 grids by applying the classic rules and make it so all the cells contain a digit from 1 to 9 without repeating any number within the same row, column, or sub-grid.