Board.groovy

class Board {
    Integer[][] sample = [
            [0, 0, 0, 0, 0, 2, 0, 0, 3],
            [6, 0, 0, 0, 3, 0, 0, 0, 9],
            [9, 0, 0, 0, 0, 0, 0, 0, 0],
            [0, 4, 5, 0, 0, 0, 6, 0, 0],
            [8, 0, 0, 6, 0, 0, 3, 0, 7],
            [0, 0, 0, 0, 0, 0, 8, 5, 2],
            [4, 9, 0, 0, 6, 3, 0, 0, 5],
            [0, 3, 0, 5, 0, 8, 0, 0, 0],
            [0, 0, 0, 4, 9, 0, 0, 0, 0]
    ]

    Cell[][] board = new Cell[9][9]

    Board() {
        for (int i = 0; i < sample.length; i++) {
            for (int j = 0; j < sample[i].length; j++) {
                board[i][j] = new Cell(value: sample[i][j])
            }
        }
    }
}