Sudoku 6x6 java

private boolean solve(int[][] board) {
    for (int row = BOARD_START_INDEX; row < BOARD_SIZE; row++) {
        for (int column = BOARD_START_INDEX; column < BOARD_SIZE; column++) {
            if (board[row][column] == NO_VALUE) {
                for (int k = MIN_VALUE; k <= MAX_VALUE; k++) {
                    board[row][column] = k;
                    if (isValid(board, row, column) && solve(board)) {
                        return true;
                    }
                    board[row][column] = NO_VALUE;
                }
                return false;
            }
        }
    }
    return true;
}

Source: baeldung.com

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