Remove controller name from url

You could try inverting the routes definition by placing the more specialized route first. Also, you probably didn't want to hardcode the action name as action but rather use the {action} placeholder:

public class RouteConfig
{
    public static void RegisterRoutes(RouteCollection routes)
    {
        routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
        //routes.MapMvcAttributeRoutes();

    routes.MapRoute(
        name: "Special",
        url: "{action}",
        defaults: new { controller = "Home", action = "LandingIndex" }
    );

    routes.MapRoute(
        name: "Default",
        url: "{controller}/{action}/{id}",
        defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
    );
   }
}