C sharp - Codigo del juego picas y fijas

using System;

using System.Threading;

using System.Collections.Generic;

using System.Text.RegularExpressions;

using System.Globalization;

namespace proyecto_final

{

    class Program

    {

        static void ranking(string name, TimeSpan duracion)

        {

            Console.WriteLine("{0}, your score is {1}", name, duracion.Seconds);

        }

        // Function to test numbers repeat.

        static bool Test(int num)

        {

            string S = num.ToString("D4");

            for (int i = 0; i < S.Length; i++)

                for (int j = 0; j < S.Length; j++)

                    if (i != j)

                        if (S[i] == S[j])

                            return false;

            return true;

        }