C#-Code

using System;
using static System.Console;
using System.Collections.Generic;
using System.Text;

namespace aufgabe_217_mastermind
{
    class Program
    {
        static void Main()
        {
            Random rand = new Random();
            bool bo_break = false;
            while (!bo_break)
            {
                Clear(); // = Console.Clear();
                int[] code = new int[] { rand.Next(6), rand.Next(6), rand.Next(6), rand.Next(6) };                
                int[] move = new int[4];
                Class_Mastermind cm = new Class_Mastermind(code);
                //Write(cm.getsecret());
                bool bo_game_runs = true;
                int counter = 0, max_counter = 10;
                bool bo_end1 = false;
                bool bo_end2 = false;
                while (bo_game_runs)
                {                    
                    bool bo_input_okay = false;
                    while (!bo_input_okay)
                    {
                        bo_input_okay = true;
                        Write($"give me your move (e.g. 0124 or 11 (is interpreted as 0011) or 0 (= 0000)): ");
                        int input;
                        bo_input_okay = int.TryParse(ReadLine(), out input);

                        for (var i = 0; i < move.Length; i++)
                        {
                            move[move.Length - 1 - i] = input % 10;
                            input /= 10;
                            if (move[i] > 5)
                                bo_input_okay = false;
                        }
                    }
                    counter++;
                    Clear();

                    bo_end1 = !cm.play(move);
                    bo_end2 = counter < max_counter;

                    bo_game_runs = bo_end1 && bo_end2;
                    Write(cm.movelist(bo_with_secret: false));
                }

                string info = "you have lost";
                if(!bo_end1)
                    info = "you have won";

                WriteLine($"game over: {info}{Environment.NewLine}code was {cm.getsecret()}");
                WriteLine("new game? (n = EXIT)");

                ConsoleKeyInfo ki = ReadKey(false);
                bo_break = ki.Key == ConsoleKey.N;
            }
        }
    }

    public class Class_Mastermind
    {
        int array_length;
        int[] secret;

        List<int[]> moves = new List<int[]>();

        public Class_Mastermind(int[] code)
        {
            this.array_length = code.Length;
            this.secret = new int[code.Length];
            code.CopyTo(this.secret, 0);
        }

        public bool play(int[] move)
        {
            bool bo_result = true;
            int[] temp = new int[array_length + 2];            
            for (var i = 0; i < move.Length; i++)
            {
                if (move[i] != secret[i])
                    bo_result = false;                
                temp[i + 1] = move[i];
            }
            int[] temp1 = number_of_black_and_white(secret, move);
            temp[0] = temp1[0];
            temp[temp.Length - 1] = temp1[1];
            moves.Add(temp);
            return bo_result; //true: game over
        }

        public string movelist(bool bo_with_secret = false)
        {
            StringBuilder sb = new StringBuilder();
            string sadd = string.Empty;
            for (var i = 0; i < moves.Count; i++)
            {
                if (bo_with_secret)
                    sadd = getsecret();
                sb.Append(sadd + $"{moves[i][0], 2} :");
                for (var j = 1; j < moves[i].Length - 1; j++)
                    sb.Append($"{moves[i][j], 2}");
                sb.AppendLine($" :{moves[i][moves[i].Length - 1], 2}");               
            }
            return sb.ToString();
        }

        public string getsecret()
        {
            StringBuilder sb = new StringBuilder("    ");
            for (var j = 0; j < secret.Length; j++)
                sb.Append($"{secret[j],2}");
            sb.AppendLine();
            return sb.ToString();
        }

        int[] number_of_black_and_white(int[] n, int[] ns) //according to DONALD E. KNUTH; n = code; ns = pattern
        {
            int[] result_ncode = new int[n.Length + 2];//total_number_of_hits
            int[] result_ntest = new int[ns.Length + 2];//total_number_of_misses
            int counter_black = 0;
            for (var i = 0; i < ns.Length; i++)
            {
                if (ns[i] == n[i])
                    counter_black++;

                result_ncode[ns[i]]++;
                result_ntest[n[i]]++;
            }

            int[] result = new int[2];
            for (var i = 0; i < this.array_length + 2; i++)
                result[0] += Math.Min(result_ncode[i], result_ntest[i]);
            result[1] = result[0] - counter_black;
            result[0] = counter_black;
            return result;
        }
    }
}