C#

There is an implementation of the game, you need to roll back the previous move, choose the level of complexity (the size of the playing field 3x3, 4x4), using the Singleton patterns, Factory method, Command, Memento, help.

<pre>using System;

//Game.cs
namespace puzzle15
{
    class Points
    {
        public readonly int x, y;
        public Points(int x, int y)
        {
            this.x = x;
            this.y = y;
        }
    }
    class Game
    {
        public int Length=0;
        const int nw = 4, height = 4;
        int[,] field = new int[nw, height];
        Points[] FieldValue = new Points[16];


        public Game(int[] point)
        { 

            int r = 0;
            string[] file = new string[4];
            Length = 16;

            mixer(point);

            for (int j = 0; j < height; j++)
            {
                for (int i = 0; i < nw; i++)
                {
                    field[j, i] = point[r];
                    FieldValue[point[r]] = new Points(j, i);
                    r++;

                }
            }

        }

        public void mixer(int[] p)
        {

            int tmp = 0;

            Random rnd = new Random();

            for (int i = 0; i < 16; i++)
            {
                bool isExist = false;
                do
                {
                    isExist = false;
                    tmp = rnd.Next(0, 16);
                    for (int j = 0; j < i; j++)
                    {
                        if (tmp == p[j]) { isExist = true; }
                    }
                }
                while (isExist);
                p[i] = tmp;
            }
        }

        private Points GetLocation(int value)
        {

            return FieldValue[value];
        }


        public void drawField()
        {

            Console.WriteLine("----------------------------");
            for (int i = 0; i < nw; i++)
            {
                for (int j = 0; j < height; j++)
                {
                    Console.Write(field[i, j] + "\t");

                }
                Console.WriteLine();

            }

            Console.WriteLine("----------------------------");

        }

        public bool repeat(double Length,int[] point)
        {

            for (int i = 0; i < Length; ++i)
            {
                for (int y = i + 1; y < Length; ++y)
                {
                    if (point[i] == point[y])
                    {
                        Console.WriteLine(point[i] + " ==" + point[y]);
                        throw new ArgumentException("Numbers should not be repeated");
                    }


                }
            }
            return true;
        }

        public Boolean finish()
        {
            bool temp = false;
            int value = 1;
            for (int i = 0; i < nw; ++i)
            {
                for (int j = 0; j < height; ++j)
                {
                    if (field[i, j] == value)
                    {

                        temp = true;
                        ++value;
                        if (value == Length)
                        {
                            value = 0;
                        }
                    }
                    else
                    {
                        return false;
                    }

                }

            }      
            return temp;

        }

        public void Move(int value)
        {

            try
            {
            Console.WriteLine(value);
            if (value > 15 || value < 0)
            {
                throw new ArgumentException();
            }

            int x = GetLocation(0).x;
            int y = GetLocation(0).y;

            int ValueX = GetLocation(value).x;
            int ValueY = GetLocation(value).y;

                if ((ValueX == x && (ValueY == y - 1 || ValueY == y + 1))||(ValueY == y && (ValueX == x - 1 || ValueX == x + 1)))
                {

                    field[x, y] = value;
                    field[ValueX, ValueY] = 0;

                    var vere = FieldValue[0];
                    FieldValue[0] = FieldValue[value];
                    FieldValue[value] = vere;
                }

            }

            catch (ArgumentException)
            {
                Console.WriteLine("There is no such number, try again: ");
            }
            catch (Exception)
            {
                Console.WriteLine("Next to this number is not 0, try again: ");
            }

        }

    }


    //--------------------------------------------------------------------------------------------------------------------------------------------------------


    class Points2
    {
       ..............................................................................................
    }
    class Game2
    {
        public int Length = 0;
        const int nw = 3, height = 3;
        int[,] field = new int[nw, height];
        Points[] FieldValue = new Points[9];


        public Game2(int[] point)
        {

            int r = 0;
            string[] file = new string[3];
            Length = 9;

            mixer(point);

            for (int j = 0; j < height; j++)
            {
                for (int i = 0; i < nw; i++)
                {
                    field[j, i] = point[r];
                    FieldValue[point[r]] = new Points(j, i);
                    r++;

                }
            }

        }

       .................................................................................................

    }

}


//Program.cs
using System;
using System.Collections.Generic;


namespace puzzle15
...............................................................................................

//code begin memento
    class GameHistory
    {
        public Stack<Game> History { get; private set; }
        public GameHistory()
        {
            History = new Stack<Game>();
        }
    }


}

WebRequest request = WebRequest.Create(endpointUrl + txn);
WebResponse response = request.GetResponse();
Console.WriteLine(response.ResponseUri);

private void Form1_Load(object sender, EventArgs e)
       {
          string img = @"D:\Capture1.PNG";
          Bitmap bmp = new Bitmap(img);
          pictureBox1.Image = Image.FromFile(img);
          int w = bmp.Width;
          int h = bmp.Height;

          int f = 1;
          Random rr = new Random();
           for (int y=0;y < h ; y++)
           {
               for (int x=0 ; x < w ; x++)
               {

                   int a = rr.Next(256);
                   int r = rr.Next(256);
                   int g = rr.Next(256);
                   int b = rr.Next(256);

                   bmp.SetPixel(x, y, Color.FromArgb(a, r, g, b));


               }
           }
           pictureBox2.Image =bmp;
         }