---

using System;
using System.Drawing;
using System.Windows.Forms;

namespace game99
{
    public partial class Form1 : Form
    {
        Button[,] buttons = new Button[10, 10];
        int emptyRow = 9;
        int emptyCol = 9;

        public Form1()
        {
            InitializeComponent();
            CreateGrid();
        }

        void CreateGrid()
        {
            int number = 1;
            int size = 50;

            for (int i = 0; i < 10; i++)
            {
                for (int j = 0; j < 10; j++)
                {
                    Button btn = new Button();
                    btn.Size = new Size(size, size);
                    btn.Location = new Point(j * size, i * size);

                    if (number <= 99)
                        btn.Text = number.ToString();
                    else
                        btn.Text = "";

                    btn.Click += Button_Click;

                    buttons[i, j] = btn;
                    this.Controls.Add(btn);

                    number++;
                }
            }
        }

        private void Button_Click(object sender, EventArgs e)
        {
            Button clicked = (Button)sender;

            for (int i = 0; i < 10; i++)
            {
                for (int j = 0; j < 10; j++)
                {
                    if (buttons[i, j] == clicked)
                    {
                        if (CanMove(i, j))
                        {
                            Move(i, j);
                        }
                    }
                }
            }
        }

        bool CanMove(int row, int col)
        {
            return (Math.Abs(row - emptyRow) == 1 && col == emptyCol) ||
                   (Math.Abs(col - emptyCol) == 1 && row == emptyRow);
        }

        void Move(int row, int col)
        {
            buttons[emptyRow, emptyCol].Text = buttons[row, col].Text;
            buttons[row, col].Text = "";

            emptyRow = row;
            emptyCol = col;
        }
    }
}