Program.cs

using System;
using Point = System.ValueTuple<int, int>;

Exception? exception = null;

try
{
	const int drawingWidth = 11;
	const int drawingHeight = 11;
	Point origin = (drawingHeight / 2, drawingWidth / 2);
	(int Height, int Width)? previousConsoleSize = null;

	Console.Clear();
Reset:
	Point cursor = origin;
	bool[,] currentDrawing = new bool[drawingHeight, drawingWidth];
	bool[,] goalDrawing = GenerateRandomDrawing();
	while (DrawingsMatch())
	{
		goalDrawing = GenerateRandomDrawing();
	}
	while (!DrawingsMatch())
	{
		(int Height, int Width) currentConsoleSize = (Console.WindowHeight, Console.WindowWidth);
		if (currentConsoleSize != previousConsoleSize)
		{
			Console.Clear();
			previousConsoleSize = currentConsoleSize;
		}
		Render();
		Console.WriteLine("""

			  Make the left drawing match the right drawing.
			  Use the arrow keys or WASD to draw.           
			  Use [end] or [home] to generate a new drawing.
			""");
		Console.SetCursorPosition(cursor.Item2 + 3, cursor.Item1 + 4);
	GetInput:
		Console.CursorVisible = true;
		switch (Console.ReadKey(true).Key)
		{
			case ConsoleKey.UpArrow    or ConsoleKey.W: cursor.Item1--; break;
			case ConsoleKey.LeftArrow  or ConsoleKey.A: cursor.Item2--; break;
			case ConsoleKey.DownArrow  or ConsoleKey.S: cursor.Item1++; break;
			case ConsoleKey.RightArrow or ConsoleKey.D: cursor.Item2++; break;
			case ConsoleKey.Home or ConsoleKey.End: goto Reset;
			case ConsoleKey.Escape: return;
			default: goto GetInput;
		}
		switch (cursor)
		{
			case ( < 0, _):             cursor.Item1 = 0; break;
			case ( >= drawingHeight, _): cursor.Item1 = drawingHeight - 1; break;
			case (_, < 0):              cursor.Item2 = 0; break;
			case (_, >= drawingWidth):   cursor.Item2 = drawingWidth - 1; break;
			default:
				currentDrawing[cursor.Item1, cursor.Item2] = !currentDrawing[cursor.Item1, cursor.Item2];
				break;
		}
	}
	Render();
	Console.WriteLine("""

		  **********************************************
		           You matched the drawings!!!          
		       Play again [enter] or quit [escape]?     
		""");
GetEnterOrEscape:
	Console.CursorVisible = false;
	switch (Console.ReadKey(true).Key)
	{
		case ConsoleKey.Enter: goto Reset;
		case ConsoleKey.Escape: return;
		default: goto GetEnterOrEscape;
	}

	bool DrawingsMatch()
	{
		for (int h = 0; h < drawingHeight; h++)
		{
			for (int w = 0; w < drawingWidth; w++)
			{
				if (currentDrawing[h, w] != goalDrawing[h, w])
				{
					return false;
				}
			}
		}
		return true;
	}

	void Render()
	{
		string horizontal = new('═', drawingWidth / 2);
		Console.SetCursorPosition(0, 0);
		Console.WriteLine();
		Console.WriteLine("  Draw");
		Console.WriteLine();
		Console.WriteLine("  ╔" + horizontal + "╬" + horizontal + "╗ ╔" + horizontal + "╬" + horizontal + "╗");
		for (int h = 0; h < drawingHeight; h++)
		{
			Console.Write(h == drawingHeight / 2 ? "  ╬" : "  ║");
			for (int w = 0; w < drawingWidth; w++)
			{
				Console.Write(currentDrawing[h, w] ? '█' : '.');
			}
			Console.Write(h == drawingHeight / 2 ? "╬ ╬" : "║ ║");
			for (int w = 0; w < drawingWidth; w++)
			{
				Console.Write(goalDrawing[h, w] ? '█' : '.');
			}
			Console.WriteLine(h == drawingHeight / 2 ? "╬" : "║");
		}
		Console.WriteLine("  ╚" + horizontal + "╬" + horizontal + "╝ ╚" + horizontal + "╬" + horizontal + "╝");
	}

	bool[,] GenerateRandomDrawing()
	{
		bool[,] drawing = new bool[drawingHeight, drawingWidth];
		int points = Random.Shared.Next(3, 12);
		Point a = origin;
		for (int i = 0; i < points; i++)
		{
			Point b = new(
				Random.Shared.Next(drawingHeight),
				Random.Shared.Next(drawingWidth));
			DrawLine(a, b);
			drawing[b.Item1, b.Item2] = false;
			a = b;
		}
		DrawLine(a, origin);
		return drawing;

		void DrawLine(Point a, Point b)
		{
			while (a != b)
			{
				if (Math.Abs(a.Item1 - b.Item1) > Math.Abs(a.Item2 - b.Item2))
				{
					a.Item1 = a.Item1 > b.Item1 ? a.Item1 - 1 : a.Item1 + 1;
				}
				else
				{
					a.Item2 = a.Item2 > b.Item2 ? a.Item2 - 1 : a.Item2 + 1;
				}
				drawing[a.Item1, a.Item2] = !drawing[a.Item1, a.Item2];
			}
		}
	}
}
catch (Exception e)
{
	exception = e;
	throw;
}
finally
{
	Console.CursorVisible = true;
	Console.Clear();
	Console.WriteLine(exception?.ToString() ?? "Draw was closed.");
}