Finding an Image Inside Another Image

A better approach is to build a custom class which holds all the information you need instead of relying on the image itself.

For example:

public class MyTile
{
    public Bitmap TileBitmap;
    public Location CurrentPosition;
    public int Value;
}

This way you can "move around" the tile class and read the value from the Value field instead of analyzing the image. You just draw whatever image the class hold to the position it's currently holding.

You tiles can be held in an array like:

private list<MyTile> MyTiles = new list<MyTile>();

Extend class as needed (and remember to Dispose those images when they are no longer needed).

if you really want to see if there is an image inside the image, you can check out this extension I wrote for another post (although in VB code):
Vb.Net Check If Image Existing In Another Image

I'm answering my question since I've found the solution:

this worked out for me:

System.Drawing.Bitmap sourceImage = (Bitmap)Bitmap.FromFile(@"C:\SavedBMPs\1.jpg");
            System.Drawing.Bitmap template = (Bitmap)Bitmap.FromFile(@"C:\SavedBMPs\2.jpg");
            // create template matching algorithm's instance
            // (set similarity threshold to 92.5%)

           ExhaustiveTemplateMatching tm = new ExhaustiveTemplateMatching(0.921f);
                // find all matchings with specified above similarity

                TemplateMatch[] matchings = tm.ProcessImage(sourceImage, template);
                // highlight found matchings

           BitmapData data = sourceImage.LockBits(
                new Rectangle(0, 0, sourceImage.Width, sourceImage.Height),
                ImageLockMode.ReadWrite, sourceImage.PixelFormat);
            foreach (TemplateMatch m in matchings)
            {

                    Drawing.Rectangle(data, m.Rectangle, Color.White);

                MessageBox.Show(m.Rectangle.Location.ToString());
                // do something else with matching
            }
            sourceImage.UnlockBits(data);

The only problem was it was finding all (58) boxes for said game. But changing the value 0.921f to 0.98 made it perfect, i.e. it finds only the specified number's image (template)

Edit: I actually have to enter different similarity thresholds for different pictures. I found the optimized values by trying, in the end I have a function like

float getSimilarityThreshold(int number)