Recently, because I was learning Silverlight, I took it out and imitated that example to implement it. The code will be similar to the downloaded one, and I removed some unnecessary code. This picture is basically the same as the interface of the game I downloaded. I just made some minor changes in the XAML code. How to play the game: Click the red square with the mouse and then drag it to start the game. If you touch the blue square or the black panel, you lose. The longer you persist, the more powerful you will be.