Detective Work 1. Implement a start/stop mechanism for the app. (Hint: The Timer class includes acancel() method.)
2. Force the game to end after 30 seconds, and inform the user that the game has ended.
3. Devise a way for users to select a difficulty level. You might want to give them the options Easy, Medium, and Hard. You need to determine what defines the level of difficulty. You might increase the speed at which the dot moves, make the dot smaller, and so forth.