"rigged" finger picker

If you want to quickly know what I want, search for "Chwazi Finger Chooser" within google's android playstore. Here are the requirments : 1) it MUST look identical (if I run your app on a phone and Chwazi on another phone next to it, I can't tell which one is the original). You need to pay close attention to the detail (animation, sounds, vibration, behavior of the program like the amount of time it takes to pick the winner 2) if it saves you time and allows you to charge cheaper, you can remove the group feature (I don't need it) and you can make it work for 1 to 6 fingers 3) rather than picking a finger randomly like Chwazi does, I want the finger closest to the top left position x,y (0,0) to win