Some time ago I made this little app called GameCalculator. It can be used to calculate points at party games, like excellent 8Bit Nintendo Ice Hockey or Sega Megadrive Teenage Mutant Ninja Turtles III.
But mostly I did it to show off some nice UI animations 
(and to learn)
Android: https://play.google.com/store/apps/details?id=com.GameCalculator&hl=en
iOS: https://itunes.apple.com/us/app/gamecalculator/id952709405?mt=8