Ping Pong Game App. A retro ping pong game, Comp. vs. user, similar to http://www.twoplayergames.org/play/1003-Retro_Pong.html in Sprite kit. Two view, main and setting. Audio visual component is required, i.e., appropriate sound and appropriate visual presentation. A scoreboard is maintained. In setting side, ask user which ball to select (different color), what is the speed of the ball, size of paddles, etc.