This is the very first and very basic version of the card game stress. Each player can play any of his cards that is either one higher or one lower than one in the center stacks. 1 can be put on 13 and vice versa. Who finishes his card stack first wins the Game.
The app was an 8h test balloon that never got much more love than that. Maybe it will be revisited at some point.
Update: FC fixed, winner announce