Goof Ball is a two player game that only requires a single iPhone.
Gameplay is head to head.
One player is red the other is green.
The objective is to collect 10 of the appropriate colored balls before your opponent.
You may only collect balls that are on your side of the field.
However, there is a small unmarked neutral zone where any ball may be collected by any player. If a red player collects a green ball the green player gets the point and vice verse.
This is a great game for kids, my four year old cannot get enough of it.