Rock Paper Scissors - Standalone

A friend wanted to create a 1 button game, and I suggested making rock paper scissors using the scroll wheel to select and scroll wheel down to confirm.The only issue we came across was, how can we have 2 people with 1 screen play this game? Well, what if we used sounds and didnt visually show the selections?I guess it can be considered 2 button, but for the sake of this, I count it as 1.Ofcourse this requires 2 people to be at the same computer, so sorry solo players :(It plays a sound whenever...