2 Player,   VR,   Kinect  or Neuron or Ximmersion

Non-verbal communication for international/global studies or perhaps social interaction training [possibly helpful skill for those with Autism].

A more entertainment based concept is to consider how do the two players cooperate through a challenge at a distance [they cannot see, hear, touch each other in reality] without verbal communication?

For instance, how would you cooperatively achieve a shared goal when you speak no Japanese and your partner speaks no English? How do you then interpret frustration, or leadership, or positive reinforcement from body language alone?