This is a version of the standard charades game that my son, Sergei Bernstein, invented.
Unlike in regular charades, the person who acts out the phrase doesn’t know what the phrase is and has to guess it. The viewers on the other hand, know the phrase but they are not allowed to talk.
So the actor is blindfolded and the viewers are not just watching; they are actively moving the actor and his/her body parts around to communicate the phrase. For example, if the actor is on the right track, since the viewers can’t say, “Yes, good!”, they might communicate it by nodding the actor’s head.
Sounds like fun, especially for people who enjoy touching and being touched.