circle movie 2015

Circle (2015) is very good sci-fi movie with some horror element in it. If you haven't seen the movie, I highly recommend it.

Group of strangers found themselves in mysterious dark room in circle formation. After few minuets, one of them gets zapped and dies. Now they have to find out where they are what is going on. At the end, the strangers realized that they are playing some sort of sick game.