“The Belko Experiment” (**1/2 out of four) was an interesting, if not altogether successful, mashup of “The Purge” and “Ten Little Indians” about 80 Americans (including Tony Goldwynn, John C. McGinley, and John Gallagher Jr.) being locked in their high-rise corporate skyscraper office and being directed by an unknown voice on an intercom to participate in a deadly game of kill-or-be-killed and pretty soon the bodies start piling up. Mixture of parody of corporate office politics and intense carnage doesn’t fully gel and gets progressively uglier and violent in its final third. Still, a respectable try and at least it holds your attention through-out.