Closed Level.

A company of carefree guys, passionate about computer shooting games, infiltrates a private laboratory where a military action simulator is being developed. Entering it, they find themselves in a world where the environment and what is happening are indistinguishable from real life. The guys manage to load into the "closed level" unfinished by the developers, where Belarus of 1942, occupied by the Nazis, is modeled. There, the guys are face to face with a real, not a computer war.