Deadly apropos reality TV Sci-Fi satire with a fun, absurdist twist at the end. Directed by Elio Petri, whose work is really worth unearthing, the film is  based on Robert Sheckley's short story, The Seventh Victim, but was later novelized as The 10th Victim. Echoes of the assassin game can be found in Alistair Reynolds novel, Revelation Space, but with much less wit and much more hubris.