Movie, where people are gathered in a room and the voice talks to them saying that the winner will get 5 million dollars. And they live there and start hating each other and finally someone wins and gets the bag but when the door opens, he appears in a room with people who've already won 5 million and then the movie ends, giving us a hint that those people will fight for all the money. Do u know the title? Or does part 2 exist?

House of 9 (2005) (http://www.imdb.com/title/tt0395585/)