A recent film (last 5 years) which involved a group of young people who had answered an internet advertisment for a reality 'big brother' style weekend in an isolated house where every move would be filmed. If they could survive in the house with nobody leaving or dying the survivor would get �1m/$1m. Someone sent one the the men a letter hidden in a 'food' parcel which said that a valued relative was dying, in order to make him want to leave. The house was quite old and run down and situated in a wire fence compound in a clearing in some woods and the weather was very cold and snowy. They were allowed to go outside the house but not the compound. Soon they started to die under strange circumstances and as only a few were left somebody found a way to connect to the internet to try and find the original website, only to discover that they were actually being filmed for a snuff movie. In the end it seemed that one of the group was actually the killer and towards the end it became increasingly gory until he locked a lone female in a freezer room, and his accomplice turned up in a car. I cant remember the actual ending . . .