[Arneldo]

From series 4 onwards BBUSA has had a major twist that has effected the game. Which has been your favourite?

Big Brother 4 - The X-Factor
Five housemates were unexpectedly joined by the their ex-girlfriend or ex-boyfriend.

Big Brother 5 - Project DNA (Do Not Assume)
Two housemates discovered during their time in the house that they were half-siblings and shared the same father. Also, twin sisters entered the house and switched places for 35 days.

Big Brother 6 - Secret Partners
The seasons twist was that each houseguest was secretly partnered with another houseguest (totalling seven pairs) they had known prior to entering the Big Brother house. These partners played the game as individuals, but if both managed to make it to the final two, the winner would receive $1 million while the runner up would receive $250,000.

Big Brother 7 - All-Stars
All of the housemates had previously taken part in BBUSA and 8 of the All-Star housemates were chosen by the public.

Big Brother 8 - Biggest Nemesis / America's Player
Three of the housemates were joined by their "Biggest Nemesis". Housemate Carol was joined by her ex-best friend, Jessica. Danielle was joined by her estranged father, Dick. And Joe was joined by his ex-boyfriend Dustin.

Another twist was America's Player. Housemate Eric was working for America and though out his stay in the house he could only nominate/vote/campaign for the housemate America's chose him too.

Big Brother 9 - 'Til Death do Us Part
All 16 housemates were paired up with another housemate and they played the game as couples for 3 weeks.

Big Brother 10 - Back To Basics
Well, the only big twist here was that there wasn't a big twist and that for the first time since the shows 3rd series - all of the housemates were strangers.

Big Brother 11 - High School Cliques
The housemates were seperated into High School Cliques; Popular, Athlete, Brains and Off-Beats.