are free to quit the game, though they will not be allowed entry back into the house. Should a HouseGuest break the rules of the game, they could be expelled from the house and unable to return. The contestants compete for a grand prize of $500,000 (or $750,000 starting in the 23rd season). Season 1 The premiere season, the format of the show resembled the original Dutch version of the show—a format adapted by most versions. As the format of the show emphasized the social experiment aspects of the premise, the competitive aspects were minimized: HouseGuests did not compete for power or safety, and the nominations process was not discussed by the HouseGuests. Every two weeks, each HouseGuest participated in a mandatory voting called Nomination which decide a list of HouseGuests nominated for eviction, also known as "Marked for banishment". Each HouseGuest secretly nominated two other fellow housemates, providing full reasons for their nominations. In the event of a tie, the two or more HouseGuests with the most nominations became marked for banishment and faced the public vote for the following week. Towards the end of the season, the nominations process reverted to a weekly process. After the nominations were finalized, a public voting window opens for America who vote for which HouseGuest would be banished through televoting. This process continued until three HouseGuests remained, where the final vote was changed to determine the winner of the show. The winner won the $500,000 prize, the runner-up left with $100,000 and 3rd place left with $50,000. The competition however, received negative reception from both critics and viewers. Season 2–present Having spent millions on the series, CBS issued a second season of the series and announced that various changes would occur with the current format, putting more emphasis on competition and strategy that bears resemblance to the format from another CBS show, Survivor. At the start of each week in the house, the HouseGuests compete for three types of competitions, Head of Household, Have-Not, and the Power of Veto. For the Head of Household, HouseGuests compete for immunity from eviction and the power to nominate two HouseGuests for the eviction, and often receive privileges such as their own personal bedroom and free laundry service; however, the incumbent Head of Household is not able to compete in the following week's Head of Household competition, meaning that a HouseGuest cannot hold the title for