competition of each season features three rounds; the first is endurance-based, the second is skill-based (often with a memory component), and the final is quiz-based (usually narrated by the Jury members). One of the Head of Household's duties is to nominate two HouseGuests for eviction; in the case of Final three, the Head will instead vote to evict one of the remaining two HouseGuests since these HouseGuests are nominated by default. Power of Veto (PoV) The Power of Veto is a power first introduced in Big Brother 3. During its first season, it did not allow a nominated HouseGuest to use it on themselves. The final Power of Veto that season was the Golden Power of Veto and allowed a nominated HouseGuest to remove themselves from the block. Following this, the Golden Power of Veto was used in all subsequent seasons. The Diamond Power of Veto, used in Big Brother 12, allowed one HouseGuest to remove themselves from the block. as well as choose the replacement nominee only moments before the live eviction. Power of Veto competitions differ drastically from the Head of Household competition, with PoV competitions being more skill-based in nature. Competitions such as the "Pop Goes the Veto!" competition, which required HouseGuests to find letter tiles and spell the longest word, have been used in numerous consecutive seasons. Competitions such as the "Big Brother Boardwalk" competition see HouseGuests attempting to guess how much of an item there is; this is one of various competitions that do not require HouseGuests to compete in a physical-based competition. The "How Bad Do You Want It?" Power of Veto competition, first introduced in the seventh season, saw HouseGuests taking punishments in exchange for advancing in the competition. Variations of this competition have been used in numerous subsequent seasons. Food and luxury Food and luxury competitions have been a part of the series since it first premiered. In early seasons, the losers of the food competition would be placed on a peanut butter and jelly diet and would not be permitted to eat any other foods. Beginning with Season 7, the losers of the Have-Not competition were required to eat "Big Brother Slop" for food, and sleep in a special "Have-Not" room with cold showers and most discomforts such as hard pillows and beds for a week. Slop has proven to be an issue for some HouseGuests; in both cases on Season