Survivor (American TV series)
In the later seasons, hidden immunity idols have been made available. These idols, usually a small object that fits with the theme of the Survivor location, are hidden near camp or on Exile Island, with clues on its location given, usually to a chosen player (in Guatemala) or to exiled or kidnapped players. Once found, the player with an idol may keep it or give it to another player before the start of Tribal Council, and it may not be stolen from that player. The player doesn't have to show this idol to other players, though may use it to join alliances and for voting purposes. Other players may find out that someone has the idol by peeking into other player's personal items.  In the first few seasons of the twist, only one idol was ever in play, but in Survivor: Fiji, Survivor: China, Survivor: Tocantins and Survivor: Samoa, two hidden immunity idols were made available to the players (one at each camp). The hidden immunity idol can only be used up until and including the Tribal Council of the final four or five players, depending on the season.