1 vs. 100 is a game show created by Endemol that is aired in several countries. The game pits one person against 100 others for a chance to win a large cash prize. The game first aired in the Netherlands as Eén tegen 100, sponsored by the Nationale Postcode Loterij (National Postal Code Lottery).
In all versions of 1 vs. 100, one player is selected to play the game as The One against 100 other people, collectively known as The Mob (or what "Mob" translates to in the local language). Depending on the format of the game, the player can be selected randomly from the Mob, or selected independently. To win the game outright, the One must eliminate all 100 members of the Mob by answering questions correctly.
After having the opportunity to select a difficulty level or a category in some versions, a multiple-choice question with three options is revealed (on some versions, such as the U.S. and Australia, the player is given only the question, with no opportunity to select a difficulty and a category). The Mob is given a short amount of time (15 seconds on the US show, 10 seconds on the Brazilian version, 6 seconds for other versions, such as Australia) to lock in their answer before The One is given the opportunity to answer the question. If the One is correct, all Mob members that answered the question incorrectly are eliminated from further play, bringing the lone contestant closer to winning the game. The amount of money in the contestant's bank also increases by an amount dependent on the number of mob members eliminated in that question. If the contestant eliminates all 100 mob members, he or she claims all the money in the bank or a fixed top prize. However, if the One is incorrect, the game ends and he or she leaves with nothing. In some versions, the remaining members of the Mob who answered the question correctly split the losing contestant's winnings. In some other versions, one or a few of the 100 mob members may receive the losing contestant's money through a random selection.
The One can select from a limited number of "helps", "escapes" or "dodges" depending on the version; escapes or dodges exempt the player from having to answer the question, but part of the bank must be forfeited (except in France, see below). Alternatively, a player can obtain more information on the mob's answers by using one of the "helps". In some versions of the game, the contestant is given the opportunity to take the amount in the bank and leave the game in between questions.
Some versions even have "jokers", mob members who are worth a certain amount rather than the standard amount for the question should they be eliminated after a question is answered correctly. There are usually three on versions that have them.