1 vs. 100 is a BBC National Lottery game show based on the original Dutch version called Eén tegen 100.
On each turn, the One selects one of two categories and the host asks a multiple-choice question with three answer options.
Unlike other editions, such as the American version of the same name, a loss by the One does not allow the surviving members of the 100 to split the bank.
If all remaining members of the 100 miss the same question, the host announces this fact before revealing the correct answer and then gives the One a choice.
The potential top prize is £250,000, achievable if the One uses no dodges, eliminates every member of the 100 on a double-value question, answers it correctly, and chooses not to end the game.