The Million Second Quiz
At any time, a contestant may choose to "double" instead of answering the question. If the contestant does so, the question's value is doubled, and the opponent has to either answer the question or "double back", which quadruples the point value and forces the person who the question was given to answer. If a doubled or doubled-back contestant answers incorrectly or does not answer in five seconds, the opponent gets the points. Contestants can choose to double as often as they want during a bout.