Who Wants to Be a Millionaire (US): Contestants must answer a series of 15 questions in order of increasing difficulty, to win the $1 million dollar grand prize. With the help of three (or four) lifelines, a contestant gets a chance at the big money. In 2008 a clock was introduced to game play. The contestant have 15 seconds to answer the first 5 questions, 30 seconds to answer the next 5 questions and 45 seconds to answer the next 4 question. If a contestant were to get to the 1 Million Dollar question they get 45 seconds plus any time they have banked over the previous fifteen for example if on the first question they answer the question within 5 seconds they would have 10 additional seconds for the 1 Million Dollar question. Also introduced in 2008 is a category system, the contestants get to see the categories of each of the questions that they will face.