Who Wants to Be a Millionaire (often informally called Millionaire) is an American television game show based on the same-titled British program and developed for the United States by Michael Davies. The show features a quiz competition in which contestants attempt to win a top prize of U.S. $1,000,000 by answering a series of multiple-choice questions of increasing difficulty (although, for a time, most of the questions were of random difficulty). The program has endured as one of the longest-running and most successful international variants in the Who Wants to Be a Millionaire? franchise.