There are at least two versions of Who Wants to be a Millionaire on Marketplace, a fancy (paid/expensive) XboxLive version and this free one. Not as fancy but it gets the job done for playing a game of general knowledge.
This application is an imitation of the well-known TV quiz ”Who wants to be a millionaire?”. The main goal is to become a millionaire by answering 15 questions that cover various fields. There are also 3 types of help you can use whenever you want.