I love to use versions of Who Wants to Be a Millionaire game within my classroom to review key concepts and vocabulary. It extremely interests kids when you play a game, plus the new Common Core Standards suggest finding ways to incorporate vocabulary into the learning of content. This could be something you do after a reading a passage about Matter and Its Changes. Please remember to start the game over if someone doesn't make it all the way to $1,000,000. The game is over when someone answers all 15 questions correctly. What a REVIEW! Hope you find it useful!