Definitely not for 9 year-olds! This is a book of lists and word games - trivia games, fill in the blanks, etc. Not stand-up-and-run-around games, but sit-down-and-write-the-answer games. For adults, might be fun, especially if you were into Trivial Pursuit. As a teaching tool or brain-teaser, OK. For a kids party, un-fun.