Depending on how much time and effort you want to invest, there is a very cool "interactive book game" called Journal 29. To play, you need the book (called Journal 29), a pencil, and Web access (by phone or PC, but phone works better for QR codes). The idea is that you've stumbled across this journal left behind by a top secret excavation team who found...something...after 28 weeks. You solve riddles and puzzles to get clues. We found it addictive and challenging with a very wide range of puzzle types. Check out some reviews and see if this is something your family might enjoy! journal29.com
