The Cast Member Autograph Book
This isn't much of a game, but one cool thing that my family started several years ago that helps brighten someone's day is an autograph book for Cast Members. It's really fun to see their reactions when you walk up to them with a pen and say that you want their autograph...needless to say that's usually met with a few seconds of silence. Most of them are pretty flattered that you would ask, and its a really really cool way to meet people that love Disney as much as you do.