My friend Marla got us one of these for Christmas. We've barely put it down since. Totally addicting.
I had to rush out and buy one for my son, the sports edition, and another for Mia, the zoo edition. My son looked dubious, at best, when he unwrapped it, but I told him, just you wait. You'll be hooked, too.
Really, a very simple concept that is so entertaining, appropriate for every age, and great for keeping kids or adults busy for hours.