I guess it's the theme, but I like this game alot more than I should.  It is definitely a kid's game, and it isn't something I would play with just grown-ups, but still.  I like finding all the little treasures.  My six-year-old son has Pokemon cards, Rat-A-Tat-Cat, Guess the Pokemon Game, Castle Keep, Sorry Sliders, Incan Gold, and this game.  Of all of them, The Secret Door is my favorite.  The treasure and clock cards are tiny and thin, and the board is pretty small, so if you need top of the line components you might want to steer clear.