If I see something that's obviously a puzzle (like Sudoku), it bugs me until I solve it. (Okay, maybe not Sudoku, as I've seen a few of those.) There are actually competitions (mystery hunts, if you will) that involve solving many types of more complex puzzles. I'm not really involved in that community any more, as there are many puzzles in the real world that are more interesting to me.
tl;dr: I build things. I ride a bike. I play games.