Sudoku

I have to admit I have a slight obsession with Sudoku.  You know...the number puzzle.  I'm not to shabby at it either.  Anyway, every night I get into bed and attempt my puzzle.  I cannot go to bed without doing at least one of these.  I think I have a problem.  I admit I have a problem, but Sudoku is just so darn fun I don't plan on breaking my habit.