Finding Sudoku On the Web
Playing Sudoku will really eat most of your free time and will probably use most of your brain cells in order to complete it. Of course, you do not want a particular task to be left unfinished once you have started it, so most probably you will really consume your free time to complete it. If it is not enough, you will probably spend even some of your spare time before you go to bed. It is quite surprisingly true for most Sudoku solvers out there.