If you'd like to drive yourself insane in a very short period of time, I suggest you try this game of Sudoku. All you have to do is fill in the grid so that every column, every row and every 3x3 box has all the numbers from 1-9. Easy. Hah! It is pure evil. But then again, I've been known to say that about jigsaw puzzles. (I would like to add that I'm not advocating this game as a form of procrastination). Enjoy. And try not to beat your head too hard against the desk.