While under stress to deliver the project, my co-worker and I decided to play sudoku even though we had more urgent things to do. We copied 2 pages of my sudoku puzzle book (which contains 4 puzzles), and decided to solve a specific puzzle on our own. Oh, and I tore the solutions page out so I wouldn't cheat. I managed to solve that puzzle before I slept, and then I woke at 6 to solve the other three. This morning when I arrived at work, I found my co-worker's copy of the puzzles on my desk, all completed accurately. lol.