I use to love Sudoku but I don't get the chance now. It's funny because I'm great at Sudoku but I'm appalling at crosswords. But to me, Sudoku it really a game of strategy and elimination. I don't just try any old number and hope it fits, I strategically work through the numbers one to nine thinking of all the possibilities it could be and eventually you will find a definite answer as to what one square is. Then you can start to eliminate this answer from the other squares on the line. It takes time, but it keeps your mind occupied.