It's hot, fun, mind-boggling, and once you start, you won't want to stop. It's sudoku — the new puzzle rage that's got the nation in a frenzy. crossword editor Will Shortz presents yet another stimulating and fun collection of 150 sudoku puzzles, ranging in difficulty from easy to more challenging. There are just a few simple rules: Fill in the empty boxes in the grid of 81 boxes, divided into nine three-by-three squares, so that every row, column, and square contains the numbers 1 through 9, without repeating. You don't need any mathematical knowledge. Whether you're a crossword enthusiast or a lover of puzzles, you'll want to try this latest sensation. Don't waste any more time. Pick up a pencil and test your wits with sudoku!