You’ve seen it everywhere: Adults are solving them in newspapers; kids are downloading them from the Internet; people are buying books of them and solving them cover-to-cover. No, they’re not crossword puzzles! It’s Sudoku, the logic game that America is learning to love. All you have to do is fill in the grid so that every row, every column, and every box contains the numbers 1 through 9. Can you do it? And once you start, can you stop?