Who knew that sudoku could have so much personality? They can—when famous names and intriguing riddles add spice to these popular puzzles. Here’s how it goes: on top of the page is a fun, partially completed clue about an unnamed person; for example, “He was in _____ for 27 years before being elected president.” There’s also a series of nine letters to use in solving the “who-doku,” and the grid itself has a number of circled spaces, as well as shaded areas. When it’s totally filled in, the circled letters provide the answer to the clue, while the shaded ones reveal who the person is. So the solution to the question above is, “prison” and the man is question is Nelson Mandela.