Do you know the three-letter word for a female sheep? How about the four-letter name of Dr. Frankenstein`s assistant? And can you complete this song title with a three-letter word: ___ to the World ? Ready to take on more clues? Then try your hand at a host of crossword puzzles for hours of challenges and amusement. They`re filled with words for things that kids know a lot about -- games, food, school, sports, music, geography, and so on. And they vary in degree of difficulty. Some of the clues can be answered with a short word; for others, you`ll need to think of two words. If you get stumped, check the back of the book where all of the answers are provided. And speaking of answers, here are the ones to the questions above: ewe; Igor; and Joy.