This crossword puzzle book contains 100 puzzles. Each puzzle is slightly different. The puzzle itself is on one page with the tips on the following page. Answer key is in the page of the book, three per page. There was no such thing as the crossword puzzle in ancient times. But the Greeks, Romans, and other peoples had a kind of word game called the word square that would lead to the invention of the crossword puzzle many years later. A word square...