Mensa: Crossword

Tired of the same old crosswords? This collection from Mensa, the international high IQ society, offers a staggering variety of puzzles, from clever cryptic crosswords to truly encrypted answers (which you must decode to find the real words in the puzzle), as well as cubic crosswords, anagram clues, alphabet crosswords (use each letter only once to solve), chaotic crosswords (with answers going in all directions), grids with no numbers or no blanks, and many other intriguing ways of filling in letters and words. The book is intentionally unstructured, with mixed puzzle types and degrees of difficulty, so you're never sure what challenge lurks on the next page.