Logic & Brain Teasers in 2000

Quizzing: Everything You Always Wanted to Know, But Didn't Know Where to Look: The Ultimate Trivia Book by Thomas, Ranjit

Kokology: The Game of Self-Discovery by Saito, Isamu, Nagao, Tadahiko

The Times Cryptic Crossword Book 1: 80 world-famous crossword puzzles by The Times Mind Games