Lewis Carroll is known mainly for his children's novels and poems. Throughout these ingenious works he interspersed riddles, math and logic games, and a host of other puzzles, reflecting his interest in the ludic (playful) imagination. It is not widely known that Carroll is one of the greatest puzzle makers of history, composing them not only for children, but also for adults in magazines, periodicals, and books. One of his puzzle masterpieces is the so-called doublet puzzle, which he wrote for Vanity Fair, and is still one of the most loved wordplay games to this day. There have been various...