One of the tougher problems asks puzzlers to calculate how far off from writing the numbers one to 20 the quiz setters were.

Hamaguchi welcomes all interpretations of his elegant puzzler, adding that he found the process of writing and shooting “Evil Does Not Exist” restorative.

Those compounds didn't react at all, a puzzler the researchers are still trying to understand.

She was a voracious reader, ace crossword puzzler and heavyweight Scrabble player.

Meet the Millers, George and Roxanne, proprietors of the world’s largest collection of mechanical puzzles: physical objects that a puzzler holds and manipulates while seeking a solution.