A strange little side quest
Put Butterfly Kyodai next to the history of puzzles and a few unexpected connections appear. Arthur Wynne published a diamond-shaped 'Word-Cross' in the New York World on December 21, 1913; the name later shifted to 'Cross-Word' and then 'crossword'. The broader history adds one more wrinkle. Nintendo's Donkey Kong arrived in 1981 and introduced the character first known as Jumpman, who later became Mario. Grombi files that under: small game, surprisingly large backstory.