A strange little side quest
A quick detour while Jigmerge Puzzles waits for your next move: 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'. There is another connection worth keeping in the same mental pocket: Pac-Man went on sale in 1980, and its creator Toru Iwatani famously linked the character's shape to a pizza with a slice missing. That gives Jigmerge Puzzles a little more company than it first appears to have.
