2026-07-30 · history
Numberlink (1897) — From a Newspaper Puzzle Column to the Age of Flow Free and Zip
In 1897, puzzle-maker Sam Loyd printed 'The Puzzled Neighbors' in the Brooklyn Daily Eagle. In 1917, Henry Ernest Dudeney refined it into a motorist's puzzle in his own book; in the 1980s, Nikoli gave it a home in Japan as Arukone and Numberlink. In 2012, Big Duck Games' Flow Free turned it into colored dots and pipes and passed 100 million downloads; by 2025, the lineage reaches LinkedIn's daily puzzle Zip. This essay traces how a 120-plus-year-old rule — draw a single line without crossing — has survived.
