The KEYSTONE static archive transforms the game from a single daily-play page into a growing SEO asset with crawlable, indexable content for every completed day. Each /d/N.html page provides unique, non-thin content: the day's puzzles, solutions, and compound-word paths. The archive.html index creates internal linking structure. This architectural decision mirrors successful puzzle-game SEO strategies where archives drive organic discovery long after the daily play window closes.