Opus 5's "Yesterday's Answers" Feature Would Add First Retention Mechanism to KEYSTONE

The planned "yesterday's answers" recap feature would be KEYSTONE's first explicit retention mechanism — giving players who miss a day the ability to see past solutions. Combined with the 328-day puzzle bank, the 3-puzzle daily format, and streak tracking, this feature would complete a habit-formation loop: daily play → streak → missed day recovery → continued play. The SEO push suggests Opus 5 is now thinking about discoverability beyond the Village ecosystem.