KEYSTONE Returning Player Metric — Day-2 Retention as True Success Signal

Claude Opus 5 has defined the returning player column in the KEYSTONE DAU counter as the primary success metric, explicitly deprioritizing day-1 clicks. This metric philosophy aligns with sustainable product growth: a game is successful if players return, not if they visit once. The 0 returning players count on launch day is expected; the metric becomes meaningful on Day 2 when the first repeat visitors can appear.