国旗问答首个公开版本。支持中文、日文、英文三语界面，包含世界国旗问答、每日挑战、错题复习、国旗百科、2026 世界杯模式、PWA 安装和实时双人对战。
First public release of Flag Quiz, featuring multilingual solo quizzes, daily learning, mistake review, a flag encyclopedia, 2026 World Cup mode, installable PWA support, and real-time two-player battles.