Worldly is a world-knowledge and cultural-awareness learning game. It quizzes you on capitals, flags, languages, religions, maps, music, phrases and current events, and uses spaced repetition so the things you get wrong come back until they stick.
The whole game runs in your browser — there is no account and nothing to install — which is also why it cannot run with JavaScript turned off. Enable JavaScript for this site and reload to play.
Source and issue tracker: github.com/IBR10/worldly