Ranklet - A daily deduction puzzle: rank five real cities
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Five real cities. A handful of clues that are all true. Exactly one order that satisfies them. Ranklet gives you one deduction puzzle a day. Rank the cities by area, population, latitude or another real attribute, and there is never anything to guess.

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Hi Product Hunt! I'm Jongjin, a solo developer from Korea.
Five real cities. A handful of clues that are all true. Exactly one order that satisfies them.
Ranklet gives you one deduction puzzle a day. Rank the cities by area, population, latitude or another real attribute — and there is never anything to guess. The clues are generated so that a single ordering works, which means if it will not come out, there is a clue you have not used yet.
It's free on iOS and Android, with optional in-app purchases.
I'd love honest feedback: what feels confusing, and what would make it worth keeping on your phone?