Duolingo's gems feature release

Duolingo is a language learning app with a highly game-ified user experience, and consequently, high user engagement. In a recent update, Duolingo introduced the new "gems" feature. Let's see how they did it:

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Here, we see a modal window providing information on what gems can be used for, but not much about what gems actually are. Nonetheless, we like this modal window because it has a nice balance of text-to-visuals, as well as positive language in the CTA.

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Next, we see this clever CTA encouraging users to collect the fruits of their labor by opening a treasure chest. Fun!

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Finally, a success modal to give users the sense of fulfillment that seems natural at the end of a game-ified experience.