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This sequence showcases Duolingo's highly engaging gamification mechanics. It begins with a greyed-out flame that bursts into a vibrant orange fire, scaling up with particle sparks as the streak counter increments from 3 to 4. Below, a weekly calendar row animates, checking off the current day with a satisfying pop. The next screen introduces a friend streak, where two flame shapes morph into user avatars, prompting a nudge action. Finally, a quest completion screen features a progress bar filling up, a chest icon wiggling, and reward gems flying up to increment the user's total currency counter.
