Monthly Badges

In Duolingo, there is such thing as a “monthly challenges”. What’s cool about it is if you complete it, get a “badge” that you can see; basically an achievement. What’s even cooler, is the challenges change in difficulty based on the user. For example, I joined Duolingo not even a month ago, and my monthly challenge was “finish 20 daily quests”. However, someone else who I talked to joined Duolingo over 600 days ago, and her monthly challenge was something like “finish 50 daily quests“. Adapting to the player's activity and skill level is an awesome way to encourage user activity. It would be really awesome if you could earn “racer medals” by completing monthly challenges in Nitro Type. These challenges could be as simple as “open the mystery box 10 times” or something like “complete ten daily challenges”. Maybe even harder ones like "complete 25 races with 100% accuracy". It would be a really awesome way to encourage more playtime. It would be built off most of the existing daily code process, and only require a little more work.