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iOS

Extra Challenges?

Hi, I'm working on the iOS Dev with Swift track and there has been mention of "extra challenges" at the end of the course (for example: In the Weather App course, we could implement weather for current location instead of hard-coded location)

However, I'm having trouble finding this list of "extra challenges"... Is there one?

I have noticed at the end of a few tracks there is an "Extra Credit" task but it is not seem accessible. It gives you the brief but it is sort of grayed out, not sure if you have to be a premium user to click on it or if you just do it on your own with nothing to validate it.

I would appreciate more exercises where you can validate your work.