Challenges! I like name Challenge
LIke a good few respondents I don’t think ‘challenges’ makes sense. How about ‘steps’ or ‘stages’? Each one is a part of the overall Code Challenge.
The downside of both is that they imply a linear structure to the course and that might not fit. Should ‘Stage 15’ be possible if you haven’t completed ‘Stage 14’ for example?
I guess ‘step’ also has a bang of AA about it, and that might not be a great association …
What about ‘round’?
Actually round, step and stage are all awful ideas. I think ‘exercise’ is the most suitable.
for “Mission”. I simply like sound of “mission”.
Exercises
Challenges
I prefer challenges. It sounds more motivating than the rest. 
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