On the Code Examples section from the challenges, it should be nice to have the possibility of see all code, not just last changes, on the end of the challanges its quite criptic to see just the change snippes of a code without all the context (its available just on repos that are published on github)
Also I find really usefull the colaborations with programmers to solve the challenges like the https://www.youtube.com/watch?v=jf_ddGnum_4, nice to how other people faced the same problem and their workflow, i miss more of this collaborations.