Community Challenge | 18
Pick any previous challenge!
To be more specific:
You could pick a previous challenge that you missed when it was first posted, or pick a previous challenge that you feel like you could have done better or differently.
If you haven't tried a community challenge yet, you could pick one that looks the easiest, the most interesting, or the most fun to try! I strongly encourage anyone who hasn't tried a Community Challenge to participate in this one, since you've got a lot of options!