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How do I request a refund?

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The Redis challenge was extremely fun. I ended up having to read the Redis Protocol specification doc pretty carefully in its entirety! The result felt like lightly-guided independent study, if that makes sense. (Which, again, was lots of fun)
Huge fan of "build your own x". Really glad there's a nicely polished challenge site for them. Definitely going to recommend to others!
I've started the Docker challenge, enjoying it a lot so far. Just the right level of guidance, helpful and still gives you a lot of freedom to explore and learn for yourself.