In my opinion, having challenge without a deadline that a walkthrough or hints are available waste interest in the topic; aka get an email, build interest, etc.
Spend enough time learning the instruction set and the concepts involved and the answers will become apparent.
Honestly really isn't for myself, but based on experience teaching a wide variety of people, that some people learn different ways and are more willing to take something new on if they feel they won't break "it" (which is what the website does) and feel there's a built-in for getting to done. Most users get that connect the dots isn't the same as DIY, but still a option that helps some users that would have never tried, but were interested in the topic. Thanks for commenting.