At some rainy days, when I realise again the TV program is getting worse and worse ... I visit Cody:
Cody™ is a MATLAB Central game that challenges and expands your knowledge of MATLAB. As a web service provided to the community, Cody helps you sharpen your programming skills by solving problems and interacting with other members of the community.
It's unlike Mathematica.SE: The equivalent of Mathematica.SE would be 'Answers', a platform for questions and answers.
In Cody, community members program little games/challenges for others. You can try to solve these challenges by typing code directly into the browser. Sending your solution will be checked and rated instantly.
I definitely had some fun with Cody, so I'm wondering if there is something similar for Mathematica?
Or how do you improve your Mathematica skills in a playful way?
PacletFindRemote["WPL*"]. You can download the paclets, but most of them are unfinished. It looks like a so far unreleased product. $\endgroup$