You have probably seen the playground of @Marchete on Voronoi Diagrams. It is super helpful for some multis on CG: Tron Battle, Back to the Code, Hypersonic...
@Sablier also created a playground on genetic algorithms. I believe a lot of CodinGamers will find it very useful!
We believe that this kind of playground could be very great to our community. So we want to reward their creators (and reviewers) with XP (we can't add XP to people like that, but we will be able to do it soon ) and add the links to the playgrounds in the detail page of the relevant puzzles/games.
So, if you're interested in creating this kind of playground, join the beta of Tech.io (you don't need a key anymore) and let me know!