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This is great, I used this years ago when I was learning about flexbox.

There's also https://codepip.com/games/grid-garden/ by the same author that uses the same approach for CSS Grids.

Games seem to be a great way to learn CSS. I'm guessing because it has very natural learning path were you can solve increasingly hard problems that all seem easy because of what you've already learned.

I enjoyed this game to learn CSS selectors a while ago: https://flukeout.github.io/

One might even say these games have a cascading level of difficulty

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