There are many more games apart from the Flexbox and Grid ones from this creator[1].

CryptoZombies[2] is often the recommended start for anyone wanting to learn Ethereum's Solidity and associated front-end library. It's not as gamified though.

[1]: https://codepip.com/

[2]: https://cryptozombies.io/en/course/

I've found that interactive tutorials/courses, like those that KataCoda seems to offer are a pretty interesting approach: https://www.katacoda.com/ (someone once linked one of their Kubernetes courses, it was pretty nice; seems to be locked behind a signup now)

There was a site that also helps you learn Git in a really nice visual way: https://learngitbranching.js.org/

On a slightly unrelated note, i think that it's also important to figure out what to learn in the first place. Therefore, i think that this site is pretty useful for seeing some of the common technologies or practices: https://roadmap.sh/