[vichu]

Games as teaching tools is definitely an interesting topic.

You might get a kick out of https://vim-adventures.com/ or https://cssgridgarden.com/ or http://www.flexboxdefense.com/

These are just off the top of my head - would love to see other examples.

[DylanSp]

https://deadlockempire.github.io/ is a good example, focused on multithreading.