[notafraudster]

MHRD is pretty fun. The implementation is a little janky (it's written in Java, the interface isn't accelerated, the leaderboards are a little broken), but as a game it's basically "starting with a NAND gate, build a processor from scratch, using components you've built in earlier levels". Honestly, for me, it was like a refresher of the 6 month processor design course I did in my CS degree 20 years ago.

You might find it a little simplistic given your day job, but for anyone else reading, I found it really fun.

Side note: If you like MHRD and want something a little less real world and a little more video gamey, try TIS-100, which might be the single best game on Steam.