I second the Shenzhen I/O recommendation, because apart from only assembly programming, the game also has other constraints in the form of having to spacially arange various chips on a limited "enclosure" for the product you're building and connect them. It also rewards optimization both in terms of assembly and chip usage efficiency. Is a wonderful game, really.
It also has a really cool solitaire game-in-game as an... addition? Ornament?
I will reveal that I have played far more of Shenzhen solitaire than Shenzhen I/O itself. Zachtronics made a stand-alone version of the game[1], but there's also a fanmade version here:
https://shenzhen-solitaire.tgratzer.com/
Which I find more enjoyable, both because it's online so it's easier to reach from anywhere, and also because I feel like the version of the solitaire inside the game is a bit... heavy feeling. Like there's some sort of input delay? Anyhow, I must have around 3000 completed games of solitaire across my devices.
[1]https://store.steampowered.com/app/570490/SHENZHEN_SOLITAIRE...