And I'll recommend Turing Complete game on Steam if someone wants to have full journey.

It's a puzzle focused on creating electronic components (with the goal of creating a running computer). Since it's more educational than competitive it's rather smooth journey.

But in the end there's not only assembler but there are actual electrons in the system that take time to reach CPU. It took me 2-3 days to finish during Holiday period and it made me much more aware of what is happening under the hood.