Note that this analysis seems to be based on the complete SMB3 disassembly, as RGME uses the same variable names. In my view, it was much more impressive to come up with the disassembly in the first place.

https://github.com/captainsouthbird/smb3

I totally agree, the explanations are detailed, easy to understand (at least for the initiated in hardware and binary logic, but I think he does a good job of introducing the gist of it before diving into the gritty details) and the presentation is excellent.

Youtube user Bisqwit has a nice series about password composing in retro games that I find in the same tier of interesting.