Hey everyone, just passing by with a little update for this thread.
So, I was unhappy with having this thread incomplete, so I got around doing some research to complete it with Famicom, Super Famicom and Game Boy data, it took some time, passing by through plenty of fansites, wikis and online message boards (some even in Japanese!) but I finally have a more complete archive.
First of all, I was only able to find data of the titles to sell over 1m copies on said systems, through most of my research I kept running into the same list of million sellers, so I decided to go with it as well, however as you may know that doesn't complete the top 50, so that's filled up with VGChartz's numbers.
Something interesting is that for the most part, VGC sales data was actually spot on with my findings, with some exceptions of course, so I decided to just filled it up taking it as fact, still VGC data is not entirely accurate, sometimes they have Japan sales data for games that weren't released in Japan and other times their numbers were really of (for example VGC has Mother 2 as 810k in Japan, it only did around 300k). So take the not million seller data of those systems with a grain of salt.
Will update 3DS' & NWU numbers (as well as the PlayStation version of this thread) in April, stay tunned.