I would personally just like to see official releases on this list, as I don't go out of my way to find the unlisenced stuff.

^ why dont you just have unlisenced stuff like in RED or some other colour so you could see that its no an official release. I think thats the best way to do a Master List. So that people could just be like oh thats not an official relase then just skip it, but then know about it. Or just have a pull down option to sort it? if tahts not to hard.

my workbook so far has seperate work sheets for US, US extras (re-releases, million sellers, etc.), Japan, PAL, Pirate and Wisdom Tree

its easier just keeping it all seperated

I think most collectors care more about where the item was issued than if it was licensed. Some collectors question Sachen games by saying there is little or not proof they were sold in the US during the systems lifetime.

So I would include all unlicened titles but perhaps not the Sachen gameboy ones. I don't think there are any reported cases of a Sachen Gboy game being sold in the USA during the heyday of the Gameboy.

This is pretty much what my list is, luckily there's only 5 unliscensed(wisdom Tree) Games

I would add the wisdom tree not the sachen though

A question almost related to the topic of this thread - what is the rarity of the Sachen games for the Gameboy? Are they common?

Well wheres the beef? Come on. Post it already. You can work on it as you go. And you know everyones gonna put there 2 cents in anyways.