Trying to Puzzle out Advances

[EightBitz]

Originally Posted by Duggan

That's a possibility. I partly limited the list because otherwise it's just way too much.

I also got it to avoid allowing skill duplication.

Not trying to be facetious here, because there are some things I still don't grasp very well, but can't you avoid skill duplication by designating each skill as "add once" or "is unique" or something like that?