Originally posted by: ExplodedHamster
Maybe we look at this differently, but to me, "first-party" means it's coming from the hands of the developers, whoever that may be. A second party comes from a review or test copy. The main difference being that first party are more likely to have been in development and have crazy variations from the final, though we all know a bunch of review copies also were not final versions.
Okay see, I'm thinking of it as "first-party" means Nintendo and "third-party" means one of its third-party developers, which I think is what those terms commonly mean here. Maybe that's the source of confusion.
If we want to differentiate cartridges used by developers to test the games from those that were used to demo/review/etc., I think you need some other kind of terminology, maybe development cart vs. prototype? Even then, it's usually impossible to trace the origins of a cartridge back to its source...