those are different though, because their games that have the addons packed in. I didn't list Donkey Kong 64(because thats how i got my expansion pak), or Namco's Time Crisis with Gun games because they generally sell the game with the device. I just mentioned Donkey Kong 64, but as a rule first party ad-ons don't do well. I didn't see Dk bongos take off because nobody used them outside of Nintendo. When first parties release and addon its like "hey we got this thing on our system, maybe some of yous 3rd parties can makes some games, come on! please?". When a 3rd party releases an ad-on its like establishing a platform on a platform, because the 3rd party release more games using the add-on. First parties find it difficult to find support for an add-on. Not to mention all those hit games are part of some gaming fad. Notice how dance games aren't as prominent as they were a couple years ago, but those music games are pretty much the same thing but super popular?