From my understanding, the Gameboy isn't too popular with collectors due to the fact that it is difficult to find complete in box games. Despite this, I've still chosen to collect it, since the Gameboy has a lot of excellent titles and I'm okay with making boxes for them using DS game cases if I'm unable to find a game CIB. My question, however, is what games are the most difficult to find complete in box? I'm guessing that a lot of the first party Nintendo stuff is probably difficult to find, as well as Tetris, since it was a pack in title.