I used to have the Mac LC version of Mario is Missing. My brother and I would play it a lot as a child. The load times were terrible, at least as a child, it may have been our computer, I'm not sure. But the game was actually pretty decent. We clocked many hours on the thing during the summers. Later we got Mario is Missing on NES, and that game sucked in comparison. Not sure how the PC game is, but I suspect probably closer to the Mac LC version.