There are a lot of good and free games, but after having been played, most of which may be generally deleted from our hard drive without hesitation, especially those that are easily up to several GBs or even more so-called masterpieces. But for some games, you probably  want to treasure them forever, because you know that those are rare gems in your lifetime. Cave Story is such a game, of course, perhaps also because it is less than 1 MB (600+ KB) in size.