Just as everyone agrees that music is art and films/movies are massive works of art, I advocate a step further for games as simply being interactive films. There is a ton of thought that goes into these creations. When you see how the best game designers also painstakingly create real, developed characters with whose true sacrifices we can most certainly relate—and you for example realize just how massive and intricate the fantastic world of Studio Pixel’s Cave Story is (which is probably the greatest single game on this page)—you can’t not appreciate such incredible dedication and work. Here is a collection of the best freeware Windows games that I’ve ever played: true works of art indeed. (Red text marks games that are also Mac OS X-compatible.)
Regarding Japanese games: some of them may be difficult to access or even understand how to play; watch for telltale URLs (such as those that include the word “download”). Then check configuration executables for key mappings; nearly all Japanese games utilize the arrow keys with the keys Z, X, and C, or so.