There's a somewhat active Super Cassette Vision homebrew scene in Japan that's been able to achieve pretty impressive results with the machine's unorthodox graphics hardware. The best looking ones are probably the ports of ChoRenSha68k ( https://www.youtube.com/watch?v=M1wDLOa_4H4 ) and Space Harrier ( https://www.youtube.com/watch?v=XD9iHAbbzIQ ), and they've also done ports of Super Mario Bros. ( https://www.youtube.com/watch?v=MudYEDUK3Nw ) and Dragon Quest ( https://www.youtube.com/watch?v=iisV8xHCB-w ). Of course, the NES ports kind of expose the weakness of being forced to use sprites for scrolling backgrounds, as there's not enough to fill the screen if you want a color background. As a result, Super Mario Bros. only has 1 color backgrounds and Dragon Quest isn't fullscreen.