Super Mario Land (1989) full walkthrough without commentary
I never owned a Game Boy, but I have some fond memories of playing Super Mario Land quite a bit as a kid. Birabuto Kingdom is my ringtone. :)
A history of the Super Game Boy
I've always liked the Game Boy even though I never owned one (not a huge gamer growing up). I never knew though that Nintendo had a game cartridge adapter for the SNES that let you play Game Boy video games on the console. This cartridge was known as the Super Game Boy. If you want one, you can grab one for about $15-35 on eBay.