This is a hack made in a total of about 5 hours. It's a conceptual hack based on what SMB1 might be like if it were an old text-based BBS door game, or somesuch. That is, assuming that text mode could overlap characters and had absolute positioning, and sound and joystick control, etc.
Super Mario Bros. (World).nes
CRC32: 3337EC46
MD5: 811B027EAF99C2DEF7B933C5208636DE
SHA-1: EA343F4E445A9050D4B4FBAC2C77D0693B1D0922