Here is a major ASM hack which allows you to play as Mario in the Airman world of MegaMan II! It is only one stage but it is an entertaining hack and shows what can be done with hard work done! The graphics on AirMan may be garbled but it will not effect play-through. There are two versions of this patch. One which is just the AirMan stage and the other which integrates some of the first stage of Super Mario Bros. into it which makes for more of a challenge. Enjoy!
Super Mario Bros. (World).nes - NOINTRO
CRC32: 3337EC46
MD5: 811B027EAF99C2DEF7B933C5208636DE
SHA-1: EA343F4E445A9050D4B4FBAC2C77D0693B1D0922
SHA-256: F61548FDF1670CFFEFCC4F0B7BDCDD9EABA0C226E3B74F8666071496988248DE