Here is a one fo the major mario games 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!