You know, there's one thing that we hackers need to do about the NES hacks of FDS-based SMB games: use SRAM mapping when doing so, to retain the special FDS-exclusive features of these games. Most of these FDS-based games that are already out there, when hacked for use on the NES, lack the FDS-specific features.

The FDS-based NES titles:
*Super Mario Bros. (in which the Minus World, World 36, consists of stage 1 being 1-3 underwater, stage 2 being a normal 7-3, and stage 3 being 4-4 underground)
*Super Mario Bros. 2 Japan (what we call "The Lost Levels")
*All Night Nippon Super Mario Bros. (in which there are virtually no recycled stages (until World B) or SMB1's 8-4; thus, the SMB1 versions of Worlds 5-3, 5-4, 6-4 and 8-4 are replaced by their respective SMB2J versions, while Worlds 7-2 and 7-3 from SMB1 are replaced by 6-2 and 6-3 from SMB2J, which are recycled in World B as B-2 and B-3 after you beat the game at least 8 times)

~Ben