Super Mario World (SNES)

Utilities

Lunar Magic is the principal Super Mario World hacking utility. It is available here or here.
BlockTool is a block editor that allows you to add in custom blocks. It can be downloaded from SMW Central.

There are ostensibly many complete hacks of Super Mario World. There are several that stand out among the crowd, including:
- Super Mario Odyssey Demo
- Super Demo World: The Legend Continues

Super Mario World was the first SNES game, and is quite possibly the most extensively hacked SNES game. In the game, Mario, Luigi, and Princess Peach have taken a vacation in Dinosaur Land. Mario and Luigi fall asleep soon after coming ashore, and Peach is kidnapped. When Mario and Luigi wake up, they immediately chase after Bowser, rescuing Yoshi from an egg along the way.
Super Mario World was remade as Super Mario Advance 2: Super Mario World for the GBA.

ROM addresses thread, current acmlmboard incarnation
RAM map - The first memory map
Memory Map 2 - The newer memory map with more features, but it currently has fewer addresses.
Super Mario World Data Repository - New tile sets and a neat ASM hack
OK! Impala - Translated Super Mario World into Dutch. It can be downloaded here.
Acmlm's Board - A forum on Super Mario World hacking
SMW Central - "THE only place for Super Mario World resources."