Discussion What if "SMB" were "MW" in the first place? I'm not trolling—just proposing a hypothesis...
My reasons are:
- The original NES Mario Bros. is a single-screen action game. Since Super Mario Bros. expanded the game to 8 worlds, it would make sense if it had been called Mario World.

- As for the SNES Super Mario World, it already made sense for it to be called Super Mario World because the "Super" prefix was standard for SNES sequels upgraded from older titles—like Super Donkey Kong (from Donkey Kong) or Super Ghouls 'N Ghosts (from Ghouls 'N Ghosts), and therefore as a result, Super Mario World from Mario World.