A massive World 9 serves as a "post-game" gauntlet for experienced players.
A: Mods like this push the original game's engine to its limits. Make sure you're using a clean dump of an NTSC-U (USA) or PAL (EUR) version of the game as your base, as mismatched regions can cause problems. Also, check online forums dedicated to the mod for specific bug fixes or patches. mario 39s final adventure wii wbfs patched