The headline feature of 4.0.0 is the complete overhaul of the Super Mario World game style. The sprites have been updated to be more accurate to the SNES classic, and the physics have been fine-tuned to mirror the "floaty" and precise controls that speedrunners love.

While versions like 3.2.3 and 3.5.0 are the most stable widely available builds, version 4.0.0 introduces several ambitious changes: