So I tried adding the improvement patch to what I figure is a clean copy of the Super Mario World NES rom, and was treated to a grey screen. The game would run, just without any visualizations. If I selected a level, the graphics with reappear with this rainbow strobe effect and would not proceed beyond that. So, why is this happening? Could the rom be pre-patched with the physics patch and the two patches be incompatible with each other?