Ending_1_Mapping.bin - paste contents into address: 0x00376FC
Open Tiles_1.bin in SonMapEd, Use Tiles_1_Palette.bin + Ending_1_Mappings.asm in SonMapEd with Tiles_1.bin.
Export as Bitmap, Modify image without modifying pink space, Re-import into SonMapEd over active frame.
Save as uncompressed tiles bin.
Recompress with utility.
Copy contents of compressed bin to address: 0x031788 (add "00" after last copied byte.)