This BG is exclusive to the Big Bruty stage included in the Sega CD version. The archive includes if you're interested:
-One .map16 file as the BG does consume over a Map16 page.
-Palette is easy to edit and the BG uses palette 3 and you can edit the back area color. A .palmask file is included.
-BG uses all BG1, BG2, BG3 and almost half of FG2. There's room for FG.
-Included sample level with BG,