Are you joking? I don't know how much bit the whole graphic is with the 3d stuffs, but I know the sprites has about 10 ten colors, and they can be really easily can be stored in 8-bit (256 colors). By the way this is why sonic battle chars works in mugen without color loosing, because mugen uses 8bit colors for the sprites. Even Guilty Gear XX's sprites can be stored in 256 colors.