BG-gray is a background which was implemented in Powder Game ver6.2 and Powder Game 2 ver2.4. It turns all elements and the background into grayscale. Objects, and in particular players keep their original color. The background is similar to BG-air and it also uses black for normal pressure, but for low pressure a darker gray is used and for high pressure a brighter gray is used.
BG-gray can be used in pixel arts to create some gray and black colors tinges unavailible in other backgrounds.