BG-Line is a background effect in Powder Game and Powder Game 2 that is similar to BG-air, except that BG-line has lines that show the direction of wind if it is present. It is the default BG upon starting the game, instead of the more likely BG-non. BG-line was the first background to be released in Powder Game in ver1.0, but it was not until ver 2.3 that is was called BG-line. Before that, it was simply the only background available.