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Black Cartridges are actually for GB mode GBC games, though a lot have SGB modesThe cartridges that have Super Gameboy enhancements are either a black cartridge that can be played in B/W or Color (Link's Awakening DX), or they will be a grey cartridge with a Super Gameboy Enhancement logo on it. (Tetris 2, anyone?)
Not all grey SGB games have the SGB logo either, I think it was mostly a Japanese thing to point out a game has SGB mode