People often forget that there are three games in the Perfect Dark Series. The first being Perfect Dark for the Nintendo 64, Perfect Dark Zero and the oft forgotten Perfect Dark for the Gameboy Color. Unlike the console games, Perfect Dark for the Gameboy Color is played from a top down view point and is one of the few GB games that has voice acting and a rumble feature.
However Perfect Dark for the Gameboy Color is pretty terrible.
9to5 Gamer 