The Legend of Zelda: Oracle of Ages was released as a twin title with The Legend of Zelda: Oracle of Seasons for the Game Boy Color in 2001.
Both games were developed simultaneously by Flagship (a division of Capcom) and both games are essentially companion pieces that can be played separately, or linked, so that what you do in one affects what happens in the other.
Continue reading The Legend of Zelda: Oracle of Ages, Game Boy Color