The first "Zelda to go" was so popular that it was remade for the GameBoy Color launch in 1998 and re-relased as "Link's Awakening DX".
Being one of the most popular games for this handheld device, the remake sold approx. 2.2 million copies.
It was also playable with the "old" GameBoy but there was one new labyrinth exclusively playable with the GameBoy Color.Unfortunately, the Color Version has been slightly censored to remove sleazy and ambiguously scenes from the game. A detailed comparison can be found here.