The Legend of Zelda

Zelda Game & Watch (ZL-65) is a handheld LCD Zelda game made as part of Nintendo's Game & Watch Multi Screen series. It was developed by Gunpei Yokoi & Nintendo R&D1 and released on August 26, 1989 in North America. Together with the The Legend of Zelda Game Watch, it is one of two dedicated portable LCD Zelda games, and predates Link's Awakening by almost four years.

The Game & Watch Zelda is a side-scrolling action game, possibly inspired by The Adventure of Link. In total, three million Zelda Game & Watch devices were sold.

Zelda Game & Watch was the final game released in Nintendo's Game & Watch Multi Screen series. This series used two screens, and inspired the Nintendo DS. The bottom screen is used for normal battles, to show enemies' energy, to show Link's life and to show an Old Woman that sounds alarm. The top screen is used to show inventory & the map, and as an arena of boss battle.

Source: TheGamesDB