It was one of the four games available with the original (first) Game Boy: Shanghai, Tetris, Super Mario Land or Legend of Zelda: Link's Awakening. LoZ: LA used to give me really bad nightmares as a child. The game itself wasn't scary. I think because the dungeon bosses were called Nightmares, thinking about them before going to sleep would lead to nightmares.
The original Game Boy was a brick. It was as big as a brick, as heavy as a brick and as indestructible as a brick. I dropped it on my first day with it; it fell a metre onto concrete. No damage. I wonder if Nokia had a hand in the Game Boy's design...