The Legend of Zelda Game Watch

The Legend of Zelda Game Watch is a multi-purpose wristwatch produced by Nelsonic based on the original The Legend of Zelda and included such familiar foes as Aquamentus and Keese. However, it was considered the poorer of the two LCD games in that the screen was too small to reasonably allow much strategy or movement. The playing area was even smaller than that of the Game Boy titles in the series.

It came in black (shown), red, white, and the unusual choice of pink, which eBay sellers claim is rarer than the others.

The game consists of eight dungeons with four rooms each. In each room, Link has to collect a sword and/or a boomerang to beat his foes. As a reward, he gains a key to the next room. Though when entering it, he loses his found items and has to recollect them. The last two rooms of every dungeon also had hearts to replenish Link's health. Once all the enemies in the fourth room were dealt with, the dungeon's boss (which was always Aquamentus) appeared. To defeat him, Link had to collect a bomb and place it in front of Aquamentus. Following his victory, a Triforce fragment appears, allowing him access to the next dungeon.