Nelsonic Donkey Kong Game Watch Gameplay 

Released in 1994 to promote the launch of the Game Boy version of Donkey Kong (a.k.a. Donkey Kong ‘94), this wristwatch challenges players to complete a modified version of Stage 1-7 of the aforementioned game.
To clear the level, you must collect all the items along the way. In some cases, you won’t even be allowed to move to the next part without collecting the required item. For instance, you can’t climb the first ladder without getting the hat. Don’t forget to get the key before you head for the door! To pick it up, you have to press the Down arrow (unlike the other items where you simply need to touch them to pick them up).
When you beat the level, the game will repeat, but Donkey Kong will throw barrels faster, the moving platforms will move faster, the items will blink faster, and the Goomba will move more randomly (I guess it’s supposed to be a fireball?)