Shot evil aliens.

Donkey Kong
Jump barrels to save the girl.

Donkey Kong Jr
Save Donkey Kong from his cage.

Get your frogs home by crossing a busy road and a river with alligators.

Eat lines and stay away from the ghosts.

Ultima II: The Revenge of the Enchantress
This is a grind style of game and to move forward in the game you need gold and you get it from killing things. You use the gold to buy better stats so you can buy better weapons and armor. With it you can kill things faster so you buy food and hit points. You keep killing things until you finally get a boat. Not that it change the game, but now you can use the Fire key instead of the Attack key for killing things. That's the amount of fun this game contains.