UP & ADD'EM is a Commodore 64 game that puts players in the role of a World War 2 submarine commander in the South Pacific. The objective is to destroy Japanese convoys to support their country's war effort, and the game offers various modes for practice, campaign, and historical gameplay.
The gameplay involves navigating the submarine through treacherous waters, avoiding enemy ships and managing resources such as fuel and ammunition. Players must use strategy and skill to outmaneuver their opponents and complete missions successfully.