Fire One is a game that allows you to look through a periscope on a submarine and fire torpedoes at a fleet of a enemies various ships or the enemies submarine. As you are firing to try to destroy the fleet and submarine, an opponent (another player or the arcade) is trying to destroy your fleet or submarine at the same time. You can move your view left or right as you try to find the ships, but you can only fire eight torpedoes at a time before you wait a short delay as you reload. You can also dive underwater to protect yourself from the enemy but can't fire until you resurface. Above the main playing area there is a radar showing all the ships in the area. The winner is the first person to destroy a fleet, the opponents sub or the most points if the time runs out.