Blockade

Blockade is a 1-player arcade game for the BBC Micro.

As a submarine captain patrolling off an enemy coast, the player's goal is to prevent incoming ships from reaching port with their cargo of weapons, fuel, and food. Played from the perspective of the submarine's periscope, the vessel is armed with six torpedoes to try to destroy enemy shipping. As an enemy ship crosses the screen, the player must adjust their fire to try to sink the vessel. After each torpedo is fired, the player receives a report of their activity, and the player can only use one torpedo per ship. There are three levels of difficulty.