Pirate combat where the cannons point sideways. That single fact is the whole game: you cannot shoot what is in front of you, so every fight is turning, waiting for the guns to bear, firing a broadside and then turning again while they reload. Sunk ships leave treasure floating, but gold only counts once it is banked at a harbor, and a full hold makes you the most attractive target on the reef. Block Ship Battle is tense in a way that straight-ahead shooting never is.