This is a British World War I naval game. The board shows the North Sea, with England on one side and northwestern Europe from Brittany to Norway on the other. Across the North Sea lie a series of dotted lines that intersect at multiple points.
Each side has five naval bases that mark the end of a dotted line. There is a Minefield hazard dot 1-3 spaces out from each base. There also are two Mutiny dots at intersections and three Fog patches covering multiple dots around major intersections.
Each side starts moving one ship from each base. On each roll or spin, the player must move one ship that many dots forward or backward. A player captures an enemy ship or base by landing on it by exact roll. Ships in fog cannot be captured, while landing on a Minefield or Mutiny dot destroys the ship. The winner is the first to capture an enemy base.
—user summary