Submarine is a tactical game of World War II submarine warfare. One player assumes the role of a submarine captain while others are escort and/or convoy captains. The submarine location is kept secret and the submarine player uses plotted movement and firing (torpedoes). The escort/convoy players move their ships on the board. The game includes rules for different nationalities, various anti-submarine warfare systems, historical scenarios, night-fighting, and Design Your Own scenarios.Avalon Hill Complexity rating - 8 - BoardGameGeek