688 Attack Sub for Sega Genesis is a submarine simulation video game belonging to the simulation genre. Players command a nuclear-powered Los Angeles-class or a Soviet Alfa class submarine in various cold war scenarios, navigating through depths of the ocean to complete missions. The game emphasizes realism and strategy, requiring players to manage sonar, weapons, and propulsion systems to outmaneuver and outfight enemy subs and surface fleets. It offers both single-player missions and a two-player mode for competitive submarine warfare, delivering a blend of tactical planning and real-time action.