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Codename: ICEMAN is a naval adventure game released in 1989 for MS-DOS systems. Developed and published by Sierra On-Line, Inc., the game is presented from a third-person perspective and combines traditional point-and-click adventure mechanics with submarine simulation elements. The narrative is set in the early 21st century during a global oil crisis, focusing on a geopolitical conflict between the United States and the Soviet Union over oil reserves in Tunisia.

Players assume the role of Naval Officer Johnny Westland, who is tasked with rescuing a kidnapped US ambassador and preventing an international incident. The core gameplay involves navigating the protagonist through environments by moving in eight directions and typing text commands to examine objects, converse with characters, and solve puzzles. Interaction relies heavily on typed inputs, with specific commands like "Look" providing contextual descriptions based on the character's position. The adventure portion emphasizes realistic military procedures and first aid, where failure to follow correct protocols can lead to dead ends requiring a reload from a saved game.

A significant segment of the experience shifts to a submarine simulation, where players take direct control of a vessel to navigate and engage in combat with enemy craft. This section requires managing the submarine's systems and executing tactical maneuvers. The game structure alternates between these adventure and simulation phases as players progress through the mission, integrating puzzle-solving, exploration, and naval warfare into a single campaign.