CIA is a single-player adventure game in which players navigate through a text-based environment by entering two-word commands to explore surroundings and gather clues. In this game, players work for the CIA to recover a stolen ruby used in a top-secret laser project, which has been taken by a spy ring called Chaos, and the ruby is believed to still be nearby. It stands out with its interactive text commands, espionage theme, and the challenge of avoiding capture by the spy ring while solving puzzles to locate the valuable ruby.