DOS

Guardians of Infinity: To Save Kennedy

Trivia

Packaged with the game is an exceptionally well-researched manual detailing the whereabouts of everyone connected with the Kennedy assassination in the weeks leading up to the shooting. It's the perfect off-disk copy protection: Looking up the info is directly related to the gameplay, and you can't win the game without it, because you won't know where to send your agents to meet a particular person at a particular time.