Plot hole: McKittrick says the computer will not accept the launch codes unless they are at DEFCON 1. At the end of the climax the computer is trying to guess the code while they are at DEFCON 1. So why couldn't they just go back to a different DEFCON before the correct code was guessed?
WarGames (1983)
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Directed by: John Badham
Starring: Matthew Broderick, Dabney Coleman, John Wood, Ally Sheedy
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More mistakes in WarGames
David Lightman: [On the computer] Hello, are you still playing the game?
Joshua: Of course. I should reach Defcon 1 and release my missiles in 28 hours. Would you like to see some projected kill ratios?
David Lightman: Sixty-nine percent of the housing destroyed. Seventy-two million people dead. [Types into computer] Is this a game or is it real?
Joshua: What's the difference?
Trivia: A very early reference to computer "firewalls" is mentioned in this film.
Question: How could WOPR not know the difference between a game and real life?
Answer: While merely speculation, the WOPR is not alive and knows only what it's been programmed to do. It would have no concept of life or death, and as such would see no difference between the simulation and the real thing. That being said, an easy way to make it see the difference would be to program it to not waste physical resources. It would then see the use of all its actual warheads as less desirable.