I enjoyed this movie quite a bit. Matthew Broderick is the teenager computer nerd who hacks into a military database through a "back door" and starts to unintentionally play games--which are, quite surprisingly, not games after all. He's really controlling the military! With WWIII nearing, the movie takes some twists and turns and it's all good fun.
Broderick is well-cast and this is probably one of the roles, along with Ferris Bueller, that stereotyped him as a continual teenager--which makes it hard for him to get adult roles nowadays. (He's in the upcoming remake of "The Producers"--yay!)
Ally Sheedy and Dabney Coleman both have supporting roles.
I thoroughly enjoyed this film and rate it a solid "4" of five stars.
Trivia note: Sheedy and Broderick both appeared in separate movies by John Hughes: "Ferris Bueller's Day Off" and "The Breakfast Club."