Metal Gear wasn't the first videogame to use stealth elements such as hiding and
sneaking around; one example is Muse Software's
Castle Wolfenstein, which did this as early as 1981.
Cheating has been
around forever, whether it was
sneaking out the back door of the
castle, sending illicit love letters, talking secretly on the phone, or more recently, emailing or sexting with your partner in crime.