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Official overview

"Kill one man, and you are a murderer. Kill millions of men, and you are a conqueror. Kill them all, and you are a god." - Jean Rostand Thoughts of a Biologist

You play the role of a military commander hidden deep within an underground bunker. Your mission - to successfully exterminate your enemy's civilian population whilst disabling their ability to attack your own. Start by launching your battleships, submarines, and bombers in order to decimate your opponent's defences. Scramble together your alliances, but remember only one can stand victorious. Prepare your pre-emptive strike before one of your supposed allies get the same idea. Choose the perfect moment for betrayal, obliterating your opponents with an apocalyptic thermonuclear barrage, but get it wrong and their devastating counter attack will bring you to your knees!

DEFCON is a hell of a ride for a strategy games fan. What can be more thrilling that a world-wide, thermonuclear conflict that wipes out all of humanity from the face of the Earth? You start slowly, deploying your forces on international waters, sneaking under the radar. Then, as the DEFCON level changes, players are allowed to use aggressive tactics and even start a conventional war. The conflict is slowly but unavoidably heating up as the game progresses and when it reaches a critical level then the ultimate weapons of mass destruction are unleashed. Let the countdown to extinction begin!

Release information

Multiplayer notice: In order to access the multiplayer you must first enter your unique cd-key that can be found under My Account.


  • manual (24 pages PDF)
  • soundtrack
   DEFCON soundtrack - 01 - Fear.mp3
   DEFCON soundtrack - 02 - Madness.mp3
   DEFCON soundtrack - 03 - Loss.mp3
  • 18 developers’ photos
  • 8 posters
  • 6 artworks

Patches and modifications

Official patches

Unofficial patches


Known issues

GOG trivia

Sale History

Price Discount Promo Date(s) [Y/M/D] Notes
$1.99 80% Supremacy Special 2014/04/25 - 2014/04/28