Crysis is a science fiction first-person shooter computer game developed by German company Crytek and published by Electronic Arts, and is the first game of a planned trilogy. It was released on November 13, 2007 in North America, November 15 in Australia, November 16 in Europe, November 23 in New Zealand, and November 29 in Japan. Initial NPD sales numbers were taken as a sign that the game had flopped. However, during EA's Q3 2008 Earnings Conference Call, it was stated that Crysis had sold over one million copies worldwide in the fiscal quarter and that the game continues to exceed sales expectations

Crysis is based in a fictional future where an ancient alien spacecraft has been discovered deep within the Earth. The single player campaign has the player assume the role of United States Delta Force operator Jake Dunn, referred to in-game by his call sign, Nomad. Nomad is armed with various futuristic weapons and equipment, most notably a "Nano Muscle Suit" which, according to Crytek senior game designer Bernd Diemer, was inspired by the United States' Future Force Warrior 2020 program. In Crysis, the player fights both North Korean and extraterrestrial enemies, in four different locations: a tropical island jungle, inside an "Ice Sphere" (consisting of the same jungle, but frozen), the alien ship itself (with a zero-gravity area) and a U.S. Navy aircraft carrier